{"id":15660,"date":"2024-01-15T06:29:13","date_gmt":"2024-01-15T02:59:13","guid":{"rendered":"https:\/\/rasanegar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/"},"modified":"2024-01-15T06:29:13","modified_gmt":"2024-01-15T02:59:13","slug":"%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa","status":"publish","type":"post","link":"https:\/\/rasanegaar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/","title":{"rendered":"\u06a9\u0627\u0631 \u0628\u0627 \u062a\u0648\u0627\u0628\u0639 \u0631\u0634\u062a\u0647 \u0627\u06cc \u062f\u0627\u062e\u0644\u06cc \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0647\u0646\u06af\u0627\u0645 \u06a9\u0627\u0631 \u0628\u0627 \u0647\u0631 \u0632\u0628\u0627\u0646 \u0628\u0631\u0646\u0627\u0645\u0647 \u0646\u0648\u06cc\u0633\u06cc\u060c \u0627\u062d\u062a\u0645\u0627\u0644\u0627\u064b \u0628\u0647 \u0628\u0631\u062e\u06cc \u0627\u0632 \u0639\u0645\u0644\u06a9\u0631\u062f\u0647\u0627 \u0646\u06cc\u0627\u0632 \u062e\u0648\u0627\u0647\u06cc\u062f \u062f\u0627\u0634\u062a \u06a9\u0647 \u0628\u0647 \u0637\u0648\u0631 \u0628\u0648\u0645\u06cc \u0628\u0627 \u0622\u0646 \u0632\u0628\u0627\u0646 \u0627\u062f\u063a\u0627\u0645 \u0646\u0634\u062f\u0647 \u0628\u0627\u0634\u0646\u062f.  \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646\u060c \u06cc\u0627 \u062e\u0648\u062f\u062a\u0627\u0646 \u0622\u0646\u0647\u0627 \u0631\u0627 \u067e\u06cc\u0627\u062f\u0647 \u0633\u0627\u0632\u06cc \u0645\u06cc \u06a9\u0646\u06cc\u062f\u060c \u06cc\u0627 \u0628\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0645\u0627\u0698\u0648\u0644 \u0647\u0627 \u06cc\u0627 \u06a9\u062a\u0627\u0628\u062e\u0627\u0646\u0647 \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u0631\u0648\u06cc \u0645\u06cc \u0622\u0648\u0631\u06cc\u062f.  \u0627\u06cc\u0646 \u0628\u0647 \u0637\u0648\u0631 \u0645\u0633\u062a\u0642\u06cc\u0645 \u0628\u0631 \u06a9\u0627\u0631\u0627\u06cc\u06cc \u0628\u0631\u0646\u0627\u0645\u0647 \u0634\u0645\u0627 \u062a\u0623\u062b\u06cc\u0631 \u0645\u06cc \u06af\u0630\u0627\u0631\u062f (\u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u062d\u0627\u0641\u0638\u0647 \u0628\u06cc\u0634\u062a\u0631\u060c \u062f\u0631\u062e\u0648\u0627\u0633\u062a \u0647\u0627\u06cc HTTP \u0628\u06cc\u0634\u062a\u0631 \u0648 \u063a\u06cc\u0631\u0647).  \u0628\u0631\u0627\u06cc \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc&#8230;"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0633\u0631\u0641\u0635\u0644\u0647\u0627\u06cc \u0645\u0637\u0644\u0628<\/p>\n<\/div><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/rasanegaar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/#%d9%85%d8%b9%d8%b1%d9%81%db%8c\" >\u0645\u0639\u0631\u0641\u06cc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/rasanegaar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/#%d8%a7%d9%86%d9%88%d8%a7%d8%b9_%d8%af%d8%a7%d8%af%d9%87_%d9%87%d8%a7%d8%8c_%d8%b3%d8%a7%d8%ae%d8%aa%d8%a7%d8%b1%d9%87%d8%a7_%d9%88_%d8%a7%d8%b4%db%8c%d8%a7%d8%a1_%d8%ac%d8%a7%d9%88%d8%a7_%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa_%d8%a8%d8%a7_%d8%aa%d9%88%d8%a7%d8%a8%d8%b9_%d8%af%d8%a7%d8%ae%d9%84%db%8c\" >\u0627\u0646\u0648\u0627\u0639 \u062f\u0627\u062f\u0647 \u0647\u0627\u060c \u0633\u0627\u062e\u062a\u0627\u0631\u0647\u0627 \u0648 \u0627\u0634\u06cc\u0627\u0621 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0628\u0627 \u062a\u0648\u0627\u0628\u0639 \u062f\u0627\u062e\u0644\u06cc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/rasanegaar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/#%d8%aa%d9%88%d8%a7%d8%a8%d8%b9_%d8%b1%d8%b4%d8%aa%d9%87_%d8%a7%db%8c_%d8%af%d8%a7%d8%ae%d9%84%db%8c_%d8%af%d8%b1_%d8%ac%d8%a7%d9%88%d8%a7_%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\" >\u062a\u0648\u0627\u0628\u0639 \u0631\u0634\u062a\u0647 \u0627\u06cc \u062f\u0627\u062e\u0644\u06cc \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/rasanegaar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/#tostring\" >toString()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/rasanegaar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/#concat\" >concat()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/rasanegaar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/#tolocaleuppercase_%d9%88_touppercase\" >toLocaleUpperCase() \u0648 toUpperCase()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/rasanegaar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/#tolocalelowercase_%d9%88_tolowercase\" >toLocaleLowerCase() \u0648 toLowerCase()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/rasanegaar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/#%d8%b2%db%8c%d8%b1_%d8%b1%d8%b4%d8%aa%d9%87\" >\u0632\u06cc\u0631 \u0631\u0634\u062a\u0647 ()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/rasanegaar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/#substr_%d8%b4%d8%b1%d9%88%d8%b9%d8%8c_%d8%b7%d9%88%d9%84\" >substr (\u0634\u0631\u0648\u0639\u060c \u0637\u0648\u0644)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/rasanegaar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/#%d8%b4%da%a9%d8%a7%d9%81\" >\u0634\u06a9\u0627\u0641()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/rasanegaar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/#charat_%d9%88_%d8%b1%d8%b4%d8%aa%d9%87_%d8%b4%d8%a7%d8%ae%d8%b5\" >charAt() \u0648 \u0631\u0634\u062a\u0647 (\u0634\u0627\u062e\u0635)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/rasanegaar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/#indexof\" >indexOf()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/rasanegaar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/#lastindexof\" >lastIndexOf()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/rasanegaar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/#%d8%ac%d8%b3%d8%aa%d8%ac%d9%88_%da%a9%d8%b1%d8%af%d9%86\" >\u062c\u0633\u062a\u062c\u0648 \u06a9\u0631\u062f\u0646()<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/rasanegaar.com\/blog\/%da%a9%d8%a7%d8%b1-%d8%a8%d8%a7-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%b1%d8%b4%d8%aa%d9%87-%d8%a7%db%8c-%d8%af%d8%a7%d8%ae%d9%84%db%8c-%d8%ac%d8%a7%d9%88%d8%a7-%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\/#%d9%86%d8%aa%db%8c%d8%ac%d9%87\" >\u0646\u062a\u06cc\u062c\u0647<\/a><\/li><\/ul><\/nav><\/div>\n<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">\u0632\u0645\u0627\u0646 \u0644\u0627\u0632\u0645 \u0628\u0631\u0627\u06cc \u0645\u0637\u0627\u0644\u0639\u0647: <\/span> <span class=\"rt-time\"> 8<\/span> <span class=\"rt-label rt-postfix\">\u062f\u0642\u06cc\u0642\u0647<\/span><\/span><p> <br \/>\n<\/p>\n<div class=\"content\"><noscript><\/p>\n<style>.lazyload-placeholder { display: none;  }<\/style>\n<p><\/noscript><\/p>\n<h2 id=\"introduction\"><span class=\"ez-toc-section\" id=\"%d9%85%d8%b9%d8%b1%d9%81%db%8c\"><\/span>\u0645\u0639\u0631\u0641\u06cc<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0647\u0646\u06af\u0627\u0645 \u06a9\u0627\u0631 \u0628\u0627 \u0647\u0631 \u0632\u0628\u0627\u0646 \u0628\u0631\u0646\u0627\u0645\u0647 \u0646\u0648\u06cc\u0633\u06cc\u060c \u0627\u062d\u062a\u0645\u0627\u0644\u0627\u064b \u0628\u0647 \u0628\u0631\u062e\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f\u0647\u0627 \u0646\u06cc\u0627\u0632 \u062e\u0648\u0627\u0647\u06cc\u062f \u062f\u0627\u0634\u062a \u06a9\u0647 \u0628\u0647 \u0637\u0648\u0631 \u0628\u0648\u0645\u06cc \u0628\u0627 \u0622\u0646 \u0632\u0628\u0627\u0646 \u0627\u062f\u063a\u0627\u0645 \u0646\u0634\u062f\u0647 \u0628\u0627\u0634\u062f.  \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646\u060c \u06cc\u0627 \u062e\u0648\u062f\u062a\u0627\u0646 \u0622\u0646\u0647\u0627 \u0631\u0627 \u067e\u06cc\u0627\u062f\u0647 \u0633\u0627\u0632\u06cc \u0645\u06cc \u06a9\u0646\u06cc\u062f\u060c \u06cc\u0627 \u0628\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0645\u0627\u0698\u0648\u0644 \u0647\u0627 \u06cc\u0627 \u06a9\u062a\u0627\u0628\u062e\u0627\u0646\u0647 \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u0631\u0648\u06cc \u0645\u06cc \u0622\u0648\u0631\u06cc\u062f.<\/p>\n<p>\u0627\u06cc\u0646 \u0628\u0647 \u0637\u0648\u0631 \u0645\u0633\u062a\u0642\u06cc\u0645 \u0628\u0631 \u06a9\u0627\u0631\u0627\u06cc\u06cc \u0628\u0631\u0646\u0627\u0645\u0647 \u0634\u0645\u0627 \u062a\u0623\u062b\u06cc\u0631 \u0645\u06cc \u06af\u0630\u0627\u0631\u062f (\u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u062d\u0627\u0641\u0638\u0647 \u0628\u06cc\u0634\u062a\u0631\u060c \u062f\u0631\u062e\u0648\u0627\u0633\u062a \u0647\u0627\u06cc HTTP \u0628\u06cc\u0634\u062a\u0631 \u0648 \u063a\u06cc\u0631\u0647).  \u0628\u0631\u0627\u06cc \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc \u0627\u0632 \u0627\u06cc\u0646\u060c \u062a\u0648\u0633\u0639\u0647 \u062f\u0647\u0646\u062f\u06af\u0627\u0646 \u06a9\u0627\u0631 \u0645\u06cc \u06a9\u0646\u0646\u062f \u0631\u0648\u06cc \u0632\u0628\u0627\u0646 \u0647\u0627\u06cc \u0628\u0631\u0646\u0627\u0645\u0647 \u0646\u0648\u06cc\u0633\u06cc \u067e\u06cc\u0634\u0631\u0641\u062a\u0647 \u062f\u0627\u0631\u0627\u06cc \u062a\u0648\u0627\u0628\u0639 \u06cc\u06a9\u067e\u0627\u0631\u0686\u0647 \u062f\u0631 \u062f\u0627\u062e\u0644 \u0632\u0628\u0627\u0646 \u0647\u0627 \u0647\u0633\u062a\u0646\u062f \u062a\u0627 \u0627\u0632 \u0646\u06cc\u0627\u0632 \u0628\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u06a9\u062a\u0627\u0628\u062e\u0627\u0646\u0647 \u0647\u0627\u06cc \u062e\u0627\u0631\u062c\u06cc \u0628\u0631\u0627\u06cc \u06a9\u0627\u0631\u0647\u0627\u06cc \u0631\u0627\u06cc\u062c \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc \u06a9\u0646\u0646\u062f.<\/p>\n<p>\u0622\u0634\u0646\u0627\u06cc\u06cc \u0628\u0627 \u0627\u06cc\u0646 \u062a\u0648\u0627\u0628\u0639 \u062f\u0627\u062e\u0644\u06cc \u062f\u0631 \u0646\u0638\u0631 \u06af\u0631\u0641\u062a\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a <em>\u062f\u0627\u0646\u0634 \u0628\u0646\u06cc\u0627\u062f\u06cc<\/em> \u0627\u0632 \u06cc\u06a9 \u0632\u0628\u0627\u0646\u060c \u0648 \u0634\u0645\u0627 \u0647\u0646\u0648\u0632 \u0647\u0645 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0641\u0642\u0637 \u0628\u0627 \u062a\u0648\u0627\u0628\u0639 \u062f\u0627\u062e\u0644\u06cc \u0628\u0633\u06cc\u0627\u0631 \u0641\u0627\u0635\u0644\u0647 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f.  \u0627\u0644\u0628\u062a\u0647\u060c \u0628\u0647 \u0627\u062d\u062a\u0645\u0627\u0644 \u0632\u06cc\u0627\u062f \u062f\u0631 \u0646\u0647\u0627\u06cc\u062a \u0627\u0632 \u0628\u0631\u062e\u06cc \u0645\u0627\u0698\u0648\u0644 \u0647\u0627\/\u06a9\u062a\u0627\u0628\u062e\u0627\u0646\u0647 \u0647\u0627 \u0628\u0631\u0627\u06cc \u06a9\u0627\u0631\u0647\u0627\u06cc \u062e\u0627\u0635\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u062e\u0648\u0627\u0647\u06cc\u062f \u06a9\u0631\u062f.<\/p>\n<blockquote>\n<p>\u062f\u0631 \u0627\u06cc\u0646 \u0631\u0627\u0647\u0646\u0645\u0627\u06cc \u0645\u0628\u062a\u062f\u06cc \u06af\u0631\u0627\u060c \u0646\u06af\u0627\u0647\u06cc \u0628\u0647 \u062a\u0648\u0627\u0628\u0639 \u062f\u0627\u062e\u0644\u06cc \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0645\u0631\u0628\u0648\u0637 \u0628\u0647 \u0631\u0634\u062a\u0647 \u0647\u0627 \u062e\u0648\u0627\u0647\u06cc\u0645 \u062f\u0627\u0634\u062a.<\/p>\n<\/blockquote>\n<h2 id=\"javascriptsdatatypesstructuresandobjectswithbuiltinfunctions\"><span class=\"ez-toc-section\" id=\"%d8%a7%d9%86%d9%88%d8%a7%d8%b9_%d8%af%d8%a7%d8%af%d9%87_%d9%87%d8%a7%d8%8c_%d8%b3%d8%a7%d8%ae%d8%aa%d8%a7%d8%b1%d9%87%d8%a7_%d9%88_%d8%a7%d8%b4%db%8c%d8%a7%d8%a1_%d8%ac%d8%a7%d9%88%d8%a7_%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa_%d8%a8%d8%a7_%d8%aa%d9%88%d8%a7%d8%a8%d8%b9_%d8%af%d8%a7%d8%ae%d9%84%db%8c\"><\/span>\u0627\u0646\u0648\u0627\u0639 \u062f\u0627\u062f\u0647 \u0647\u0627\u060c \u0633\u0627\u062e\u062a\u0627\u0631\u0647\u0627 \u0648 \u0627\u0634\u06cc\u0627\u0621 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0628\u0627 \u062a\u0648\u0627\u0628\u0639 \u062f\u0627\u062e\u0644\u06cc<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f <em>\u0647\u0634\u062a \u0646\u0648\u0639 \u062f\u0627\u062f\u0647<\/em>:<\/p>\n<ol>\n<li><em>\u0631\u0634\u062a\u0647<\/em><\/li>\n<li><em>\u0639\u062f\u062f<\/em><\/li>\n<li><em>\u0628\u0648\u0644\u06cc<\/em><\/li>\n<li><em>\u062e\u0627\u0644\u06cc<\/em><\/li>\n<li><em>\u062a\u0639\u0631\u06cc\u0641 \u0646\u0634\u062f\u0647<\/em><\/li>\n<li><em>\u0633\u0645\u0628\u0644<\/em><\/li>\n<li><em>BigInt<\/em><\/li>\n<li><em>\u0647\u062f\u0641 &#8211; \u0634\u06cc<\/em><\/li>\n<\/ol>\n<p>\u0628\u0627 \u0627\u06cc\u0646 \u062d\u0627\u0644\u060c \u0647\u0631 \u0646\u0648\u0639 \u062f\u0627\u062f\u0647 \u0627\u06cc \u06cc\u06a9 \u062a\u0627\u0628\u0639 \u062f\u0627\u062e\u0644\u06cc \u0646\u062f\u0627\u0631\u062f.  \u0622\u0646\u0647\u0627 \u0641\u0642\u0637 \u062a\u0639\u0631\u06cc\u0641 \u0634\u062f\u0647 \u0627\u0646\u062f \u0631\u0648\u06cc: <strong>\u0631\u0634\u062a\u0647\u060c \u0639\u062f\u062f \u0648 \u0628\u0648\u0644\u06cc<\/strong>.<\/p>\n<p>\u0648\u0642\u062a\u06cc \u0635\u062d\u0628\u062a \u0627\u0632 \u0622\u0646 \u0645\u06cc \u0634\u0648\u062f <strong>\u0633\u0627\u062e\u062a\u0627\u0631\u0647\u0627\u06cc \u062f\u0627\u062f\u0647<\/strong> \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a\u060c <em>\u0647\u0641\u062a \u0633\u0627\u0632\u0647 \u067e\u0631\u06a9\u0627\u0631\u0628\u0631\u062f<\/em> \u0647\u0633\u062a\u0646\u062f:<\/p>\n<ol>\n<li><em>\u0622\u0631\u0627\u06cc\u0647<\/em><\/li>\n<li><em>\u067e\u0634\u062a\u0647<\/em><\/li>\n<li><em>\u0635\u0641<\/em><\/li>\n<li><em>\u0644\u06cc\u0633\u062a \u067e\u06cc\u0648\u0646\u062f \u0634\u062f\u0647<\/em><\/li>\n<li><em>\u062f\u0631\u062e\u062a<\/em><\/li>\n<li><em>\u0646\u0645\u0648\u062f\u0627\u0631<\/em><\/li>\n<li><em>\u0642\u0627\u0628\u0644 \u0647\u0634\u062a\u0645 \u0634\u062f\u0646<\/em><\/li>\n<\/ol>\n<p>\u0645\u0634\u0627\u0628\u0647 \u0627\u0646\u0648\u0627\u0639 \u062f\u0627\u062f\u0647 \u0647\u0627\u060c \u062f\u0631 \u0633\u0627\u062e\u062a\u0627\u0631\u0647\u0627\u06cc \u062f\u0627\u062f\u0647\u060c \u062a\u0648\u0627\u0628\u0639 \u062f\u0627\u062e\u0644\u06cc \u0641\u0642\u0637 \u062a\u0639\u0631\u06cc\u0641 \u0645\u06cc \u0634\u0648\u0646\u062f \u0631\u0648\u06cc \u06cc\u06a9 <strong>\u0622\u0631\u0627\u06cc\u0647<\/strong>.  \u0633\u0631\u0627\u0646\u062c\u0627\u0645\u060c <strong>\u0627\u0634\u06cc\u0627\u0621<\/strong> \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0646\u06cc\u0632 \u062a\u0648\u0627\u0628\u0639 \u062f\u0627\u062e\u0644\u06cc \u0645\u0627\u0646\u0646\u062f <strong>\u062a\u0627\u0631\u06cc\u062e\u060c RegExp \u0648 \u0631\u06cc\u0627\u0636\u06cc<\/strong>.<\/p>\n<p>\u062f\u0631 \u0627\u06cc\u0646 \u0631\u0627\u0647\u0646\u0645\u0627\u060c \u0645\u0627 \u062a\u0645\u0631\u06a9\u0632 \u062e\u0648\u0627\u0647\u06cc\u0645 \u06a9\u0631\u062f \u0631\u0648\u06cc \u0631\u0634\u062a\u0647 \u0647\u0627 \u0628\u0647 \u0637\u0648\u0631 \u062e\u0627\u0635<\/p>\n<h2 id=\"builtinstringfunctionsinjavascript\"><span class=\"ez-toc-section\" id=\"%d8%aa%d9%88%d8%a7%d8%a8%d8%b9_%d8%b1%d8%b4%d8%aa%d9%87_%d8%a7%db%8c_%d8%af%d8%a7%d8%ae%d9%84%db%8c_%d8%af%d8%b1_%d8%ac%d8%a7%d9%88%d8%a7_%d8%a7%d8%b3%da%a9%d8%b1%db%8c%d9%be%d8%aa\"><\/span>\u062a\u0648\u0627\u0628\u0639 \u0631\u0634\u062a\u0647 \u0627\u06cc \u062f\u0627\u062e\u0644\u06cc \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0622 <strong>\u0631\u0634\u062a\u0647<\/strong> \u0647\u0645\u0627\u0646\u0637\u0648\u0631 \u06a9\u0647 \u0642\u0628\u0644\u0627 \u0630\u06a9\u0631 \u0634\u062f \u06cc\u06a9\u06cc \u0627\u0632 \u0647\u0634\u062a \u0646\u0648\u0639 \u062f\u0627\u062f\u0647 \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0627\u0633\u062a.  \u062f\u0631 \u0627\u0635\u0644 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u06cc\u06a9 <em>\u0622\u0631\u0627\u06cc\u0647 (\u0631\u0634\u062a\u0647) \u06a9\u0627\u0631\u0627\u06a9\u062a\u0631\u0647\u0627<\/em>.<\/p>\n<p>\u0639\u0644\u0627\u0648\u0647 \u0628\u0631 \u0627\u06cc\u0646\u060c \u0634\u0627\u06cc\u0627\u0646 \u0630\u06a9\u0631 \u0627\u0633\u062a \u06a9\u0647 \u0631\u0634\u062a\u0647 \u0647\u0627 \u0647\u0633\u062a\u0646\u062f <strong>\u062a\u063a\u06cc\u06cc\u0631\u0646\u0627\u067e\u0630\u06cc\u0631<\/strong> &#8211; \u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u06cc\u06a9 \u0634\u06cc \u0631\u0634\u062a\u0647 \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc \u0634\u0648\u062f\u060c \u0646\u0645\u06cc \u062a\u0648\u0627\u0646 \u0622\u0646 \u0631\u0627 \u062a\u063a\u06cc\u06cc\u0631 \u062f\u0627\u062f.  \u0647\u0631 \u062a\u0648\u0627\u0628\u0639\u06cc \u06a9\u0647 \u0631\u0634\u062a\u0647 \u0631\u0627 \u062a\u063a\u06cc\u06cc\u0631 \u0645\u06cc \u062f\u0647\u062f\u060c a \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc \u06a9\u0646\u062f <em>\u0634\u06cc \u0631\u0634\u062a\u0647 \u062c\u062f\u06cc\u062f<\/em> \u0648 \u0628\u0647 \u062c\u0627\u06cc \u062a\u063a\u06cc\u06cc\u0631 \u0646\u0633\u062e\u0647 \u0627\u0635\u0644\u06cc\u060c \u0622\u0646 \u0631\u0627 \u0628\u0631\u06af\u0631\u062f\u0627\u0646\u06cc\u062f.<\/p>\n<p>\u0628\u0627 \u062a\u0648\u062c\u0647 \u0628\u0647 \u0627\u06cc\u0646 \u0648\u0627\u0642\u0639\u06cc\u062a \u06a9\u0647 \u0631\u0634\u062a\u0647 \u0647\u0627 \u0641\u0642\u0637 \u0622\u0631\u0627\u06cc\u0647 \u0647\u0633\u062a\u0646\u062f &#8211; \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0622\u0646\u0647\u0627 \u0631\u0627 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0622\u0631\u0627\u06cc\u0647 \u062f\u0631 \u0646\u0638\u0631 \u0628\u06af\u06cc\u0631\u06cc\u062f \u0648 \u0639\u0646\u0627\u0635\u0631 \u0631\u0627 \u0627\u0632 \u0637\u0631\u06cc\u0642 <code>array(index)<\/code> \u0646\u0634\u0627\u0646\u0647 \u06af\u0630\u0627\u0631\u06cc.<\/p>\n<p>\u0647\u0645\u0627\u0646\u0637\u0648\u0631 \u06a9\u0647 \u06af\u0641\u062a\u0647 \u0634\u062f\u060c \u0627\u062c\u0627\u0632\u0647 \u062f\u0647\u06cc\u062f \u0628\u0627 \u062a\u0648\u0627\u0628\u0639 \u062f\u0627\u062e\u0644\u06cc \u0645\u0631\u0628\u0648\u0637 \u0628\u0647 \u0631\u0634\u062a\u0647 \u0647\u0627 \u0634\u0631\u0648\u0639 \u06a9\u0646\u06cc\u0645.<\/p>\n<h3 id=\"tostring\"><span class=\"ez-toc-section\" id=\"tostring\"><\/span><em>toString()<\/em><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><code>toString()<\/code>  \u06cc\u06a9\u06cc \u0627\u0632 \u0645\u062a\u062f\u0627\u0648\u0644 \u062a\u0631\u06cc\u0646 \u062a\u0648\u0627\u0628\u0639 \u0645\u0648\u0631\u062f \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u062f\u0631 \u0631\u0634\u062a\u0647 \u0647\u0627 \u0627\u0633\u062a.  \u0645\u062a\u0639\u0644\u0642 \u0628\u0647 <em>\u0647\u0645\u0647<\/em> <code>Object<\/code>s \u0648 \u06cc\u06a9 \u0646\u0645\u0627\u06cc\u0634 \u0631\u0634\u062a\u0647 \u0627\u06cc \u0627\u0632 \u0634\u06cc \u0631\u0627 \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f \u0648 \u0628\u0647 \u0637\u0648\u0631 \u0645\u0648\u062b\u0631 \u06cc\u06a9 \u0634\u06cc \u0627\u0632 \u0647\u0631 \u0646\u0648\u0639 \u0631\u0627 \u0628\u0647 \u0646\u0645\u0627\u06cc\u0634 \u0631\u0634\u062a\u0647 \u062e\u0648\u062f \u062a\u0628\u062f\u06cc\u0644 \u0645\u06cc \u06a9\u0646\u062f:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-number\">100<\/span>;\n<span class=\"hljs-built_in\">console<\/span>.log(x.toString()); <span class=\"hljs-comment\">\/\/ Output: 100<\/span>\n<\/code><\/pre>\n<p><code>toString()<\/code>  \u0628\u0633\u062a\u0647 \u0628\u0647 \u0647\u0631 \u0634\u06cc \u0645\u062a\u0641\u0627\u0648\u062a \u0631\u0641\u062a\u0627\u0631 \u062e\u0648\u0627\u0647\u062f \u06a9\u0631\u062f \u0631\u0648\u06cc \u0627\u062c\u0631\u0627\u06cc \u062a\u0627\u0628\u0639 &#8211; \u0645\u0639\u0646\u06cc \u0646\u0645\u0627\u06cc\u0634 \u0622\u0646 \u0634\u06cc \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u0627\u0633\u062a.  \u0639\u0644\u0627\u0648\u0647 \u0628\u0631 \u0627\u06cc\u0646\u060c \u062a\u0648\u062c\u0647 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f \u06a9\u0647 \u0627\u06af\u0631 \u0647\u0631 \u0639\u0646\u0635\u0631\u06cc \u0631\u0627 \u062f\u0631 \u06cc\u06a9 \u0639\u0645\u0644\u06cc\u0627\u062a \u062d\u0633\u0627\u0628\u06cc \u0628\u0647 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062a\u063a\u06cc\u06cc\u0631 \u062f\u0647\u06cc\u062f &#8211; \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0627\u06cc\u0646 \u0631\u0627 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u062a\u0644\u0627\u0634\u06cc \u0628\u0631\u0627\u06cc <strong>\u0627\u0644\u062d\u0627\u0642<\/strong>:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-number\">100<\/span>;\n<span class=\"hljs-keyword\">let<\/span> y = <span class=\"hljs-number\">200<\/span>;\n   \n<span class=\"hljs-keyword\">let<\/span> z1 = x+y;\n<span class=\"hljs-keyword\">let<\/span> z2 = x.toString() + y;\n   \n<span class=\"hljs-built_in\">console<\/span>.log(z1); <span class=\"hljs-comment\">\/\/ Output: 300 <\/span>\n<span class=\"hljs-built_in\">console<\/span>.log(z2); <span class=\"hljs-comment\">\/\/ Output: 100200<\/span>\n<\/code><\/pre>\n<p>\u0627\u06cc\u0646\u062c\u0627\u060c <code>z1<\/code> \u0627\u0632 \u0646\u0648\u0639 \u0627\u0633\u062a <em>\u0639\u062f\u062f<\/em> \u0627\u0632 \u0622\u0646\u062c\u0627\u06cc\u06cc \u06a9\u0647 \u0645\u0627 \u0628\u0647 \u0645\u062a\u063a\u06cc\u0631\u0647\u0627\u06cc \u0646\u0648\u0639 \u0627\u0636\u0627\u0641\u0647 \u0645\u06cc \u06a9\u0646\u06cc\u0645 <em>\u0639\u062f\u062f<\/em> \u0628\u0627 \u0647\u0645 \u0648 <code>z2<\/code> \u0627\u0632 \u0646\u0648\u0639 \u0627\u0633\u062a <em>\u0631\u0634\u062a\u0647<\/em> \u0686\u0648\u0646 \u0627\u0648\u0644\u06cc\u0646 \u0645\u062a\u063a\u06cc\u0631 \u0627\u0632 \u0646\u0648\u0639 \u0627\u0633\u062a <em>\u0631\u0634\u062a\u0647<\/em> \u0648 <code>y<\/code> \u062f\u0631 \u062d\u0627\u0644 \u062a\u0628\u062f\u06cc\u0644 \u062f\u0627\u062e\u0644\u06cc \u0628\u0647 <em>\u0631\u0634\u062a\u0647<\/em> \u0648 \u0636\u0645\u06cc\u0645\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a <code>x<\/code>.  \u0627\u06af\u0631 \u0645\u06cc \u062e\u0648\u0627\u0647\u06cc\u062f \u06cc\u06a9 \u0646\u062a\u06cc\u062c\u0647 \u062d\u0633\u0627\u0628\u06cc \u0631\u0627 \u0628\u0647 \u0631\u0634\u062a\u0647 \u062a\u0628\u062f\u06cc\u0644 \u06a9\u0646\u06cc\u062f &#8211; \u0645\u0637\u0645\u0626\u0646 \u0634\u0648\u06cc\u062f \u06a9\u0647 \u062a\u0628\u062f\u06cc\u0644 \u0631\u0627 \u0627\u0646\u062c\u0627\u0645 \u062f\u0647\u06cc\u062f <strong>\u062f\u0631 \u067e\u0627\u06cc\u0627\u0646<\/strong>.<\/p>\n<h3 id=\"concat\"><span class=\"ez-toc-section\" id=\"concat\"><\/span><em>concat()<\/em><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><code>concat()<\/code>  \u062f\u0648 \u0631\u0634\u062a\u0647 \u0631\u0627 \u0628\u0647 \u0647\u0645 \u0627\u0636\u0627\u0641\u0647 \u0645\u06cc \u06a9\u0646\u062f \u0648 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062c\u062f\u06cc\u062f \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"some \"<\/span>;\n<span class=\"hljs-keyword\">let<\/span> y = <span class=\"hljs-string\">\"string\"<\/span>;\n   \n<span class=\"hljs-built_in\">console<\/span>.log(x.concat(y)); <span class=\"hljs-comment\">\/\/ Output: some string<\/span>\n<\/code><\/pre>\n<p>\u0627\u0633\u0627\u0633\u0627\u064b \u0647\u0645\u0627\u0646 \u0639\u0645\u0644\u06cc\u0627\u062a \u0632\u06cc\u0631 \u0631\u0627 \u0627\u0646\u062c\u0627\u0645 \u0645\u06cc \u062f\u0647\u062f:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"some\"<\/span>;\n<span class=\"hljs-keyword\">let<\/span> y = <span class=\"hljs-string\">\"string\"<\/span>;\n   \n<span class=\"hljs-built_in\">console<\/span>.log(x+y); <span class=\"hljs-comment\">\/\/ Output: some string<\/span>\n<\/code><\/pre>\n<p>\u062f\u0631 \u0648\u0627\u0642\u0639 \u062a\u0648\u0635\u06cc\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a <strong>\u0628\u0631\u0627\u06cc \u062a\u0631\u062c\u06cc\u062d \u062f\u0627\u062f\u0646 <code>concat()<\/code> \u062a\u0627\u0628\u0639 \u0628\u0647 \u062c\u0627\u06cc \u0639\u0645\u0644\u0648\u0646\u062f\u0647\u0627<\/strong>\u060c \u0628\u0647 \u062f\u0644\u06cc\u0644 \u0645\u0632\u0627\u06cc\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f.  \u0628\u0627 \u0627\u06cc\u0646 \u062d\u0627\u0644\u060c \u0627\u0632 \u0628\u0647 \u0647\u0645 \u067e\u06cc\u0648\u0633\u062a\u0646 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u0633\u0648\u062f \u0632\u06cc\u0627\u062f\u06cc \u0646\u062e\u0648\u0627\u0647\u06cc\u062f \u062f\u0627\u0634\u062a &#8211; \u0628\u0647 \u062f\u0633\u062a \u062e\u0648\u0627\u0647\u06cc\u062f \u0622\u0648\u0631\u062f \u0631\u0648\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f \u0628\u0631\u0627\u06cc \u062a\u0639\u062f\u0627\u062f \u0632\u06cc\u0627\u062f\u06cc \u0631\u0634\u062a\u0647  \u0628\u06cc\u0627\u06cc\u06cc\u062f \u0628\u0647 \u0633\u0631\u0639\u062a \u0622\u0646 \u0631\u0627 \u0645\u062d\u06a9 \u0628\u0632\u0646\u06cc\u0645:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-built_in\">console<\/span>.time(<span class=\"hljs-string\">'Concatenating with Operator'<\/span>);\nconcatWithOperator();\n<span class=\"hljs-built_in\">console<\/span>.timeEnd(<span class=\"hljs-string\">'Concatenating with Operator'<\/span>);\n\n<span class=\"hljs-built_in\">console<\/span>.time(<span class=\"hljs-string\">'Concatenating with Function'<\/span>);\nconcatWithFunction();\n<span class=\"hljs-built_in\">console<\/span>.timeEnd(<span class=\"hljs-string\">'Concatenating with Function'<\/span>);\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">concatWithOperator<\/span>(<span class=\"hljs-params\"><\/span>) <\/span>{\n    <span class=\"hljs-keyword\">let<\/span> result = <span class=\"hljs-string\">\"\"<\/span>;\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-keyword\">let<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; <span class=\"hljs-number\">10000<\/span>; i++) {\n      result = result += i;\n    }\n}\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">concatWithFunction<\/span>(<span class=\"hljs-params\"><\/span>) <\/span>{\n    <span class=\"hljs-keyword\">let<\/span> result = <span class=\"hljs-string\">\"\"<\/span>;\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-keyword\">let<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; <span class=\"hljs-number\">10000<\/span>; i++) {\n      result = result.concat(i);\n    }\n}\n<\/code><\/pre>\n<p>\u0627\u06cc\u0646 \u0646\u062a\u06cc\u062c\u0647 \u062f\u0631:<\/p>\n<pre><code class=\"hljs\">Concatenating with Operator: 3.232ms\nConcatenating with Function: 1.509ms\n<\/code><\/pre>\n<p>\u0639\u0645\u0644\u06a9\u0631\u062f \u062a\u0642\u0631\u06cc\u0628\u0627 \u062f\u0648 \u0628\u0631\u0627\u0628\u0631 \u0633\u0631\u06cc\u0639\u062a\u0631 \u0627\u0633\u062a \u0631\u0648\u06cc \u0627\u06cc\u0646 \u06a9\u062f  \u0647\u0645\u0686\u0646\u06cc\u0646 \u0634\u0627\u06cc\u0627\u0646 \u0630\u06a9\u0631 \u0627\u0633\u062a \u06a9\u0647 \u0628\u06cc\u0627\u0646\u06cc\u0647 \u0631\u0633\u0645\u06cc \u0627\u0632 <a target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/String\/concat\">MDN<\/a>\u060c \u062f\u0631 \u0645\u0648\u0631\u062f \u0645\u0632\u0627\u06cc\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f:<\/p>\n<blockquote>\n<p>\u0627\u06a9\u06cc\u062f\u0627\u064b \u062a\u0648\u0635\u06cc\u0647 \u0645\u06cc \u0634\u0648\u062f \u06a9\u0647 \u0627\u0632 \u0639\u0645\u0644\u06af\u0631\u0647\u0627\u06cc \u0627\u0646\u062a\u0633\u0627\u0628 (+\u060c +=) \u0628\u0647 \u062c\u0627\u06cc \u0645\u062a\u062f ()concat \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0634\u0648\u062f.<\/p>\n<\/blockquote>\n<p>\u0628\u0627 \u062a\u0648\u062c\u0647 \u0628\u0647 \u0627\u06cc\u0646 \u0648\u0627\u0642\u0639\u06cc\u062a \u06a9\u0647 \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0639\u062c\u06cc\u0628 \u0628\u0647 \u0646\u0638\u0631 \u0628\u0631\u0633\u062f <code>concat()<\/code> \u062f\u0631 \u062a\u0633\u062a \u0647\u0627 \u0627\u0632 \u0639\u0645\u0644\u06af\u0631\u0647\u0627 \u0628\u0647\u062a\u0631 \u0639\u0645\u0644 \u0645\u06cc \u06a9\u0646\u062f.  \u0686\u0647 \u0686\u06cc\u0632\u06cc \u0645\u06cc \u062f\u0647\u062f\u061f  \u062e\u0648\u0628\u060c \u0645\u062d\u06a9 \u0632\u062f\u0646 \u06a9\u062f\u0647\u0627\u06cc\u06cc \u0645\u0627\u0646\u0646\u062f \u0627\u06cc\u0646 \u0628\u0647 \u0622\u0633\u0627\u0646\u06cc \u0627\u062c\u0631\u0627\u06cc \u0622\u0646 \u0648 \u0645\u0634\u0627\u0647\u062f\u0647 \u0646\u062a\u0627\u06cc\u062c \u0646\u06cc\u0633\u062a.<\/p>\n<p>\u0645\u0631\u0648\u0631\u06af\u0631 \u0634\u0645\u0627\u060c \u0646\u0633\u062e\u0647 \u0622\u0646\u060c \u0648 \u0647\u0645\u0686\u0646\u06cc\u0646 \u0628\u0647\u06cc\u0646\u0647\u200c\u0633\u0627\u0632\u06cc\u200c\u0627\u06cc \u06a9\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc\u200c\u06a9\u0646\u062f \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0627\u0632 \u0645\u0627\u0634\u06cc\u0646\u06cc \u0628\u0647 \u0645\u0627\u0634\u06cc\u0646 \u062f\u06cc\u06af\u0631 \u0645\u062a\u0641\u0627\u0648\u062a \u0628\u0627\u0634\u062f\u060c \u0648 \u0648\u06cc\u0698\u06af\u06cc\u200c\u0647\u0627\u06cc\u06cc \u0645\u0627\u0646\u0646\u062f \u0622\u0646\u200c\u0647\u0627 \u0648\u0627\u0642\u0639\u0627 \u0628\u0631 \u0639\u0645\u0644\u06a9\u0631\u062f \u062a\u0627\u062b\u06cc\u0631 \u0645\u06cc\u200c\u06af\u0630\u0627\u0631\u0646\u062f.  \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0645\u062b\u0627\u0644\u060c \u0645\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0631\u062f\u0647 \u0627\u06cc\u0645 <strong>\u0631\u0634\u062a\u0647 \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641<\/strong> \u062f\u0631 \u0627\u0644\u062d\u0627\u0642\u060c \u0622\u0646\u0647\u0627\u06cc\u06cc \u06a9\u0647 \u0627\u0632 \u062a\u06a9\u0631\u0627\u0631 \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc \u0634\u0648\u0646\u062f.  \u0627\u06af\u0631 \u0628\u062e\u0648\u0627\u0647\u06cc\u0645 \u0627\u0632 \u0647\u0645\u0627\u0646 \u0631\u0634\u062a\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u0645\u060c \u06cc\u06a9 \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632 \u0645\u0627\u0646\u0646\u062f V8 \u06af\u0648\u06af\u0644\u060c \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0631\u0634\u062a\u0647 \u0631\u0627 \u0628\u06cc\u0634\u062a\u0631 \u0628\u0647\u06cc\u0646\u0647 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<blockquote>\n<p>\u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u06cc\u06a9 \u0642\u0627\u0639\u062f\u0647 \u06a9\u0644\u06cc &#8211; <strong>\u06a9\u062f \u062e\u0648\u062f \u0631\u0627 \u062a\u0633\u062a \u0648 \u062a\u0627\u06cc\u06cc\u062f \u06a9\u0646\u06cc\u062f<\/strong> \u0628\u0647\u200c\u062c\u0627\u06cc \u0627\u06cc\u0646\u06a9\u0647 \u062a\u0648\u0635\u06cc\u0647\u200c\u0647\u0627 \u0631\u0627 \u0628\u0647 \u0635\u0648\u0631\u062a \u0648\u0627\u0642\u0639\u06cc \u062f\u0631\u06cc\u0627\u0641\u062a \u06a9\u0646\u06cc\u062f.<\/p>\n<\/blockquote>\n<h3 id=\"tolocaleuppercaseandtouppercase\"><span class=\"ez-toc-section\" id=\"tolocaleuppercase_%d9%88_touppercase\"><\/span><em>toLocaleUpperCase()<\/em> \u0648 <em>toUpperCase()<\/em><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><code>toLocaleUpperCase()<\/code>  \u0631\u0634\u062a\u0647 \u062f\u0627\u062f\u0647 \u0634\u062f\u0647 \u0631\u0627 \u0628\u0647 \u062d\u0631\u0648\u0641 \u0628\u0632\u0631\u06af \u062a\u0628\u062f\u06cc\u0644 \u0645\u06cc \u06a9\u0646\u062f \u0648 \u0627\u0632 \u0632\u0628\u0627\u0646 \u0645\u0648\u0631\u062f \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u062a\u0628\u0639\u06cc\u062a \u0645\u06cc \u06a9\u0646\u062f \u0631\u0648\u06cc \u0645\u0627\u0634\u06cc\u0646\u06cc \u06a9\u0647 \u06a9\u062f \u0631\u0627 \u06a9\u0627\u0645\u067e\u0627\u06cc\u0644 \u0645\u06cc \u06a9\u0646\u062f  \u0639\u0644\u0627\u0648\u0647 \u0628\u0631 \u0627\u06cc\u0646\u060c \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u06cc\u062f \u0645\u062d\u0644 \u0631\u0627 \u0627\u0632 \u0637\u0631\u06cc\u0642 \u06cc\u06a9 \u0622\u0631\u06af\u0648\u0645\u0627\u0646 \u0631\u0634\u062a\u0647\u200c\u0627\u06cc \u0645\u0634\u062e\u0635 \u06a9\u0646\u06cc\u062f:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> word = <span class=\"hljs-string\">\"Stra\u00dfe\"<\/span>;\n\n<span class=\"hljs-built_in\">console<\/span>.log(word.toUpperCase()) <span class=\"hljs-comment\">\/\/ STRASSE<\/span>\n<span class=\"hljs-built_in\">console<\/span>.log(word.toLocaleUpperCase(<span class=\"hljs-string\">'de-DE'<\/span>)) <span class=\"hljs-comment\">\/\/ STRASSE<\/span>\n<\/code><\/pre>\n<blockquote>\n<p>\u062f\u0631 \u0628\u06cc\u0634\u062a\u0631 \u0645\u0648\u0627\u0631\u062f\u060c <code>toUpperCase()<\/code> \u0648 <code>toLocaleUpperCase()<\/code> \u0647\u0645\u0627\u0646 \u0646\u062a\u06cc\u062c\u0647 \u0631\u0627 \u0646\u0634\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f\u060c \u062d\u062a\u06cc \u0627\u06af\u0631 \u062a\u0639\u06cc\u06cc\u0646 \u06a9\u0646\u0646\u062f\u0647 \u0645\u062d\u0644\u06cc \u0631\u0627 \u0627\u0631\u0627\u0626\u0647 \u0646\u06a9\u0646\u06cc\u062f.  \u0641\u0642\u0637 \u0628\u0627 \u0646\u06af\u0627\u0634\u062a \u06cc\u0648\u0646\u06cc\u06a9\u062f \u063a\u06cc\u0631 \u0627\u0633\u062a\u0627\u0646\u062f\u0627\u0631\u062f\u060c \u0645\u0627\u0646\u0646\u062f \u062a\u0631\u06a9\u06cc\u060c \u0627\u0633\u062a \u06a9\u0647 <code>toLocaleUpperCase()<\/code> \u0646\u062a\u0627\u06cc\u062c \u0645\u062a\u0641\u0627\u0648\u062a\u06cc \u0627\u06cc\u062c\u0627\u062f \u062e\u0648\u0627\u0647\u062f \u06a9\u0631\u062f.<\/p>\n<\/blockquote>\n<h3 id=\"tolocalelowercaseandtolowercase\"><span class=\"ez-toc-section\" id=\"tolocalelowercase_%d9%88_tolowercase\"><\/span><em>toLocaleLowerCase()<\/em> \u0648 <em>toLowerCase()<\/em><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><code>toLocaleLowerCase()<\/code>  \u0639\u0645\u0644\u06a9\u0631\u062f \u062a\u0642\u0631\u06cc\u0628\u0627 \u0645\u0634\u0627\u0628\u0647\u06cc \u062f\u0627\u0631\u062f <code>toLocaleUpperCase()<\/code>\u060c \u0627\u0645\u0627 \u0631\u0634\u062a\u0647 \u0631\u0627 \u0628\u0647 \u062d\u0631\u0648\u0641 \u06a9\u0648\u0686\u06a9 \u062a\u0628\u062f\u06cc\u0644 \u0645\u06cc \u06a9\u0646\u062f.  \u0628\u0647 \u0647\u0645\u06cc\u0646 \u062a\u0631\u062a\u06cc\u0628\u060c <code>toLowerCase()<\/code> \u0645\u0648\u0636\u0639\u06cc-\u0622\u06af\u0646\u0648\u0633\u062a\u06cc\u06a9 \u0627\u0633\u062a.  \u0628\u0627 \u0627\u06cc\u0646 \u062d\u0627\u0644\u060c \u0622\u06af\u0627\u0647 \u0628\u0627\u0634\u06cc\u062f \u06a9\u0647 \u0627\u0637\u0644\u0627\u0639\u0627\u062a \u062e\u0627\u0635 <strong>\u06af\u0645 \u0634\u062f\u0647 \u0627\u0633\u062a<\/strong> \u0647\u0646\u06af\u0627\u0645 \u062a\u0628\u062f\u06cc\u0644 \u0628\u06cc\u0646 \u062d\u0631\u0648\u0641 \u0628\u0632\u0631\u06af \u0648 \u06a9\u0648\u0686\u06a9.<\/p>\n<p>\u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0645\u062b\u0627\u0644\u060c \u0627\u06af\u0631 \u062a\u0628\u062f\u06cc\u0644 \u06a9\u0646\u06cc\u0645 <code>'Stra\u00dfe'<\/code> \u0628\u0647 \u062d\u0631\u0648\u0641 \u0628\u0632\u0631\u06af \u0648 \u0633\u067e\u0633 \u0628\u0647 \u062d\u0631\u0648\u0641 \u06a9\u0648\u0686\u06a9 \u0628\u0631\u06af\u0631\u062f\u06cc\u062f\u060c \u0627\u0637\u0644\u0627\u0639\u0627\u062a \u062e\u0627\u0635\u06cc \u0631\u0627 \u0627\u0632 \u062f\u0633\u062a \u062e\u0648\u0627\u0647\u06cc\u062f \u062f\u0627\u062f:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> word = <span class=\"hljs-string\">\"Stra\u00dfe\"<\/span>;\n\nupperCase = word.toLocaleUpperCase(<span class=\"hljs-string\">'de-DE'<\/span>)\n\n<span class=\"hljs-built_in\">console<\/span>.log(upperCase) <span class=\"hljs-comment\">\/\/ STRASSE<\/span>\n<span class=\"hljs-built_in\">console<\/span>.log(upperCase.toLocaleLowerCase(<span class=\"hljs-string\">'de-DE'<\/span>)) <span class=\"hljs-comment\">\/\/ Strasse<\/span>\n<\/code><\/pre>\n<p>\u0628\u0627\u0632 \u0647\u0645\u060c \u0627\u06cc\u0646 \u0628\u0647 \u0627\u06cc\u0646 \u062f\u0644\u06cc\u0644 \u0627\u0633\u062a \u06a9\u0647 \u062f\u0631 \u0627\u06cc\u0646 \u0645\u062b\u0627\u0644\u060c \u0622\u0644\u0645\u0627\u0646\u06cc \u0627\u0632 \u0646\u06af\u0627\u0634\u062a \u0627\u0633\u062a\u0627\u0646\u062f\u0627\u0631\u062f \u06cc\u0648\u0646\u06cc\u06a9\u062f \u067e\u06cc\u0631\u0648\u06cc \u0645\u06cc \u06a9\u0646\u062f\u060c \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646 <code>toLocaleLowerCase()<\/code> \u0647\u0645\u0627\u0646 \u0646\u062a\u06cc\u062c\u0647 \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc \u06a9\u0646\u062f <code>toLowerCase()<\/code> &#8211; \u06a9\u0647 \u0641\u0642\u0637 \u0647\u0631 \u06a9\u0627\u0631\u0627\u06a9\u062a\u0631 \u0631\u0627 \u0628\u0647 \u0647\u0645\u062a\u0627\u06cc \u06a9\u0648\u0686\u06a9 \u062e\u0648\u062f \u062a\u063a\u06cc\u06cc\u0631 \u0645\u06cc \u062f\u0647\u062f.<\/p>\n<h3 id=\"substring\"><span class=\"ez-toc-section\" id=\"%d8%b2%db%8c%d8%b1_%d8%b1%d8%b4%d8%aa%d9%87\"><\/span><em>\u0632\u06cc\u0631 \u0631\u0634\u062a\u0647 ()<\/em><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><code>substring(start, end)<\/code>  \u0631\u0634\u062a\u0647 \u0627\u06cc \u0631\u0627 \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f \u06a9\u0647 \u0634\u0627\u0645\u0644 \u06a9\u0627\u0631\u0627\u06a9\u062a\u0631\u0647\u0627\u06cc\u06cc \u0627\u0633\u062a \u06a9\u0647 \u0627\u0632 the \u0634\u0631\u0648\u0639 \u0645\u06cc \u0634\u0648\u0646\u062f <code>start<\/code> \u0641\u0647\u0631\u0633\u062a \u0631\u0634\u062a\u0647 \u0627\u0635\u0644\u06cc \u062a\u0627 <code>end-1<\/code> \u0641\u0647\u0631\u0633\u062a \u0631\u0634\u062a\u0647 \u0627\u0635\u0644\u06cc<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"this is some string\"<\/span>;\n   \n<span class=\"hljs-built_in\">console<\/span>.log(x.substring(<span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">7<\/span>)); <span class=\"hljs-comment\">\/\/ Output: s is<\/span>\n<\/code><\/pre>\n<p>\u0647\u0645\u0627\u0646\u0637\u0648\u0631 \u06a9\u0647 \u0645\u06cc \u0628\u06cc\u0646\u06cc\u062f\u060c <code>end<\/code> \u0627\u06cc\u0646\u062f\u06a9\u0633 \u0634\u0627\u0645\u0644 \u0646\u06cc\u0633\u062a\u060c \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646 \u0631\u0634\u062a\u0647 \u062e\u0631\u0648\u062c\u06cc \u0627\u0632 \u0627\u0633\u062a <code>start<\/code> \u0628\u0647 <code>end-1<\/code>.<\/p>\n<p>\u0639\u0644\u0627\u0648\u0647 \u0628\u0631 \u0627\u06cc\u0646\u060c \u0627\u06cc\u0646 \u0627\u0644\u0628\u062a\u0647 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062c\u062f\u06cc\u062f \u0631\u0627 \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f\u060c \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0622\u0646 \u0631\u0627 \u0628\u0627 \u0627\u062e\u062a\u0635\u0627\u0635 \u062f\u0627\u062f\u0646 \u0622\u0646 \u0628\u0647 \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u0645\u0631\u062c\u0639 \u062c\u062f\u06cc\u062f \u0636\u0628\u0637 \u06a9\u0646\u06cc\u062f\u060c \u06cc\u0627 \u0641\u0642\u0637 \u0627\u0632 \u0622\u0646 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0648\u0631\u0648\u062f\u06cc \u06cc\u06a9 \u062a\u0627\u0628\u0639 \u062c\u062f\u06cc\u062f \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f.  \u0631\u0634\u062a\u0647 \u0627\u0635\u0644\u06cc \u0628\u062f\u0648\u0646 \u062a\u063a\u06cc\u06cc\u0631 \u0645\u06cc \u0645\u0627\u0646\u062f:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"this is some string\"<\/span>;\n<span class=\"hljs-keyword\">let<\/span> y = x.substring(<span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">7<\/span>);\n   \n<span class=\"hljs-built_in\">console<\/span>.log(x); <span class=\"hljs-comment\">\/\/ Output: this is some string<\/span>\n<span class=\"hljs-built_in\">console<\/span>.log(y); <span class=\"hljs-comment\">\/\/ Output: s is<\/span>\n<\/code><\/pre>\n<p>\u0627\u06af\u0631 \u0633\u0639\u06cc \u06a9\u0646\u06cc\u062f <code>substring()<\/code> \u0628\u0627 \u06cc\u06a9 <code>end<\/code> \u0641\u0631\u0627\u062a\u0631 <code>length<\/code> \u0627\u0632 \u0631\u0634\u062a\u0647 &#8211; \u0634\u0645\u0627 \u0628\u0647 \u0633\u0627\u062f\u06af\u06cc \u062a\u0645\u0627\u0645 \u06a9\u0627\u0631\u0627\u06a9\u062a\u0631\u0647\u0627\u06cc \u0645\u0648\u062c\u0648\u062f \u0631\u0627 \u062a\u0627 \u0627\u0646\u062a\u0647\u0627 \u0632\u06cc\u0631 \u0631\u0634\u062a\u0647 \u0645\u06cc \u06a9\u0646\u06cc\u062f:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"this is some string\"<\/span>;\n<span class=\"hljs-built_in\">console<\/span>.log(x.substring(<span class=\"hljs-number\">10<\/span>, <span class=\"hljs-number\">25<\/span>)); <span class=\"hljs-comment\">\/\/ Output: me string<\/span>\n<\/code><\/pre>\n<blockquote>\n<p>\u0627\u06cc\u0646 \u062a\u0627\u0628\u0639 \u0628\u0647 \u0648\u06cc\u0698\u0647 \u0628\u0631\u0627\u06cc \u06a9\u0648\u062a\u0627\u0647 \u06a9\u0631\u062f\u0646 \u062e\u0631\u0648\u062c\u06cc \u06cc\u0627 \u0648\u0631\u0648\u062f\u06cc \u06cc\u0627 \u062d\u062a\u06cc \u0628\u0631\u0631\u0633\u06cc \u0627\u06cc\u0646\u06a9\u0647 \u0622\u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u0628\u0627 \u06cc\u06a9 \u0632\u06cc\u0631\u0631\u0634\u062a\u0647 \u0645\u0634\u062e\u0635 \u0634\u0631\u0648\u0639 \u0645\u06cc \u0634\u0648\u062f \u06cc\u0627 \u062d\u0627\u0648\u06cc \u0622\u0646 \u0627\u0633\u062a \u0645\u0641\u06cc\u062f \u0627\u0633\u062a.<\/p>\n<\/blockquote>\n<h3 id=\"substrstartlength\"><span class=\"ez-toc-section\" id=\"substr_%d8%b4%d8%b1%d9%88%d8%b9%d8%8c_%d8%b7%d9%88%d9%84\"><\/span><em>substr (\u0634\u0631\u0648\u0639\u060c \u0637\u0648\u0644)<\/em><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0634\u0628\u06cc\u0647 \u0628\u0647 <code>substring()<\/code>\u060c <code>substr()<\/code> \u062a\u0627\u0628\u0639 \u0628\u0627 \u06af\u0631\u0641\u062a\u0646 \u06a9\u0627\u0631\u0627\u06a9\u062a\u0631\u0647\u0627\u06cc \u062e\u0627\u0635 \u0627\u0632 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u0627\u0635\u0644\u06cc \u062a\u0648\u0644\u06cc\u062f \u0645\u06cc \u0634\u0648\u062f.  \u062f\u0631 \u0627\u06cc\u0646\u062c\u0627 \u0645\u0627 \u0631\u0627 \u0645\u0634\u062e\u0635 \u0645\u06cc \u06a9\u0646\u06cc\u0645 <code>start<\/code> \u0627\u06cc\u0646\u062f\u06a9\u0633 \u0648 \u0627\u0646\u062f\u0627\u0632\u0647 \u0632\u06cc\u0631 \u0631\u0634\u062a\u0647 \u0645\u0648\u0631\u062f \u0646\u0638\u0631 \u06a9\u0647 \u0645\u06cc \u0628\u0627\u0634\u062f <code>length<\/code>\u060c \u0628\u0647 \u062c\u0627\u06cc \u0646\u0642\u0637\u0647 \u067e\u0627\u06cc\u0627\u0646\u06cc \u0645\u0634\u062e\u0635:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"this is some string\"<\/span>;\n   \n<span class=\"hljs-built_in\">console<\/span>.log(x.substr(<span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">4<\/span>)); <span class=\"hljs-comment\">\/\/ Output: s is<\/span>\n<\/code><\/pre>\n<p>\u0627\u06af\u0631 \u0637\u0648\u0644 \u0622\u0646 \u0641\u0631\u0627\u062a\u0631 \u0627\u0632 \u0645\u062d\u062f\u0648\u062f\u0647 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u0627\u0633\u062a\u060c \u0634\u0645\u0627 \u0628\u0647 \u0633\u0627\u062f\u06af\u06cc \u062a\u0627 \u0627\u0646\u062a\u0647\u0627 \u0632\u06cc\u0631 \u0631\u0634\u062a\u0647 \u06a9\u0646\u06cc\u062f:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"hello\"<\/span>;\n<span class=\"hljs-built_in\">console<\/span>.log(x.substr(<span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">10<\/span>)); <span class=\"hljs-comment\">\/\/ Output: lo<\/span>\n<\/code><\/pre>\n<h3 id=\"split\"><span class=\"ez-toc-section\" id=\"%d8%b4%da%a9%d8%a7%d9%81\"><\/span><em>\u0634\u06a9\u0627\u0641()<\/em><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0627\u06cc\u0646 <code>split(separator, limit)<\/code> \u062a\u0627\u0628\u0639 \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0639\u0628\u0627\u0631\u062a\u060c \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u0631\u0627 \u0628\u0647 \u0622\u0631\u0627\u06cc\u0647 \u0627\u06cc \u0627\u0632 \u0631\u0634\u062a\u0647 \u0647\u0627 \u062a\u0642\u0633\u06cc\u0645 \u0645\u06cc \u06a9\u0646\u062f <code>separator<\/code> \u0627\u0631\u0627\u0626\u0647 \u0634\u062f\u0647 \u0648 \u0628\u0647 \u0627\u0644\u0641 <code>limit<\/code> \u062a\u0639\u062f\u0627\u062f \u0642\u0637\u0639\u0627\u062a<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"this is some string\"<\/span>;\n   \n<span class=\"hljs-built_in\">console<\/span>.log(x.split(<span class=\"hljs-string\">\" \"<\/span>, <span class=\"hljs-number\">4<\/span>)); <span class=\"hljs-comment\">\/\/ Output: ('this', 'is', 'some', 'string')<\/span>\n<\/code><\/pre>\n<p>\u0627\u06af\u0631 \u0627\u0632 \u0647\u06cc\u0686 \u06a9\u062a\u0627\u0628\u062e\u0627\u0646\u0647 \u062e\u0627\u0631\u062c\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0646\u0645\u06cc \u06a9\u0646\u06cc\u062f\u060c \u0627\u06cc\u0646 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0628\u0631\u0627\u06cc \u062a\u062c\u0632\u06cc\u0647 \u062e\u0637\u0648\u0637 CSV \u0645\u0641\u06cc\u062f \u0628\u0627\u0634\u062f\u060c \u0632\u06cc\u0631\u0627 \u0622\u0646\u0647\u0627 \u0645\u0642\u0627\u062f\u06cc\u0631 \u062c\u062f\u0627 \u0634\u062f\u0647 \u0628\u0627 \u06a9\u0627\u0645\u0627 \u0647\u0633\u062a\u0646\u062f \u06a9\u0647 \u0628\u0647 \u0631\u0627\u062d\u062a\u06cc \u0627\u0632 \u0637\u0631\u06cc\u0642 <code>split()<\/code> \u062a\u0627\u0628\u0639.  \u0628\u0627 \u0627\u06cc\u0646 \u062d\u0627\u0644\u060c \u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u0628\u0627 \u0641\u0627\u06cc\u0644\u200c\u0647\u0627\u06cc CSV \u0633\u0631\u0648\u06a9\u0627\u0631 \u062f\u0627\u0631\u06cc\u062f\u060c \u0627\u06af\u0631 \u0628\u0647 \u062f\u0631\u0633\u062a\u06cc \u0642\u0627\u0644\u0628\u200c\u0628\u0646\u062f\u06cc \u0646\u0634\u062f\u0647 \u0628\u0627\u0634\u0646\u062f\u060c \u0645\u06cc\u200c\u062e\u0648\u0627\u0647\u06cc\u062f \u0627\u0639\u062a\u0628\u0627\u0631\u0633\u0646\u062c\u06cc \u0631\u0627 \u0627\u0646\u062c\u0627\u0645 \u062f\u0647\u06cc\u062f.<\/p>\n<p>\u0628\u0647 \u0637\u0648\u0631 \u0645\u0639\u0645\u0648\u0644\u060c \u0634\u0645\u0627 \u0627\u0632 \u06a9\u062a\u0627\u0628\u062e\u0627\u0646\u0647 \u0647\u0627 \u0628\u0631\u0627\u06cc \u0627\u06cc\u0646 \u06a9\u0627\u0631 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u062e\u0648\u0627\u0647\u06cc\u062f \u06a9\u0631\u062f\u060c \u0632\u06cc\u0631\u0627 \u0622\u0646\u0647\u0627 \u06a9\u0627\u0631 \u0631\u0627 \u0628\u0633\u06cc\u0627\u0631 \u0622\u0633\u0627\u0646 \u062a\u0631 \u0645\u06cc \u06a9\u0646\u0646\u062f.<\/p>\n<blockquote>\n<p>\u0627\u06af\u0631 \u0645\u06cc\u200c\u062e\u0648\u0627\u0647\u06cc\u062f \u062f\u0631\u0628\u0627\u0631\u0647 \u062e\u0648\u0627\u0646\u062f\u0646 \u0641\u0627\u06cc\u0644\u200c\u0647\u0627\u06cc CSV \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0627\u0637\u0644\u0627\u0639\u0627\u062a \u0628\u06cc\u0634\u062a\u0631\u06cc \u06a9\u0633\u0628 \u06a9\u0646\u06cc\u062f\u060c \u0631\u0627\u0647\u0646\u0645\u0627\u06cc \u0645\u0627 \u0631\u0627 \u0628\u062e\u0648\u0627\u0646\u06cc\u062f \u0631\u0648\u06cc \u062e\u0648\u0627\u0646\u062f\u0646 \u0648 \u0646\u0648\u0634\u062a\u0646 CSV \u0628\u0627 node-csv \u0648 \u062e\u0648\u0627\u0646\u062f\u0646 \u0648 \u0646\u0648\u0634\u062a\u0646 CSV \u0628\u0627 Node.js.<\/p>\n<\/blockquote>\n<h3 id=\"charatandstringindex\"><span class=\"ez-toc-section\" id=\"charat_%d9%88_%d8%b1%d8%b4%d8%aa%d9%87_%d8%b4%d8%a7%d8%ae%d8%b5\"><\/span><em>charAt()<\/em> \u0648 <em>\u0631\u0634\u062a\u0647 (\u0634\u0627\u062e\u0635)<\/em><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0627\u06cc\u0646 <code>charAt(index)<\/code> \u062a\u0627\u0628\u0639 \u06a9\u0627\u0631\u0627\u06a9\u062a\u0631 \u0631\u0627 \u062f\u0631 \u0645\u0642\u062f\u0627\u0631 \u0645\u0634\u062e\u0635 \u0634\u062f\u0647 \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f <code>index<\/code>.<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"abc123\"<\/span>;\n   \n<span class=\"hljs-built_in\">console<\/span>.log(x.charAt(<span class=\"hljs-number\">2<\/span>)); <span class=\"hljs-comment\">\/\/ Output: c<\/span>\n<\/code><\/pre>\n<p>\u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0627\u0632 \u0627\u06cc\u0646 \u0628\u0631\u0627\u06cc \u062a\u06a9\u0631\u0627\u0631 \u0627\u0632 \u0637\u0631\u06cc\u0642 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u0648 \u0628\u0627\u0632\u06cc\u0627\u0628\u06cc \u0645\u062d\u062a\u0648\u0627\u06cc \u0622\u0646 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f\u060c \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0645\u062b\u0627\u0644:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"some string\"<\/span>;\n\n<span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-keyword\">let<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; x.length; i++) {\n    <span class=\"hljs-built_in\">console<\/span>.log(x.charAt(i));\n}\n<\/code><\/pre>\n<p>\u06a9\u0647 \u0645\u0646\u062c\u0631 \u0628\u0647:<\/p>\n<pre><code class=\"hljs\">s\no\nm\ne\n \ns\nt\nr\ni\nn\ng\n<\/code><\/pre>\n<blockquote>\n<p>\u0686\u0647 \u0641\u0631\u0642\u06cc \u0628\u0627 \u0647\u0645 \u062f\u0627\u0631\u0646\u062f <code>x.charAt(y)<\/code> \u0648 <code>x(y)<\/code>?<\/p>\n<\/blockquote>\n<p>\u0686\u0646\u062f \u062f\u0644\u06cc\u0644 \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f \u06a9\u0647 \u0686\u0631\u0627 \u0634\u0645\u0627 \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u062a\u0631\u062c\u06cc\u062d \u062f\u0647\u06cc\u062f <code>charAt()<\/code> \u0631\u0648\u06cc \u0646\u0645\u0627\u062f \u0622\u0631\u0627\u06cc\u0647:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"some string\"<\/span>;\n\n<span class=\"hljs-comment\">\/\/ There is no element 5.7<\/span>\n<span class=\"hljs-built_in\">console<\/span>.log(x(<span class=\"hljs-number\">5.7<\/span>));\n\n<span class=\"hljs-comment\">\/\/ 5.7 gets rounded down to 5<\/span>\n<span class=\"hljs-built_in\">console<\/span>.log(x.charAt(<span class=\"hljs-number\">5.7<\/span>));\n\n<span class=\"hljs-comment\">\/\/ The array notation makes it appear as if we can just assign<\/span>\n<span class=\"hljs-comment\">\/\/ new values to elements, even though strings are immutable<\/span>\nx(<span class=\"hljs-number\">5<\/span>) = <span class=\"hljs-string\">'g'<\/span>;\n<span class=\"hljs-built_in\">console<\/span>.log(x);\n\n<span class=\"hljs-comment\">\/\/ With charAt(), it's much more obvious that<\/span>\n<span class=\"hljs-comment\">\/\/ this line doesn't make sense and will throw an exception<\/span>\nx.charAt(<span class=\"hljs-number\">5<\/span>) = <span class=\"hljs-string\">'g'<\/span>;\n<\/code><\/pre>\n<p>\u0628\u0627 \u0627\u06cc\u0646 \u062d\u0627\u0644\u060c \u06cc\u06a9 \u0634\u0645\u0634\u06cc\u0631 \u062f\u0648 \u0644\u0628\u0647 \u062f\u0631 \u0627\u062c\u0631\u0627\u06cc \u0622\u0646 \u067e\u0646\u0647\u0627\u0646 \u0627\u0633\u062a <code>charAt()<\/code> \u062a\u0627\u0628\u0639 &#8211; <strong>\u0627\u06cc\u0646 \u0634\u0627\u062e\u0635 \u0631\u0627 \u0627\u0631\u0632\u06cc\u0627\u0628\u06cc \u06a9\u0631\u062f\u0647 \u0648 \u0622\u0646 \u0631\u0627 \u067e\u0631\u062f\u0627\u0632\u0634 \u0645\u06cc \u06a9\u0646\u062f.<\/strong><\/p>\n<p>\u0627\u0632 \u0647\u0645\u06cc\u0646 \u0631\u0648 <code>5.7<\/code> \u0628\u0647 \u067e\u0627\u06cc\u06cc\u0646 \u06af\u0631\u062f \u0634\u062f <code>5<\/code>.  \u0647\u0645\u0686\u0646\u06cc\u0646 \u0627\u06cc\u0646 \u0645\u0631\u062d\u0644\u0647 \u067e\u0631\u062f\u0627\u0632\u0634 \u0631\u0627 \u0628\u0631\u0627\u06cc \u0648\u0631\u0648\u062f\u06cc\u200c\u0647\u0627\u06cc\u06cc \u0627\u0646\u062c\u0627\u0645 \u0645\u06cc\u200c\u062f\u0647\u062f \u06a9\u0647 \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u062f\u0631 \u0648\u0627\u0642\u0639 \u0645\u0639\u062a\u0628\u0631 \u0646\u0628\u0627\u0634\u0646\u062f\u060c \u0627\u0645\u0627 \u0627\u06cc\u0646 \u062a\u0648\u0647\u0645 \u06a9\u062f\u06cc \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc\u200c\u06a9\u0646\u062f \u06a9\u0647 \u0628\u0647 \u062e\u0648\u0628\u06cc \u0627\u062c\u0631\u0627 \u0645\u06cc\u200c\u0634\u0648\u062f:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"some string\"<\/span>;\n\n<span class=\"hljs-built_in\">console<\/span>.log(x.charAt(<span class=\"hljs-literal\">true<\/span>));\n<span class=\"hljs-built_in\">console<\/span>.log(x.charAt(<span class=\"hljs-literal\">NaN<\/span>));\n<span class=\"hljs-built_in\">console<\/span>.log(x.charAt(<span class=\"hljs-literal\">undefined<\/span>));\n<span class=\"hljs-built_in\">console<\/span>.log(x.charAt(()))\n<span class=\"hljs-built_in\">console<\/span>.log(x.charAt(<span class=\"hljs-string\">\"\"<\/span>))\n<\/code><\/pre>\n<p><code>true<\/code>  \u062a\u0628\u062f\u06cc\u0644 \u0645\u06cc \u0634\u0648\u062f \u0628\u0647 <code>1<\/code>\u060c \u062f\u0631 \u062d\u0627\u0644\u06cc \u06a9\u0647 <code>false<\/code> \u062a\u0628\u062f\u06cc\u0644 \u062e\u0648\u0627\u0647\u062f \u0634\u062f \u0628\u0647 <code>0<\/code>. <code>NaN<\/code>\u060c <code>undefined<\/code>\u060c \u06cc\u06a9 \u0622\u0631\u0627\u06cc\u0647 \u062e\u0627\u0644\u06cc \u0648 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u062e\u0627\u0644\u06cc \u0646\u06cc\u0632 \u0628\u0647 \u062a\u0628\u062f\u06cc\u0644 \u0645\u06cc \u0634\u0648\u0646\u062f <code>0<\/code>\u060c \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646 \u0627\u06cc\u0646 \u0628\u0647 \u062e\u0648\u0628\u06cc \u0627\u062c\u0631\u0627 \u0645\u06cc \u0634\u0648\u062f\u060c \u062d\u062a\u06cc \u0627\u06af\u0631 \u0628\u0647 \u0637\u0648\u0631 \u0634\u0647\u0648\u062f\u06cc \u0646\u0628\u0627\u06cc\u062f \u0627\u06cc\u0646 \u06a9\u0627\u0631 \u0631\u0627 \u0627\u0646\u062c\u0627\u0645 \u062f\u0647\u062f:<\/p>\n<pre><code class=\"hljs\">o\ns\ns\ns\ns\n<\/code><\/pre>\n<p>\u0627\u0632 \u0633\u0648\u06cc \u062f\u06cc\u06af\u0631\u060c \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0646\u0645\u0627\u062f \u0622\u0631\u0627\u06cc\u0647 \u0645\u062f\u0631\u0646 \u062a\u0631:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-built_in\">console<\/span>.log(x(<span class=\"hljs-literal\">true<\/span>));\n<span class=\"hljs-built_in\">console<\/span>.log(x(<span class=\"hljs-literal\">NaN<\/span>));\n<span class=\"hljs-built_in\">console<\/span>.log(x(<span class=\"hljs-literal\">undefined<\/span>));\n<span class=\"hljs-built_in\">console<\/span>.log(x(()));\n<span class=\"hljs-built_in\">console<\/span>.log(x(<span class=\"hljs-string\">\"\"<\/span>));\n<\/code><\/pre>\n<p>\u0627\u06cc\u0646\u0647\u0627 \u0646\u062a\u06cc\u062c\u0647 \u0634\u0647\u0648\u062f\u06cc \u062a\u0631\u06cc \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc \u06a9\u0646\u0646\u062f \u06a9\u0647 \u0646\u0634\u0627\u0646 \u062f\u0647\u0646\u062f\u0647 \u0634\u06a9\u0633\u062a \u0648\u0631\u0648\u062f\u06cc \u0627\u0633\u062a:<\/p>\n<pre><code class=\"hljs\">undefined\nundefined\nundefined\nundefined\nundefined\n<\/code><\/pre>\n<h3 id=\"indexof\"><span class=\"ez-toc-section\" id=\"indexof\"><\/span><em>indexOf()<\/em><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><code>indexOf(character)<\/code>  \u0645\u0642\u062f\u0627\u0631 \u0634\u0627\u062e\u0635 \u0631\u0627 \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f <em>\u0627\u0648\u0644\u06cc\u0646 \u0627\u062a\u0641\u0627\u0642<\/em> \u0627\u0632 \u0645\u0634\u062e\u0635 \u0634\u062f\u0647 <code>character<\/code>:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"aaabbb\"<\/span>;\n   \n<span class=\"hljs-built_in\">console<\/span>.log(x.indexOf(<span class=\"hljs-string\">\"b\"<\/span>)); <span class=\"hljs-comment\">\/\/ Output: 3<\/span>\n<\/code><\/pre>\n<p>\u0627\u06af\u0631 \u0634\u062e\u0635\u06cc\u062a \u0648\u062c\u0648\u062f \u0646\u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u062f\u060c <code>-1<\/code> \u0628\u0631\u06af\u0631\u062f\u0627\u0646\u062f\u0647 \u0645\u06cc \u0634\u0648\u062f:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"some string\"<\/span>;\n\n<span class=\"hljs-built_in\">console<\/span>.log(x.indexOf(<span class=\"hljs-string\">'h'<\/span>)); <span class=\"hljs-comment\">\/\/ Output: -1<\/span>\n<\/code><\/pre>\n<p>\u0647\u0645\u0686\u0646\u06cc\u0646 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0628\u0647 \u0635\u0648\u0631\u062a \u0627\u062e\u062a\u06cc\u0627\u0631\u06cc \u0627\u0632 \u0627\u0648\u0644\u06cc\u0646 \u0645\u0648\u0631\u062f \u0631\u062f \u0634\u0648\u06cc\u062f <code>n<\/code> \u06a9\u0627\u0631\u0627\u06a9\u062a\u0631\u0647\u0627 \u0628\u0627 \u0645\u0634\u062e\u0635 \u06a9\u0631\u062f\u0646 \u06cc\u06a9 <code>fromIndex<\/code> \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0627\u0633\u062a\u062f\u0644\u0627\u0644 \u062f\u0648\u0645:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"aaabbb\"<\/span>;\n   \n<span class=\"hljs-built_in\">console<\/span>.log(x.indexOf(<span class=\"hljs-string\">\"b\"<\/span>, <span class=\"hljs-number\">4<\/span>)); <span class=\"hljs-comment\">\/\/ Output: 4<\/span>\n<\/code><\/pre>\n<p>\u062f\u0631 \u0627\u06cc\u0646\u062c\u0627\u060c \u0627\u0632 3 \u06a9\u0627\u0631\u0627\u06a9\u062a\u0631 \u0627\u0648\u0644 (\u0646\u0645\u0627\u06cc\u0647 \u0633\u0627\u0632\u06cc \u0645\u0628\u062a\u0646\u06cc \u0628\u0631 0) \u0635\u0631\u0641 \u0646\u0638\u0631 \u0645\u06cc \u06a9\u0646\u06cc\u0645 \u0648 \u0634\u0631\u0648\u0639 \u0628\u0647 \u0634\u0645\u0627\u0631\u0634 \u0645\u06cc \u06a9\u0646\u06cc\u0645 \u0631\u0648\u06cc 4.  \u0627\u062a\u0641\u0627\u0642\u0627 \u0634\u062e\u0635\u06cc\u062a 4 <em>\u0627\u0633\u062a<\/em> \u0622 <code>'b'<\/code> \u0645\u0627 \u0628\u0647 \u062f\u0646\u0628\u0627\u0644 \u0622\u0646 \u0647\u0633\u062a\u06cc\u0645\u060c \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646 \u0627\u06cc\u0646\u062f\u06a9\u0633 \u0628\u0631\u06af\u0631\u062f\u0627\u0646\u062f\u0647 \u0645\u06cc \u0634\u0648\u062f.<\/p>\n<h3 id=\"lastindexof\"><span class=\"ez-toc-section\" id=\"lastindexof\"><\/span><em>lastIndexOf()<\/em><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><code>lastIndexOf(character)<\/code>  \u0645\u0642\u062f\u0627\u0631 \u0634\u0627\u062e\u0635 \u0631\u0627 \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f <em>\u0622\u062e\u0631\u06cc\u0646 \u0627\u062a\u0641\u0627\u0642<\/em> \u0627\u0632 \u0645\u0634\u062e\u0635 \u0634\u062f\u0647 <code>character<\/code>:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"aaabbb\"<\/span>;\n    \nconosle.log(x.lastIndexOf(<span class=\"hljs-string\">\"b\"<\/span>)); <span class=\"hljs-comment\">\/\/ Output: 5<\/span>\n<\/code><\/pre>\n<p>\u062a\u0642\u0631\u06cc\u0628\u0627\u064b \u0647\u0645\u0627\u0646 \u0642\u0648\u0627\u0646\u06cc\u0646\u06cc \u06a9\u0647 \u0628\u0631\u0627\u06cc <code>indexOf()<\/code> \u062a\u0627\u0628\u0639:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"aaabbb\"<\/span>;\n   \n<span class=\"hljs-built_in\">console<\/span>.log(x.lastIndexOf(<span class=\"hljs-string\">\"b\"<\/span>)); <span class=\"hljs-comment\">\/\/ Output: 5<\/span>\n<span class=\"hljs-built_in\">console<\/span>.log(x.lastIndexOf(<span class=\"hljs-string\">\"b\"<\/span>, <span class=\"hljs-number\">3<\/span>)); <span class=\"hljs-comment\">\/\/ Output: 3<\/span>\n<span class=\"hljs-built_in\">console<\/span>.log(x.lastIndexOf(<span class=\"hljs-string\">\"g\"<\/span>)); <span class=\"hljs-comment\">\/\/ Output: -1<\/span>\n<\/code><\/pre>\n<p>\u0627\u06cc\u0646 \u0631\u0648\u0634 \u0627\u0632 \u0627\u0646\u062a\u0647\u0627\u06cc \u0631\u0634\u062a\u0647 \u0628\u0647 \u0639\u0642\u0628 \u0634\u0645\u0627\u0631\u0634 \u0645\u06cc \u06a9\u0646\u062f\u060c \u0627\u0645\u0627 \u0627\u06af\u0631 a \u0631\u0627 \u0639\u0631\u0636\u0647 \u06a9\u0646\u06cc\u0645 <code>fromIndex<\/code> \u0622\u0631\u06af\u0648\u0645\u0627\u0646 \u062f\u0631 \u0627\u06cc\u0646\u062c\u0627\u060c \u0634\u0627\u062e\u0635 \u0627\u0632 \u0633\u0645\u062a \u0686\u067e \u0634\u0645\u0627\u0631\u0634 \u0645\u06cc \u0634\u0648\u062f.  \u062f\u0631 \u0645\u0648\u0631\u062f \u0645\u0627:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-comment\">\/\/       012345<\/span>\n<span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"aaabbb\"<\/span>;\n<span class=\"hljs-comment\">\/\/          \u2191 lastIndexOf() start<\/span>\n<\/code><\/pre>\n<p>\u0648 <code>lastIndexOf()<\/code> \u0634\u0645\u0627\u0631\u0634 \u0627\u0632 <code>3<\/code> \u0628\u0647 <code>0<\/code>\u060c \u0647\u0645\u0627\u0646\u0637\u0648\u0631 \u06a9\u0647 \u0645\u0627 \u062a\u0646\u0638\u06cc\u0645 \u06a9\u0631\u062f\u0647 \u0627\u06cc\u0645 <code>fromIndex<\/code> \u0628\u0648\u062f\u0646 <code>3<\/code>.<\/p>\n<h3 id=\"search\"><span class=\"ez-toc-section\" id=\"%d8%ac%d8%b3%d8%aa%d8%ac%d9%88_%da%a9%d8%b1%d8%af%d9%86\"><\/span><em>\u062c\u0633\u062a\u062c\u0648 \u06a9\u0631\u062f\u0646()<\/em><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0627\u06cc\u0646 <code>search(string)<\/code> \u062a\u0627\u0628\u0639 a \u0631\u0627 \u062c\u0633\u062a\u062c\u0648 \u0645\u06cc \u06a9\u0646\u062f <code>string<\/code> \u0648 \u0627\u06af\u0631 \u06cc\u0627\u0641\u062a \u0634\u062f\u060c \u0634\u0627\u062e\u0635 \u0627\u0628\u062a\u062f\u0627\u06cc \u0631\u0634\u062a\u0647 \u067e\u06cc\u062f\u0627 \u0634\u062f\u0647 \u0631\u0627 \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"JavaScript, often abbreviated as JS, is a programming language that conforms to the ECMAScript specification. JavaScript is high-level, often just-in-time compiled, and multi-paradigm.\"<\/span>;\n    \n<span class=\"hljs-built_in\">console<\/span>.log(x.search(<span class=\"hljs-string\">\"programming\"<\/span>)); <span class=\"hljs-comment\">\/\/ Output: 42<\/span>\n<\/code><\/pre>\n<p>\u062f\u0631 \u0635\u0648\u0631\u062a \u0648\u062c\u0648\u062f \u0631\u0634\u062a\u0647 \u0647\u0627\u06cc \u0645\u062a\u0639\u062f\u062f \u0645\u062a\u0646\u0627\u0633\u0628 \u0628\u0627 \u06a9\u0644\u0645\u0647 \u06a9\u0644\u06cc\u062f\u06cc \u062c\u0633\u062a\u062c\u0648\u060c \u0645\u0627\u0646\u0646\u062f <code>'JavaScript'<\/code>\u060c \u0641\u0642\u0637 \u0634\u0627\u062e\u0635 \u0634\u0631\u0648\u0639 \u0627\u0648\u0644\u06cc\u0646 \u0645\u0648\u0631\u062f \u062a\u0637\u0628\u06cc\u0642 \u0628\u0631\u06af\u0631\u062f\u0627\u0646\u062f\u0647 \u0645\u06cc \u0634\u0648\u062f:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">let<\/span> x = <span class=\"hljs-string\">\"JavaScript, often abbreviated as JS, is a programming language that conforms to the ECMAScript specification. JavaScript is high-level, often just-in-time compiled, and multi-paradigm.\"<\/span>;\n    \n<span class=\"hljs-built_in\">console<\/span>.log(x.search(<span class=\"hljs-string\">\"JavaScript\"<\/span>)); <span class=\"hljs-comment\">\/\/ Output: 0<\/span>\n<\/code><\/pre>\n<h2 id=\"conclusion\"><span class=\"ez-toc-section\" id=\"%d9%86%d8%aa%db%8c%d8%ac%d9%87\"><\/span>\u0646\u062a\u06cc\u062c\u0647<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u06cc\u06a9 \u0632\u0628\u0627\u0646 \u06af\u0633\u062a\u0631\u062f\u0647 \u0648 \u0631\u0627\u06cc\u062c \u0627\u0633\u062a \u0631\u0648\u06cc \u0648\u0628\u060c \u0648 \u0622\u0634\u0646\u0627\u06cc\u06cc \u0628\u0627 \u062a\u0648\u0627\u0628\u0639 \u0627\u0633\u0627\u0633\u06cc \u062f\u0627\u062e\u0644\u06cc \u0628\u0647 \u0634\u0645\u0627 \u06a9\u0645\u06a9 \u0645\u06cc \u06a9\u0646\u062f \u062a\u0627 \u0627\u0632 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u06a9\u062a\u0627\u0628\u062e\u0627\u0646\u0647 \u0647\u0627\u06cc \u062e\u0627\u0631\u062c\u06cc \u063a\u06cc\u0631 \u0636\u0631\u0648\u0631\u06cc \u0627\u062c\u062a\u0646\u0627\u0628 \u06a9\u0646\u06cc\u062f\u060c \u0632\u0645\u0627\u0646\u06cc \u06a9\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u062f\u0631 \u0648\u0627\u0646\u06cc\u0644 JS \u0628\u0647 \u0646\u062a\u06cc\u062c\u0647 \u0628\u0631\u0633\u06cc\u062f.<\/p>\n<p>\u062f\u0631 \u0627\u06cc\u0646 \u0631\u0627\u0647\u0646\u0645\u0627\u060c \u0646\u06af\u0627\u0647\u06cc \u0628\u0647 \u062a\u0648\u0627\u0628\u0639 \u062f\u0627\u062e\u0644\u06cc \u0631\u0634\u062a\u0647 \u0647\u0627 \u0627\u0646\u062f\u0627\u062e\u062a\u0647 \u0627\u06cc\u0645 &#8211; \u06cc\u06a9\u06cc \u0627\u0632 \u0631\u0627\u06cc\u062c \u062a\u0631\u06cc\u0646 \u0627\u0646\u0648\u0627\u0639 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u0645\u0648\u062c\u0648\u062f \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a.<\/p>\n<\/div>\n<p><br \/>\n<br \/>\u0645\u0646\u062a\u0634\u0631 \u0634\u062f\u0647 \u062f\u0631 1403-01-15 06:29:03<br \/>\n<\/p>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-center kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;center&quot;,&quot;id&quot;:&quot;15660&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;\u0627\u0645\u062a\u06cc\u0627\u0632 \u0634\u0645\u0627 \u0628\u0647 \u0627\u06cc\u0646 \u0645\u0637\u0644\u0628&quot;,&quot;legend&quot;:&quot;0\\\/5 (0 \u0631\u0627\u06cc)&quot;,&quot;size&quot;:&quot;30&quot;,&quot;title&quot;:&quot;\u06a9\u0627\u0631 \u0628\u0627 \u062a\u0648\u0627\u0628\u0639 \u0631\u0634\u062a\u0647 \u0627\u06cc \u062f\u0627\u062e\u0644\u06cc \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0647\u0646\u06af\u0627\u0645 \u06a9\u0627\u0631 \u0628\u0627 \u0647\u0631 \u0632\u0628\u0627\u0646 \u0628\u0631\u0646\u0627\u0645\u0647 \u0646\u0648\u06cc\u0633\u06cc\u060c \u0627\u062d\u062a\u0645\u0627\u0644\u0627\u064b \u0628\u0647 \u0628\u0631\u062e\u06cc \u0627\u0632 \u0639\u0645\u0644\u06a9\u0631\u062f\u0647\u0627 \u0646\u06cc\u0627\u0632 \u062e\u0648\u0627\u0647\u06cc\u062f \u062f\u0627\u0634\u062a \u06a9\u0647 \u0628\u0647 \u0637\u0648\u0631 \u0628\u0648\u0645\u06cc \u0628\u0627 \u0622\u0646 \u0632\u0628\u0627\u0646 \u0627\u062f\u063a\u0627\u0645 \u0646\u0634\u062f\u0647 \u0628\u0627\u0634\u0646\u062f.  \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646\u060c \u06cc\u0627 \u062e\u0648\u062f\u062a\u0627\u0646 \u0622\u0646\u0647\u0627 \u0631\u0627 \u067e\u06cc\u0627\u062f\u0647 \u0633\u0627\u0632\u06cc \u0645\u06cc \u06a9\u0646\u06cc\u062f\u060c \u06cc\u0627 \u0628\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0645\u0627\u0698\u0648\u0644 \u0647\u0627 \u06cc\u0627 \u06a9\u062a\u0627\u0628\u062e\u0627\u0646\u0647 \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u0631\u0648\u06cc \u0645\u06cc \u0622\u0648\u0631\u06cc\u062f.  \u0627\u06cc\u0646 \u0628\u0647 \u0637\u0648\u0631 \u0645\u0633\u062a\u0642\u06cc\u0645 \u0628\u0631 \u06a9\u0627\u0631\u0627\u06cc\u06cc \u0628\u0631\u0646\u0627\u0645\u0647 \u0634\u0645\u0627 \u062a\u0623\u062b\u06cc\u0631 \u0645\u06cc \u06af\u0630\u0627\u0631\u062f (\u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u062d\u0627\u0641\u0638\u0647 \u0628\u06cc\u0634\u062a\u0631\u060c \u062f\u0631\u062e\u0648\u0627\u0633\u062a \u0647\u0627\u06cc HTTP \u0628\u06cc\u0634\u062a\u0631 \u0648 \u063a\u06cc\u0631\u0647).  \u0628\u0631\u0627\u06cc \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc...&quot;,&quot;width&quot;:&quot;0&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} ({count} \u0631\u0627\u06cc)&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-left: 5px\">\n           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height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 24px;\">\n            <span class=\"kksr-muted\">\u0627\u0645\u062a\u06cc\u0627\u0632 \u0634\u0645\u0627 \u0628\u0647 \u0627\u06cc\u0646 \u0645\u0637\u0644\u0628<\/span>\n    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">\u0632\u0645\u0627\u0646 \u0644\u0627\u0632\u0645 \u0628\u0631\u0627\u06cc \u0645\u0637\u0627\u0644\u0639\u0647: <\/span> <span class=\"rt-time\"> 8<\/span> <span class=\"rt-label rt-postfix\">\u062f\u0642\u06cc\u0642\u0647<\/span><\/span>\u0645\u0639\u0631\u0641\u06cc \u0647\u0646\u06af\u0627\u0645 \u06a9\u0627\u0631 \u0628\u0627 \u0647\u0631 \u0632\u0628\u0627\u0646 \u0628\u0631\u0646\u0627\u0645\u0647 \u0646\u0648\u06cc\u0633\u06cc\u060c \u0627\u062d\u062a\u0645\u0627\u0644\u0627\u064b \u0628\u0647 \u0628\u0631\u062e\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f\u0647\u0627 \u0646\u06cc\u0627\u0632 \u062e\u0648\u0627\u0647\u06cc\u062f \u062f\u0627\u0634\u062a \u06a9\u0647 \u0628\u0647 \u0637\u0648\u0631 \u0628\u0648\u0645\u06cc \u0628\u0627 \u0622\u0646 \u0632\u0628\u0627\u0646 \u0627\u062f\u063a\u0627\u0645 \u0646\u0634\u062f\u0647 \u0628\u0627\u0634\u062f. \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646\u060c \u06cc\u0627 \u062e\u0648\u062f\u062a\u0627\u0646 \u0622\u0646\u0647\u0627 \u0631\u0627 \u067e\u06cc\u0627\u062f\u0647 \u0633\u0627\u0632\u06cc \u0645\u06cc \u06a9\u0646\u06cc\u062f\u060c \u06cc\u0627 \u0628\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0645\u0627\u0698\u0648\u0644 \u0647\u0627 \u06cc\u0627 \u06a9\u062a\u0627\u0628\u062e\u0627\u0646\u0647 \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u0631\u0648\u06cc \u0645\u06cc \u0622\u0648\u0631\u06cc\u062f. \u0627\u06cc\u0646 \u0628\u0647 \u0637\u0648\u0631 \u0645\u0633\u062a\u0642\u06cc\u0645 \u0628\u0631 \u06a9\u0627\u0631\u0627\u06cc\u06cc \u0628\u0631\u0646\u0627\u0645\u0647 \u0634\u0645\u0627 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