{"id":25426,"date":"2023-06-02T17:05:32","date_gmt":"2023-06-02T13:35:32","guid":{"rendered":"https:\/\/nabfollower.com\/blog\/learn-about-the-difference-between-var-let-and-const-keywords-in-javascript-and-when-to-use-them-2638\/"},"modified":"2023-06-02T17:05:32","modified_gmt":"2023-06-02T13:35:32","slug":"learn-about-the-difference-between-var-let-and-const-keywords-in-javascript-and-when-to-use-them-2638","status":"publish","type":"post","link":"https:\/\/nabfollower.com\/blog\/learn-about-the-difference-between-var-let-and-const-keywords-in-javascript-and-when-to-use-them-2638\/","title":{"rendered":"\u0628\u0627 \u062a\u0641\u0627\u0648\u062a \u0628\u06cc\u0646 \u06a9\u0644\u0645\u0627\u062a \u06a9\u0644\u06cc\u062f\u06cc var\u060c let \u0648 const \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0648 \u0632\u0645\u0627\u0646 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0622\u0646\u0647\u0627 \u0622\u0634\u0646\u0627 \u0634\u0648\u06cc\u062f."},"content":{"rendered":"<div data-article-id=\"1489430\" id=\"article-body\">\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter-rtl ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0641\u0647\u0631\u0633\u062a \u0645\u0637\u0627\u0644\u0628<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<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:\/\/nabfollower.com\/blog\/learn-about-the-difference-between-var-let-and-const-keywords-in-javascript-and-when-to-use-them-2638\/#var%D8%8C_let_%D9%88_const_%D8%AA%D9%81%D8%A7%D9%88%D8%AA_%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_%DA%86%DB%8C%D8%B3%D8%AA%D8%9F\" >var\u060c let \u0648 const: \u062a\u0641\u0627\u0648\u062a \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0686\u06cc\u0633\u062a\u061f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/nabfollower.com\/blog\/learn-about-the-difference-between-var-let-and-const-keywords-in-javascript-and-when-to-use-them-2638\/#%D9%85%D8%AA%D8%BA%DB%8C%D8%B1_%DA%86%DB%8C%D8%B3%D8%AA%D8%9F\" >\u0645\u062a\u063a\u06cc\u0631 \u0686\u06cc\u0633\u062a\u061f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/nabfollower.com\/blog\/learn-about-the-difference-between-var-let-and-const-keywords-in-javascript-and-when-to-use-them-2638\/#%D8%AA%D9%81%D8%A7%D9%88%D8%AA_%D8%A8%DB%8C%D9%86_var%D8%8C_let_%D9%88_const_%DA%86%DB%8C%D8%B3%D8%AA%D8%9F\" >\u062a\u0641\u0627\u0648\u062a \u0628\u06cc\u0646 var\u060c let \u0648 const \u0686\u06cc\u0633\u062a\u061f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/nabfollower.com\/blog\/learn-about-the-difference-between-var-let-and-const-keywords-in-javascript-and-when-to-use-them-2638\/#%D9%86%D8%AA%DB%8C%D8%AC%D9%87\" >\u0646\u062a\u06cc\u062c\u0647<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"var%D8%8C_let_%D9%88_const_%D8%AA%D9%81%D8%A7%D9%88%D8%AA_%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_%DA%86%DB%8C%D8%B3%D8%AA%D8%9F\"><\/span>\n<p>  var\u060c let \u0648 const: \u062a\u0641\u0627\u0648\u062a \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0686\u06cc\u0633\u062a\u061f<br \/>\n<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 \u067e\u0648\u06cc\u0627 \u0648 \u0627\u0646\u0639\u0637\u0627\u0641 \u067e\u0630\u06cc\u0631 \u0627\u0633\u062a \u06a9\u0647 \u0628\u0647 \u0634\u0645\u0627 \u0627\u0645\u06a9\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f \u0645\u062a\u063a\u06cc\u0631\u0647\u0627 \u0631\u0627 \u0628\u0647 \u0631\u0648\u0634 \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u0627\u0639\u0644\u0627\u0645 \u06a9\u0646\u06cc\u062f.  \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0627\u0632 \u06a9\u0644\u0645\u0627\u062a \u06a9\u0644\u06cc\u062f\u06cc var\u060c let \u06cc\u0627 const \u0628\u0631\u0627\u06cc \u062a\u0639\u0631\u06cc\u0641 \u0645\u062a\u063a\u06cc\u0631\u0647\u0627 \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f\u060c \u0627\u0645\u0627 \u062a\u0641\u0627\u0648\u062a \u0622\u0646\u0647\u0627 \u0686\u06cc\u0633\u062a \u0648 \u0686\u0647 \u0632\u0645\u0627\u0646\u06cc \u0628\u0627\u06cc\u062f \u0627\u0632 \u0622\u0646\u0647\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f\u061f<\/p>\n<p>\u062f\u0631 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647 \u0628\u0627 \u062a\u0641\u0627\u0648\u062a \u06a9\u0644\u0645\u0627\u062a \u06a9\u0644\u06cc\u062f\u06cc var\u060c let \u0648 const \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0648 \u0628\u0631\u062e\u06cc \u0627\u0632 \u0645\u0632\u0627\u06cc\u0627 \u0648 \u0645\u0639\u0627\u06cc\u0628 \u0622\u0646\u0647\u0627 \u0622\u0634\u0646\u0627 \u062e\u0648\u0627\u0647\u06cc\u062f \u0634\u062f.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D9%85%D8%AA%D8%BA%DB%8C%D8%B1_%DA%86%DB%8C%D8%B3%D8%AA%D8%9F\"><\/span>\n<p>  \u0645\u062a\u063a\u06cc\u0631 \u0686\u06cc\u0633\u062a\u061f<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0645\u062a\u063a\u06cc\u0631 \u0645\u062d\u0641\u0638\u0647 \u0627\u06cc \u0628\u0631\u0627\u06cc \u0630\u062e\u06cc\u0631\u0647 \u0627\u0637\u0644\u0627\u0639\u0627\u062a \u0627\u0633\u062a.  \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0627\u0632 \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u0628\u0631\u0627\u06cc \u0630\u062e\u06cc\u0631\u0647 \u06cc\u06a9 \u0645\u0642\u062f\u0627\u0631 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f\u060c \u0645\u0627\u0646\u0646\u062f \u06cc\u06a9 \u0639\u062f\u062f\u060c \u06cc\u06a9 \u0631\u0634\u062a\u0647\u060c \u06cc\u06a9 \u0628\u0648\u0644\u06cc\u060c \u06cc\u06a9 \u0634\u06cc \u06cc\u0627 \u06cc\u06a9 \u062a\u0627\u0628\u0639.  \u0647\u0645\u0686\u0646\u06cc\u0646 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0627\u0632 \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u0628\u0631\u0627\u06cc \u0627\u0634\u0627\u0631\u0647 \u0628\u0647 \u0645\u0642\u062f\u0627\u0631\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f \u06a9\u0647 \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u062f\u0631 \u0637\u0648\u0644 \u0632\u0645\u0627\u0646 \u062a\u063a\u06cc\u06cc\u0631 \u06a9\u0646\u062f.<\/p>\n<p>\u0628\u0631\u0627\u06cc \u0627\u0639\u0644\u0627\u0645 \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a\u060c \u0628\u0627\u06cc\u062f \u0627\u0632 \u06cc\u06a9 \u06a9\u0644\u0645\u0647 \u06a9\u0644\u06cc\u062f\u06cc \u0648 \u0628\u0647 \u062f\u0646\u0628\u0627\u0644 \u0622\u0646 \u06cc\u06a9 \u0646\u0627\u0645 \u0628\u0631\u0627\u06cc \u0645\u062a\u063a\u06cc\u0631 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f.  \u0645\u062b\u0644\u0627:<\/p>\n<p>var x = 10;  \/\/ \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u0631\u0627 \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 var \u0627\u0639\u0644\u0627\u0645 \u06a9\u0646\u06cc\u062f<br \/>\u0627\u062c\u0627\u0632\u0647 \u062f\u0647\u06cc\u062f y = 20;  \/\/ \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u0631\u0627 \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 let \u0627\u0639\u0644\u0627\u0645 \u06a9\u0646\u06cc\u062f<br \/>const z = 30;  \/\/ \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u0631\u0627 \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 const \u0627\u0639\u0644\u0627\u0645 \u06a9\u0646\u06cc\u062f<\/p>\n<p>\u0646\u0627\u0645 \u0645\u062a\u063a\u06cc\u0631 \u0628\u0627\u06cc\u062f \u0627\u0632 \u0642\u0648\u0627\u0646\u06cc\u0646\u06cc \u067e\u06cc\u0631\u0648\u06cc \u06a9\u0646\u062f:<\/p>\n<p>\u2022 \u0628\u0627\u06cc\u062f \u0628\u0627 \u06cc\u06a9 \u062d\u0631\u0641 \u06cc\u0627 $ \u06cc\u0627 _ \u0634\u0631\u0648\u0639 \u0634\u0648\u062f.<\/p>\n<p>\u2022 \u0646\u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u062d\u0627\u0648\u06cc \u0641\u0627\u0635\u0644\u0647 \u06cc\u0627 \u0639\u0644\u0627\u0626\u0645 \u0646\u06af\u0627\u0631\u0634\u06cc \u0628\u0627\u0634\u062f (\u0628\u0647 \u062c\u0632 $ \u0648 _).<\/p>\n<p>\u2022 \u0646\u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u06cc\u06a9 \u06a9\u0644\u0645\u0647 \u0631\u0632\u0631\u0648 \u0634\u062f\u0647 \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0628\u0627\u0634\u062f\u060c \u0645\u0627\u0646\u0646\u062f var\u060c let\u060c const\u060c if\u060c for \u0648 \u063a\u06cc\u0631\u0647.<\/p>\n<p>\u2022 \u0628\u0647 \u062d\u0631\u0648\u0641 \u0628\u0632\u0631\u06af \u0648 \u06a9\u0648\u0686\u06a9 \u062d\u0633\u0627\u0633 \u0627\u0633\u062a\u060c \u0628\u0647 \u0627\u06cc\u0646 \u0645\u0639\u0646\u06cc \u06a9\u0647 x \u0648 X \u0645\u062a\u063a\u06cc\u0631\u0647\u0627\u06cc \u0645\u062a\u0641\u0627\u0648\u062a\u06cc \u0647\u0633\u062a\u0646\u062f.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D8%AA%D9%81%D8%A7%D9%88%D8%AA_%D8%A8%DB%8C%D9%86_var%D8%8C_let_%D9%88_const_%DA%86%DB%8C%D8%B3%D8%AA%D8%9F\"><\/span>\n<p>  \u062a\u0641\u0627\u0648\u062a \u0628\u06cc\u0646 var\u060c let \u0648 const \u0686\u06cc\u0633\u062a\u061f<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u062a\u0641\u0627\u0648\u062a \u0627\u0635\u0644\u06cc \u0628\u06cc\u0646 var\u060c let \u0648 const \u0627\u06cc\u0646 \u0627\u0633\u062a \u06a9\u0647 \u0686\u06af\u0648\u0646\u0647 \u0628\u0631 \u062f\u0627\u0645\u0646\u0647 \u0648 \u0627\u0641\u0632\u0627\u06cc\u0634 \u0645\u062a\u063a\u06cc\u0631\u0647\u0627 \u062a\u0623\u062b\u06cc\u0631 \u0645\u06cc \u06af\u0630\u0627\u0631\u0646\u062f.<\/p>\n<p><strong>\u0645\u062d\u062f\u0648\u062f\u0647<\/strong><br \/>\u0645\u062d\u062f\u0648\u062f\u0647 \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u0628\u062e\u0634\u06cc \u0627\u0632 \u06a9\u062f \u0627\u0633\u062a \u06a9\u0647 \u062f\u0631 \u0622\u0646 \u0645\u06cc \u062a\u0648\u0627\u0646 \u0628\u0647 \u0645\u062a\u063a\u06cc\u0631 \u062f\u0633\u062a\u0631\u0633\u06cc \u067e\u06cc\u062f\u0627 \u06a9\u0631\u062f \u06cc\u0627 \u0627\u0632 \u0622\u0646 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0631\u062f.  \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u062f\u0648 \u0646\u0648\u0639 \u062f\u0627\u0645\u0646\u0647 \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f: \u062f\u0627\u0645\u0646\u0647 \u062c\u0647\u0627\u0646\u06cc \u0648 \u062f\u0627\u0645\u0646\u0647 \u0645\u062d\u0644\u06cc.<\/p>\n<p>\u2022 \u062f\u0627\u0645\u0646\u0647 \u062c\u0647\u0627\u0646\u06cc: \u0645\u062a\u063a\u06cc\u0631\u06cc \u06a9\u0647 \u062f\u0631 \u062f\u0627\u0645\u0646\u0647 \u062c\u0647\u0627\u0646\u06cc \u0627\u0639\u0644\u0627\u0645 \u0634\u062f\u0647 \u0627\u0633\u062a \u0627\u0632 \u0647\u0631 \u0646\u0642\u0637\u0647 \u06a9\u062f \u0642\u0627\u0628\u0644 \u062f\u0633\u062a\u0631\u0633\u06cc \u0627\u0633\u062a.  \u0645\u062a\u063a\u06cc\u0631\u06cc \u06a9\u0647 \u062e\u0627\u0631\u062c \u0627\u0632 \u0647\u0631 \u062a\u0627\u0628\u0639 \u06cc\u0627 \u0628\u0644\u0648\u06a9\u06cc \u0627\u0639\u0644\u0627\u0645 \u0634\u062f\u0647 \u0627\u0633\u062a \u062f\u0631 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\u0627\u0633\u062a.<\/p>\n<p>\u062f\u0627\u0645\u0646\u0647 \u0645\u062a\u063a\u06cc\u0631\u06cc \u06a9\u0647 \u0628\u0627 var \u0627\u0639\u0644\u0627\u0645 \u0634\u062f\u0647 \u0627\u0633\u062a \u06cc\u0627 \u0633\u0631\u0627\u0633\u0631\u06cc \u0627\u0633\u062a \u06cc\u0627 \u0645\u0628\u062a\u0646\u06cc \u0628\u0631 \u062a\u0627\u0628\u0639.  \u0627\u06cc\u0646 \u0628\u062f\u0627\u0646 \u0645\u0639\u0646\u0627\u0633\u062a \u06a9\u0647 \u0627\u06af\u0631 \u0645\u062a\u063a\u06cc\u0631\u06cc \u0631\u0627 \u0628\u0627 var \u062f\u0631 \u062f\u0627\u062e\u0644 \u06cc\u06a9 \u062a\u0627\u0628\u0639 \u0627\u0639\u0644\u0627\u0645 \u06a9\u0646\u06cc\u062f\u060c \u0641\u0642\u0637 \u062f\u0631 \u0622\u0646 \u062a\u0627\u0628\u0639 \u0642\u0627\u0628\u0644 \u062f\u0633\u062a\u0631\u0633\u06cc \u0627\u0633\u062a.  \u0628\u0627 \u0627\u06cc\u0646 \u062d\u0627\u0644\u060c \u0627\u06af\u0631 \u0645\u062a\u063a\u06cc\u0631\u06cc \u0631\u0627 \u0628\u0627 var \u062f\u0631 \u062f\u0627\u062e\u0644 \u06cc\u06a9 \u0628\u0644\u0648\u06a9 \u0627\u0639\u0644\u0627\u0645 \u06a9\u0646\u06cc\u062f (\u0645\u0627\u0646\u0646\u062f \u06cc\u06a9 \u062f\u0633\u062a\u0648\u0631 if \u06cc\u0627 \u06cc\u06a9 \u062d\u0644\u0642\u0647 for)\u060c \u062e\u0627\u0631\u062c \u0627\u0632 \u0622\u0646 \u0628\u0644\u0648\u06a9 \u0646\u06cc\u0632 \u0642\u0627\u0628\u0644 \u062f\u0633\u062a\u0631\u0633\u06cc \u0627\u0633\u062a.<\/p>\n<p><\/p>\n<p>\u0645\u062b\u0644\u0627:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight plaintext\"><code>function foo() {\nvar x = 10; \/\/ Declare x with var inside foo function\nif (true) {\nvar y = 20; \/\/ Declare y with var inside if block\nconsole.log(x); \/\/ 10 (x is accessible inside if block)\nconsole.log(y); \/\/ 20 (y is accessible inside if block)\n}\nconsole.log(x); \/\/ 10 (x is accessible outside if block)\nconsole.log(y); \/\/ 20 (y is accessible outside if block)\n}\n\nfoo();\n\nconsole.log(x); \/\/ ReferenceError: x is not defined (x is not accessible outside foo function)\nconsole.log(y); \/\/ ReferenceError: y is not defined (y is not accessible outside foo function)\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u062f\u0627\u0645\u0646\u0647 \u0645\u062a\u063a\u06cc\u0631\u06cc \u06a9\u0647 \u0628\u0627 let \u06cc\u0627 const \u0627\u0639\u0644\u0627\u0645 \u0634\u062f\u0647 \u0627\u0633\u062a \u0645\u0628\u062a\u0646\u06cc \u0628\u0631 \u0628\u0644\u0648\u06a9 \u0627\u0633\u062a.  \u0627\u06cc\u0646 \u0628\u062f\u0627\u0646 \u0645\u0639\u0646\u0627\u0633\u062a \u06a9\u0647 \u0627\u06af\u0631 \u0645\u062a\u063a\u06cc\u0631\u06cc \u0631\u0627 \u0628\u0627 let \u06cc\u0627 const \u062f\u0631 \u062f\u0627\u062e\u0644 \u0647\u0631 \u0628\u0644\u0648\u06a9\u06cc (\u0645\u0627\u0646\u0646\u062f \u06cc\u06a9 \u062a\u0627\u0628\u0639\u060c \u06cc\u06a9 \u062f\u0633\u062a\u0648\u0631 if \u06cc\u0627 \u06cc\u06a9 \u062d\u0644\u0642\u0647 for) \u0627\u0639\u0644\u0627\u0645 \u06a9\u0646\u06cc\u062f\u060c \u0641\u0642\u0637 \u062f\u0631 \u0622\u0646 \u0628\u0644\u0648\u06a9 \u0642\u0627\u0628\u0644 \u062f\u0633\u062a\u0631\u0633\u06cc \u0627\u0633\u062a.<\/p>\n<p>\u0645\u062b\u0644\u0627:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight plaintext\"><code>function foo() {\nlet x = 10; \/\/ Declare x with let inside foo function\nconst z = 30; \/\/ Declare z with const inside foo function\nif (true) {\nlet y = 20; \/\/ Declare y with let inside if block\nconsole.log(x); \/\/ 10 (x is accessible inside if block)\nconsole.log(y); \/\/ 20 (y is accessible inside if block)\nconsole.log(z); \/\/ 30 (z is accessible inside if block)\n}\nconsole.log(x); \/\/ 10 (x is accessible outside if block)\nconsole.log(y); \/\/ ReferenceError: y is not defined (y is not accessible outside if block)\nconsole.log(z); \/\/ 30 (z is accessible outside if block)\n}\n\nfoo();\n\nconsole.log(x); \/\/ ReferenceError: x is not defined (x is not accessible outside foo function)\nconsole.log(y); \/\/ ReferenceError: y is not defined (y is not accessible outside foo function)\nconsole.log(z); \/\/ ReferenceError: z is not defined (z is not accessible outside foo function)\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0645\u062d\u062f\u0648\u062f\u0647 \u0645\u0628\u062a\u0646\u06cc \u0628\u0631 \u0628\u0644\u0648\u06a9 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0627\u0632 \u0646\u0634\u062a \u062a\u0635\u0627\u062f\u0641\u06cc \u0648 \u062f\u0631\u06af\u06cc\u0631\u06cc \u0645\u062a\u063a\u06cc\u0631\u0647\u0627\u06cc\u06cc \u0628\u0627 \u0646\u0627\u0645 \u06cc\u06a9\u0633\u0627\u0646 \u062f\u0631 \u0628\u0644\u0648\u06a9 \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc \u06a9\u0646\u062f.<\/p>\n<p>\u0628\u0627\u0644\u0627 \u0628\u0631\u062f\u0646<br \/>Hoisting \u0645\u06a9\u0627\u0646\u06cc\u0632\u0645\u06cc \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0627\u0633\u062a \u06a9\u0647 \u0627\u0639\u0644\u0627\u0646 \u0647\u0627\u06cc \u0645\u062a\u063a\u06cc\u0631\u0647\u0627 \u0631\u0627 \u0642\u0628\u0644 \u0627\u0632 \u0627\u062c\u0631\u0627\u06cc \u0647\u0631 \u06a9\u062f\u06cc \u0628\u0647 \u0628\u0627\u0644\u0627\u06cc \u0645\u062d\u062f\u0648\u062f\u0647 \u0622\u0646\u0647\u0627 \u0645\u0646\u062a\u0642\u0644 \u0645\u06cc \u06a9\u0646\u062f.  \u0627\u06cc\u0646 \u0628\u0647 \u0627\u06cc\u0646 \u0645\u0639\u0646\u06cc \u0627\u0633\u062a \u06a9\u0647 \u0634\u0645\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0627\u0632 \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u0642\u0628\u0644 \u0627\u0632 \u0627\u0639\u0644\u0627\u0645 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f\u060c \u0627\u0645\u0627 \u0645\u0642\u062f\u0627\u0631 \u0627\u0648\u0644\u06cc\u0647 \u0622\u0646 \u062a\u0639\u0631\u06cc\u0641 \u0646\u0634\u062f\u0647 \u0627\u0633\u062a.<\/p>\n<p>\u0628\u0627\u0644\u0627 \u0628\u0631\u062f\u0646 \u0628\u0647 \u0637\u0648\u0631 \u0645\u062a\u0641\u0627\u0648\u062a\u06cc \u0628\u0631\u0627\u06cc \u0645\u062a\u063a\u06cc\u0631\u0647\u0627\u06cc \u0627\u0639\u0644\u0627\u0645 \u0634\u062f\u0647 \u0628\u0627 var\u060c let \u0648 const \u0627\u0639\u0645\u0627\u0644 \u0645\u06cc \u0634\u0648\u062f.<\/p>\n<p>\u0645\u062a\u063a\u06cc\u0631\u0647\u0627\u06cc \u0627\u0639\u0644\u0627\u0645 \u0634\u062f\u0647 \u0628\u0627 var \u062f\u0631 \u0628\u0627\u0644\u0627\u06cc \u0645\u062d\u062f\u0648\u062f\u0647 \u062e\u0648\u062f\u060c \u0686\u0647 \u0633\u0631\u0627\u0633\u0631\u06cc \u06cc\u0627 \u0645\u0628\u062a\u0646\u06cc \u0628\u0631 \u062a\u0627\u0628\u0639\u060c \u0628\u0627\u0644\u0627 \u0645\u06cc \u0631\u0648\u0646\u062f.  \u0627\u06cc\u0646 \u0628\u062f\u0627\u0646 \u0645\u0639\u0646\u06cc \u0627\u0633\u062a \u06a9\u0647 \u0634\u0645\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0642\u0628\u0644 \u0627\u0632 \u0627\u0639\u0644\u0627\u0645 \u0622\u0646\u0647\u0627 \u0627\u0632 \u0622\u0646\u0647\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f\u060c \u0627\u0645\u0627 \u0645\u0642\u062f\u0627\u0631 \u0627\u0648\u0644\u06cc\u0647 \u0622\u0646\u0647\u0627 \u062a\u0639\u0631\u06cc\u0641 \u0646\u0634\u062f\u0647 \u0627\u0633\u062a.<\/p>\n<p>\u0645\u062b\u0644\u0627:<\/p>\n<p>console.log(x);  \/\/ \u062a\u0639\u0631\u06cc\u0641 \u0646\u0634\u062f\u0647 (x \u0627\u0641\u0632\u0627\u06cc\u0634 \u06cc\u0627\u0641\u062a\u0647 \u0627\u0633\u062a \u0627\u0645\u0627 \u0627\u0648\u0644\u06cc\u0647 \u0646\u0634\u062f\u0647 \u0627\u0633\u062a)<br \/>var x = 10;<br \/>console.log(x);  \/\/ 10<\/p>\n<p>\u0645\u062a\u063a\u06cc\u0631\u0647\u0627\u06cc \u0627\u0639\u0644\u0627\u0645 \u0634\u062f\u0647 \u0628\u0627 let \u06cc\u0627 const \u0646\u06cc\u0632 \u062f\u0631 \u0628\u0627\u0644\u0627\u06cc \u0645\u062d\u062f\u0648\u062f\u0647 \u062e\u0648\u062f \u0642\u0631\u0627\u0631 \u0645\u06cc \u06af\u06cc\u0631\u0646\u062f\u060c \u0627\u0645\u0627 \u062a\u0627 \u0632\u0645\u0627\u0646\u06cc \u06a9\u0647 \u0627\u0639\u0644\u0627\u0646 \u0646\u0634\u062f\u0647 \u0628\u0627\u0634\u0646\u062f\u060c \u0645\u0642\u062f\u0627\u0631\u062f\u0647\u06cc \u0627\u0648\u0644\u06cc\u0647 \u0646\u0645\u06cc \u0634\u0648\u0646\u062f.  \u0627\u06cc\u0646 \u0628\u062f\u0627\u0646 \u0645\u0639\u0646\u0627\u0633\u062a \u06a9\u0647 \u0634\u0645\u0627 \u0646\u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0642\u0628\u0644 \u0627\u0632 \u0627\u0639\u0644\u0627\u0645 \u0622\u0646\u0647\u0627 \u0627\u0632 \u0622\u0646\u0647\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f \u0648 \u0628\u0627 \u062e\u0637\u0627\u06cc \u0645\u0631\u062c\u0639 \u0645\u0648\u0627\u062c\u0647 \u062e\u0648\u0627\u0647\u06cc\u062f \u0634\u062f.<\/p>\n<p>\u0645\u062b\u0644\u0627:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight plaintext\"><code>console.log(x); \/\/ ReferenceError: Cannot access 'x' before initialization (x is hoisted but not initialized)\nlet x = 10;\nconsole.log(x); \/\/ 10\n\nconsole.log(y); \/\/ ReferenceError: Cannot access 'y' before initialization (y is hoisted but not initialized)\nconst y = 20;\nconsole.log(y); \/\/ 20\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0627\u06cc\u0646 \u0631\u0641\u062a\u0627\u0631 \u06cc\u06a9 \u0645\u0646\u0637\u0642\u0647 \u0645\u0631\u062f\u0647 \u0645\u0648\u0642\u062a\u06cc \u0628\u06cc\u0646 hoisting \u0648 \u0645\u0642\u062f\u0627\u0631\u062f\u0647\u06cc \u0627\u0648\u0644\u06cc\u0647 \u0645\u062a\u063a\u06cc\u0631\u0647\u0627\u06cc \u0627\u0639\u0644\u0627\u0645 \u0634\u062f\u0647 \u0628\u0627 let \u06cc\u0627 const \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc \u06a9\u0646\u062f.  \u0627\u06cc\u0646 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0627\u0632 \u062e\u0637\u0627\u0647\u0627 \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc \u06a9\u0631\u062f\u0647 \u0648 \u0634\u06cc\u0648\u0647 \u0647\u0627\u06cc \u06a9\u062f\u06af\u0630\u0627\u0631\u06cc \u062e\u0648\u0628 \u0631\u0627 \u0627\u0639\u0645\u0627\u0644 \u06a9\u0646\u062f.<\/p>\n<p>\u0686\u0647 \u0632\u0645\u0627\u0646\u06cc \u0627\u0632 var\u060c let \u0648 const \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u0645\u061f<br \/>\u0647\u0645\u0627\u0646\u0637\u0648\u0631 \u06a9\u0647 \u0645\u0634\u0627\u0647\u062f\u0647 \u06a9\u0631\u062f\u06cc\u062f\u060c \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 var\u060c let \u0648 const \u0628\u0631\u0627\u06cc \u0627\u0639\u0644\u0627\u0646 \u0645\u062a\u063a\u06cc\u0631\u0647\u0627 \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u062f\u0627\u0631\u0627\u06cc \u0645\u0632\u0627\u06cc\u0627 \u0648 \u0645\u0639\u0627\u06cc\u0628\u06cc \u0627\u0633\u062a.  \u067e\u0633 \u0686\u0647 \u0632\u0645\u0627\u0646\u06cc \u0628\u0627\u06cc\u062f \u0627\u0632 \u0622\u0646\u0647\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f\u061f<\/p>\n<p>\u062a\u0648\u0635\u06cc\u0647 \u06a9\u0644\u06cc \u0627\u06cc\u0646 \u0627\u0633\u062a \u06a9\u0647 \u0627\u0632 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 var \u062e\u0648\u062f\u062f\u0627\u0631\u06cc \u06a9\u0646\u06cc\u062f \u0645\u06af\u0631 \u0627\u06cc\u0646\u06a9\u0647 \u062f\u0644\u06cc\u0644 \u062e\u0627\u0635\u06cc \u0628\u0631\u0627\u06cc \u0627\u06cc\u0646 \u06a9\u0627\u0631 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f.  \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 var \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0628\u0627\u0639\u062b \u0633\u0631\u062f\u0631\u06af\u0645\u06cc \u0648 \u062e\u0637\u0627 \u0628\u0647 \u062f\u0644\u06cc\u0644 \u062f\u0627\u0645\u0646\u0647 \u0639\u0645\u0644\u06a9\u0631\u062f \u0648 \u0631\u0641\u062a\u0627\u0631 \u0628\u0627\u0644\u0627\u0628\u0631 \u0622\u0646 \u0634\u0648\u062f.<\/p>\n<p>\u062f\u0631 \u0639\u0648\u0636\u060c \u0628\u0627\u06cc\u062f \u0627\u0632 let \u06cc\u0627 const \u0628\u0631\u0627\u06cc \u0627\u0639\u0644\u0627\u0645 \u0645\u062a\u063a\u06cc\u0631\u0647\u0627\u06cc\u06cc \u0628\u0627 \u0645\u062d\u062f\u0648\u062f\u0647 \u0645\u0628\u062a\u0646\u06cc \u0628\u0631 \u0628\u0644\u0648\u06a9 \u0648 \u0645\u0646\u0637\u0642\u0647 \u0645\u0631\u062f\u0647 \u0632\u0645\u0627\u0646\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f.  \u0627\u06cc\u0646 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0627\u0632 \u0646\u0634\u062a \u062a\u0635\u0627\u062f\u0641\u06cc \u0648 \u062f\u0631\u06af\u06cc\u0631\u06cc \u0645\u062a\u063a\u06cc\u0631\u0647\u0627 \u0628\u0627 \u0628\u0644\u0648\u06a9 \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc \u06a9\u0646\u062f.<\/p>\n<p>\u062a\u0641\u0627\u0648\u062a \u0627\u0635\u0644\u06cc \u0628\u06cc\u0646 let \u0648 const \u0627\u06cc\u0646 \u0627\u0633\u062a \u06a9\u0647 let \u0628\u0647 \u0634\u0645\u0627 \u0627\u062c\u0627\u0632\u0647 \u0645\u06cc \u062f\u0647\u062f \u062a\u0627 \u0645\u0642\u062f\u0627\u0631 \u0645\u062a\u063a\u06cc\u0631 \u0631\u0627 \u067e\u0633 \u0627\u0632 \u0627\u0639\u0644\u0627\u0645 \u062a\u063a\u06cc\u06cc\u0631 \u062f\u0647\u06cc\u062f\u060c \u062f\u0631 \u062d\u0627\u0644\u06cc \u06a9\u0647 const \u0627\u06cc\u0646 \u06a9\u0627\u0631 \u0631\u0627 \u0646\u0645\u06cc \u06a9\u0646\u062f.  \u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u0645\u06cc \u062e\u0648\u0627\u0647\u06cc\u062f \u0645\u0642\u062f\u0627\u0631 \u062b\u0627\u0628\u062a\u06cc \u0631\u0627 \u06a9\u0647 \u062a\u063a\u06cc\u06cc\u0631 \u0646\u0645\u06cc \u06a9\u0646\u062f\u060c \u0627\u0639\u0644\u0627\u0645 \u06a9\u0646\u06cc\u062f\u060c \u0628\u0627\u06cc\u062f \u0627\u0632 const \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f\u060c \u0645\u0627\u0646\u0646\u062f:<\/p>\n<p>\u2022 \u06cc\u06a9 \u0645\u0642\u062f\u0627\u0631 \u0627\u0648\u0644\u06cc\u0647 \u0645\u0627\u0646\u0646\u062f \u06cc\u06a9 \u0639\u062f\u062f \u06cc\u0627 \u06cc\u06a9 \u0631\u0634\u062a\u0647.<\/p>\n<p>\u2022 \u0627\u0631\u062c\u0627\u0639 \u0628\u0647 \u06cc\u06a9 \u0634\u06cc \u06cc\u0627 \u0622\u0631\u0627\u06cc\u0647 \u0627\u06cc \u06a9\u0647 \u0647\u0645\u06cc\u0634\u0647 \u0628\u0647 \u0647\u0645\u0627\u0646 \u0634\u06cc \u06cc\u0627 \u0622\u0631\u0627\u06cc\u0647 \u0627\u0634\u0627\u0631\u0647 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<p>\u2022 \u06cc\u06a9 \u0639\u0628\u0627\u0631\u062a \u062a\u0627\u0628\u0639 \u06cc\u0627 \u06cc\u06a9 \u062a\u0627\u0628\u0639 \u0641\u0644\u0634.<\/p>\n<p>\u0632\u0645\u0627\u0646\u06cc \u06a9\u0647 \u0645\u06cc \u062e\u0648\u0627\u0647\u06cc\u062f \u0645\u062a\u063a\u06cc\u0631\u06cc \u0631\u0627 \u06a9\u0647 \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u062f\u0631 \u0637\u0648\u0644 \u0632\u0645\u0627\u0646 \u062a\u063a\u06cc\u06cc\u0631 \u06a9\u0646\u062f\u060c \u0627\u0639\u0644\u0627\u0645 \u06a9\u0646\u06cc\u062f\u060c \u0628\u0627\u06cc\u062f \u0627\u0632 let \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f\u060c \u0645\u0627\u0646\u0646\u062f:<\/p>\n<p>\u2022 \u0634\u0645\u0627\u0631\u0646\u062f\u0647 \u06cc\u0627 \u062a\u06a9\u0631\u0627\u0631 \u06a9\u0646\u0646\u062f\u0647 \u062f\u0631 \u06cc\u06a9 \u062d\u0644\u0642\u0647.<\/p>\n<p>\u2022 \u06cc\u06a9 \u0645\u0642\u062f\u0627\u0631 \u0645\u0648\u0642\u062a \u062f\u0631 \u06cc\u06a9 \u0627\u0644\u06af\u0648\u0631\u06cc\u062a\u0645.<\/p>\n<p>\u2022 \u06cc\u06a9 \u0645\u0642\u062f\u0627\u0631 \u062a\u062e\u0635\u06cc\u0635 \u0634\u0631\u0637\u06cc \u062f\u0631 \u06cc\u06a9 \u0639\u0628\u0627\u0631\u062a if-else.<\/p>\n<p>\u062f\u0631 \u0627\u06cc\u0646\u062c\u0627 \u0686\u0646\u062f \u0646\u0645\u0648\u0646\u0647 \u0627\u0632 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 let \u0648 const \u0622\u0648\u0631\u062f\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight plaintext\"><code>\/\/ Use const for primitive values that will not change\nconst PI = 3.14;\nconst NAME = \"John\";\n\n\/\/ Use const for references to objects or arrays that will always point to the same object or array\nconst person = {name: \"John\", age: 25};\nconst numbers = [1, 2, 3];\n\n\/\/ Use const for function expressions or arrow functions\nconst add = function(a,b) {\nreturn a + b;\n};\n\nconst multiply = (a,b) =&gt; {\nreturn a * b;\n};\n\n\/\/ Use let for counters or iterators in loops\nfor (let i = 0\ni &lt; 10; i++) {\nconsole.log(i); \/\/ 0, 1, 2, ..., 9\n}\n\n\/\/ Use let for temporary values in algorithms\nlet a = 10;\nlet b = 20;\nlet temp = a; \/\/ Use temp to swap the values of a and b\na = b;\nb = temp;\n\n\/\/ Use let for conditionally assigned values in if-else statements\nlet greeting;\nif (hour &lt; 12) {\ngreeting = \"Good morning\";\n} else {\ngreeting = \"Good afternoon\";\n}\n\nconsole.log(greeting); \/\/ Depends on the value of hour\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"%D9%86%D8%AA%DB%8C%D8%AC%D9%87\"><\/span>\n<p>  \u0646\u062a\u06cc\u062c\u0647<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u062f\u0631 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647 \u0628\u0627 \u062a\u0641\u0627\u0648\u062a \u0628\u06cc\u0646 \u0622\u0646\u0647\u0627 \u0622\u0634\u0646\u0627 \u0634\u062f\u06cc\u062f <code>var<\/code>\u060c <code>let<\/code>\u060c \u0648 <code>const<\/code> \u06a9\u0644\u0645\u0627\u062a \u06a9\u0644\u06cc\u062f\u06cc \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0648 \u0632\u0645\u0627\u0646 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0622\u0646\u0647\u0627  \u06cc\u0627\u062f \u06af\u0631\u0641\u062a\u06cc \u06a9\u0647:<\/p>\n<p>\u2022  <code>var<\/code> \u0645\u062a\u063a\u06cc\u0631\u06cc \u0631\u0627 \u0628\u0627 \u062f\u0627\u0645\u0646\u0647 \u062a\u0627\u0628\u0639 \u06cc\u0627 \u062f\u0627\u0645\u0646\u0647 \u062c\u0647\u0627\u0646\u06cc \u0627\u0639\u0644\u0627\u0645 \u0645\u06cc\u200c\u06a9\u0646\u062f \u0648 \u0628\u0627 \u0645\u0642\u062f\u0627\u0631 \u0627\u0648\u0644\u06cc\u0647 \u0622\u0646 \u0628\u0647 \u0628\u0627\u0644\u0627\u06cc \u0645\u062d\u062f\u0648\u062f\u0647 \u0622\u0646 \u0628\u0627\u0644\u0627 \u0645\u06cc\u200c\u0631\u0648\u062f. <code>undefined<\/code>.<\/p>\n<p>\u2022  <code>let<\/code> \u0648 <code>const<\/code> \u0645\u062a\u063a\u06cc\u0631\u0647\u0627 \u0631\u0627 \u0628\u0627 \u0645\u062d\u062f\u0648\u062f\u0647 \u0628\u0644\u0648\u06a9 \u0627\u0639\u0644\u0627\u0646 \u0645\u06cc \u06a9\u0646\u0646\u062f\u060c \u0648 \u0622\u0646\u0647\u0627 \u0631\u0627 \u062a\u0627 \u0628\u0627\u0644\u0627\u06cc \u0645\u062d\u062f\u0648\u062f\u0647 \u062e\u0648\u062f \u0628\u0627\u0644\u0627 \u0645\u06cc \u0628\u0631\u0646\u062f\u060c \u0627\u0645\u0627 \u062a\u0627 \u0632\u0645\u0627\u0646\u06cc \u06a9\u0647 \u0627\u0639\u0644\u0627\u0646 \u0646\u0634\u062f\u0647 \u0628\u0627\u0634\u0646\u062f\u060c \u0645\u0642\u062f\u0627\u0631\u062f\u0647\u06cc \u0627\u0648\u0644\u06cc\u0647 \u0646\u0645\u06cc \u0634\u0648\u0646\u062f.<\/p>\n<p>\u2022 \u0628\u0627\u06cc\u062f \u0627\u0632 \u0645\u0635\u0631\u0641 \u062e\u0648\u062f\u062f\u0627\u0631\u06cc \u06a9\u0646\u06cc\u062f <code>var<\/code> \u0645\u06af\u0631 \u0627\u06cc\u0646\u06a9\u0647 \u062f\u0644\u06cc\u0644 \u062e\u0627\u0635\u06cc \u0628\u0631\u0627\u06cc \u0627\u06cc\u0646 \u06a9\u0627\u0631 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f \u0648 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f <code>let<\/code> \u06cc\u0627 <code>const<\/code> \u0628\u062c\u0627\u06cc.<\/p>\n<p>\u2022 \u0628\u0627\u06cc\u062f \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f <code>const<\/code> \u0648\u0642\u062a\u06cc \u0645\u06cc \u062e\u0648\u0627\u0647\u06cc\u062f \u0645\u0642\u062f\u0627\u0631 \u062b\u0627\u0628\u062a\u06cc \u0631\u0627 \u06a9\u0647 \u062a\u063a\u06cc\u06cc\u0631 \u0646\u0645\u06cc \u06a9\u0646\u062f \u0627\u0639\u0644\u0627\u0645 \u06a9\u0646\u06cc\u062f \u0648 \u0627\u0632 \u0622\u0646 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f <code>let<\/code> \u0632\u0645\u0627\u0646\u06cc \u06a9\u0647 \u0645\u06cc \u062e\u0648\u0627\u0647\u06cc\u062f \u0645\u062a\u063a\u06cc\u0631\u06cc \u0631\u0627 \u0627\u0639\u0644\u0627\u0645 \u06a9\u0646\u06cc\u062f \u06a9\u0647 \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u062f\u0631 \u0637\u0648\u0644 \u0632\u0645\u0627\u0646 \u062a\u063a\u06cc\u06cc\u0631 \u06a9\u0646\u062f.<\/p>\n<p>\u0627\u0645\u06cc\u062f\u0648\u0627\u0631\u0645 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647 \u0628\u0647 \u0634\u0645\u0627 \u062f\u0631 \u062f\u0631\u06a9 \u062a\u0641\u0627\u0648\u062a \u0628\u06cc\u0646 \u0622\u0646\u0647\u0627 \u06a9\u0645\u06a9 \u06a9\u0646\u062f <code>var<\/code>\u060c <code>let<\/code>\u060c \u0648 <code>const<\/code> \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a  \u0627\u06af\u0631 \u0633\u0624\u0627\u0644 \u06cc\u0627 \u0628\u0627\u0632\u062e\u0648\u0631\u062f\u06cc \u062f\u0627\u0631\u06cc\u062f\u060c \u0644\u0637\u0641\u0627\u064b \u062f\u0631 \u0632\u06cc\u0631 \u0646\u0638\u0631 \u062f\u0647\u06cc\u062f.  \u0628\u0627 \u062a\u0634\u06a9\u0631 \u0628\u0631\u0627\u06cc \u062e\u0648\u0627\u0646\u062f\u0646! \u0633\u0631\u062e \u0634\u062f\u0646<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>var\u060c let \u0648 const: \u062a\u0641\u0627\u0648\u062a \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0686\u06cc\u0633\u062a\u061f \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u06cc\u06a9 \u0632\u0628\u0627\u0646 \u067e\u0648\u06cc\u0627 \u0648 \u0627\u0646\u0639\u0637\u0627\u0641 \u067e\u0630\u06cc\u0631 \u0627\u0633\u062a \u06a9\u0647 \u0628\u0647 \u0634\u0645\u0627 \u0627\u0645\u06a9\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f \u0645\u062a\u063a\u06cc\u0631\u0647\u0627 \u0631\u0627 \u0628\u0647 \u0631\u0648\u0634 \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u0627\u0639\u0644\u0627\u0645 \u06a9\u0646\u06cc\u062f. \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0627\u0632 \u06a9\u0644\u0645\u0627\u062a \u06a9\u0644\u06cc\u062f\u06cc var\u060c let \u06cc\u0627 const \u0628\u0631\u0627\u06cc \u062a\u0639\u0631\u06cc\u0641 \u0645\u062a\u063a\u06cc\u0631\u0647\u0627 \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f\u060c \u0627\u0645\u0627 \u062a\u0641\u0627\u0648\u062a \u0622\u0646\u0647\u0627 \u0686\u06cc\u0633\u062a \u0648 \u0686\u0647 &hellip;<\/p>\n","protected":false},"author":2,"featured_media":25427,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[339],"tags":[],"class_list":["post-25426","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dev"],"_links":{"self":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/25426","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/comments?post=25426"}],"version-history":[{"count":0,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/25426\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media\/25427"}],"wp:attachment":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media?parent=25426"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/categories?post=25426"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/tags?post=25426"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}