{"id":3681,"date":"2023-04-20T21:38:42","date_gmt":"2023-04-20T14:38:42","guid":{"rendered":"https:\/\/laoitdev.com\/?p=3681"},"modified":"2024-02-07T20:56:51","modified_gmt":"2024-02-07T13:56:51","slug":"javascript-ep2-hoisting","status":"publish","type":"post","link":"https:\/\/laoitdev.com\/lao\/2023\/3681\/","title":{"rendered":"JavaScript EP2: Hoisting\u00a0"},"content":{"rendered":"<p>Hoisting \u2014 JS Developer \u0eab\u0ebc\u0eb2\u0e8d\u0e84\u0ebb\u0e99\u0e81\u0ecd\u0ec8\u0e84\u0ebb\u0e87\u0e84\u0eb8\u0ec9\u0e99\u0eab\u0eb9\u0e81\u0eb1\u0e9a\u0e84\u0eb3\u0e99\u0eb5\u0ec9\u0ea2\u0eb9\u0ec8\u0e9a\u0ecd\u0ec8\u0edc\u0ec9\u0ead\u0e8d\u0ec0\u0e99\u0eb7\u0ec8\u0ead\u0e87\u0e88\u0eb2\u0e81\u0eab\u0ebc\u0eb2\u0e8d\u0ec6\u0ec0\u0e97\u0eb7\u0ec8\u0ead\u0e97\u0eb5\u0ec8\u0ec4\u0e9b\u0e84\u0ebb\u0ec9\u0e99\u0ea7\u0eb4\u0e97\u0eb5\u0ec1\u0e81\u0ec9 error \u0ea2\u0eb9\u0ec8 google \u0ea1\u0eb1\u0e81\u0e88\u0eb0\u0ec0\u0eab\u0eb1\u0e99\u0e84\u0ebb\u0e99\u0ea1\u0eb2\u0e9a\u0ead\u0e81\u0ea7\u0ec8\u0eb2 error \u0e99\u0eb5\u0ec9\u0ec0\u0e81\u0eb5\u0e94\u0e88\u0eb2\u0e81 hoisting, \u0ec1\u0e95\u0ec8 hoisting \u0ea1\u0eb1\u0e99\u0ec1\u0ea1\u0ec8\u0e99\u0ec1\u0e9a\u0ec9\u0eab\u0e8d\u0eb1\u0e87\u0ea5\u0ec8\u0eb0? \u0e94\u0ebd\u0ea7\u0e9a\u0ebb\u0e94\u0e84\u0ea7\u0eb2\u0ea1\u0e99\u0eb5\u0ec9\u0e88\u0eb0\u0ea1\u0eb2\u0ead\u0eb0\u0e97\u0eb4\u0e9a\u0eb2\u0e8d\u0ea7\u0ec8\u0eb2\u0ec1\u0e9a\u0ec9\u0ead\u0eb5\u0ec8\u0eab\u0e8d\u0eb1\u0e87\u0e84\u0eb7 hoisting.<\/p>\n\n\n\n<p>\u0e95\u0ead\u0e99\u0e97\u0eb5\u0ec8\u0ec0\u0ea5\u0eb5\u0ec8\u0ea1\u0e82\u0ebd\u0e99 JavaScript \u0e8a\u0ec8\u0ea7\u0e87\u0ec1\u0ea5\u0e81\u0ec6\u0e81\u0ecd\u0ec8\u0ec0\u0e84\u0eb5\u0e8d\u0e9e\u0ecd\u0ec9\u0ec0\u0eab\u0e94\u0e81\u0eb2\u0e99\u0e97\u0eb5\u0ec8\u0ea7\u0ec8\u0eb2 variable \u0e9a\u0eb2\u0e87\u0ec2\u0e95\u0ea1\u0eb1\u0e99\u00a0<code>undefined<\/code>\u00a0\u0ec1\u0e9a\u0e9a\u0e87\u0ebb\u0e87\u0ec6, \u0e96\u0eb7\u0e81\u0ec2\u0e8d\u0e99\u00a0<code>ReferenceErrors<\/code>\u00a0\u0ec3\u0eaa\u0ec8\u0edc\u0ec9\u0eb2 \u0ec1\u0ea5\u0eb0 \u0ead\u0eb5\u0e81\u0e9a\u0eb1\u0e99\u0eab\u0eb2\u0ead\u0eb7\u0ec8\u0e99\u0ec6. Hoisting \u0ea1\u0eb1\u0e81\u0e96\u0eb7\u0e81\u0eab\u0ebc\u0eb2\u0e8d\u0e84\u0ebb\u0e99\u0ead\u0eb0\u0e97\u0eb4\u0e9a\u0eb2\u0e8d\u0ea7\u0ec8\u0eb2\u0ec0\u0e9b\u0eb1\u0e99\u0e81\u0eb2\u0e99\u0ec3\u0eaa\u0ec8\u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99 \u0ec1\u0ea5\u0eb0 function \u0ec4\u0ea7\u0ec9\u0ea2\u0eb9\u0ec8\u0ec0\u0e97\u0eb4\u0e87\u0eaa\u0eb8\u0e94\u0e82\u0ead\u0e87\u0ec4\u0e9f\u0ea5\u0ecc, \u0ec1\u0e95\u0ec8\u0ea7\u0ec8\u0eb2 \u0ea1\u0eb1\u0e99\u0ec1\u0ea1\u0ec8\u0e99\u0ec1\u0e9a\u0e9a\u0e99\u0eb1\u0ec9\u0e99\u0ec1\u0e97\u0ec9\u0e9a\u0ecd\u0ec8\u0ea5\u0ec8\u0eb0? \u0ec3\u0e88\u0ec0\u0ea2\u0eb1\u0e99\u0e81\u0ec8\u0ead\u0e99\u0ec4\u0e9a\u0ea3\u0ecc\u0ead\u0eb1\u0e99\u0ea1\u0eb1\u0e99\u0e9a\u0ecd\u0ec8\u0ec1\u0ea1\u0ec8\u0e99\u0ec1\u0e9a\u0e9a\u0e99\u0eb1\u0ec9\u0e99\u0ec0\u0ea5\u0eb5\u0e8d, \u0ea1\u0eb1\u0e99\u0e9a\u0ecd\u0ec8\u0ec1\u0ea1\u0ec8\u0e99\u0eaa\u0eb2\u0ec0\u0eab\u0e94\u0e82\u0ead\u0e87\u0eaa\u0eb4\u0ec8\u0e87\u0e97\u0eb5\u0ec8\u0ec0\u0e81\u0eb5\u0e94\u0e82\u0eb6\u0ec9\u0e99 \u0ec0\u0e96\u0eb4\u0e87\u0ea1\u0eb1\u0e99\u0e8a\u0eb4\u0ec0\u0e9a\u0eb4\u0ec8\u0e87\u0e84\u0eb7\u0ea7\u0ec8\u0eb2\u0ea1\u0eb1\u0e99\u0edc\u0ec9\u0eb2\u0e88\u0eb0\u0ec0\u0e9b\u0eb1\u0e99\u0ec1\u0e9a\u0e9a\u0e99\u0eb1\u0ec9\u0e99\u0e81\u0ecd\u0ec8\u0e95\u0eb2\u0ea1.<\/p>\n\n\n\n<p>\u0ec0\u0ea1\u0eb7\u0ec8\u0ead JavaScript Engine \u0ec0\u0ea5\u0eb5\u0ec8\u0ea1\u0ec0\u0eae\u0eb1\u0e94\u0ea7\u0ebd\u0e81\u0e81\u0eb1\u0e9a script \u0e97\u0eb5\u0ec8\u0ec0\u0eae\u0ebb\u0eb2\u0e82\u0ebd\u0e99 \u0eaa\u0eb4\u0ec8\u0e87\u0e97\u0eb3\u0ead\u0eb4\u0e94\u0e97\u0eb5\u0ec8\u0ea1\u0eb1\u0e99\u0ec0\u0eae\u0eb1\u0e94\u0e81\u0ecd\u0ec8\u0e84\u0eb7\u0e81\u0eb2\u0e99\u0e95\u0eb1\u0ec9\u0e87\u0e84\u0ec8\u0eb2 memory \u0eaa\u0eb3\u0ea5\u0eb1\u0e9a data \u0ec3\u0e99 code \u0e82\u0ead\u0e87\u0ec0\u0eae\u0ebb\u0eb2. \u0e88\u0eb0\u0e8d\u0eb1\u0e87\u0e9a\u0ecd\u0ec8\u0ea1\u0eb5\u0e81\u0eb2\u0e99 execute \u0ec3\u0e94\u0ec6\u0ec3\u0e99\u0e82\u0eb1\u0ec9\u0e99\u0e95\u0ead\u0e99\u0e99\u0eb5\u0ec9\u0ec0\u0e97\u0eb7\u0ec8\u0ead \u0ec0\u0ea7\u0ebb\u0ec9\u0eb2\u0e87\u0ec8\u0eb2\u0e8d\u0ec6\u0e81\u0ecd\u0ec8\u0e84\u0eb7\u0ea1\u0eb1\u0e99\u0ec0\u0e9b\u0eb1\u0e99\u0e9e\u0ebd\u0e87\u0e81\u0eb2\u0e99\u0e81\u0eb0\u0e81\u0ebd\u0ea1\u0e97\u0eb8\u0e81\u0ea2\u0ec8\u0eb2\u0e87\u0eaa\u0eb3\u0ea5\u0eb1\u0e9a\u0e81\u0eb2\u0e99 execution. \u0ea7\u0eb4\u0e97\u0eb5\u0e81\u0eb2\u0e99\u0ec3\u0e99\u0e81\u0eb2\u0e99 store \u0eaa\u0ec8\u0ea7\u0e99\u0e82\u0ead\u0e87 function \u0ec1\u0ea5\u0eb0 \u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99\u0e99\u0eb1\u0ec9\u0e99\u0ec1\u0e95\u0e81\u0e95\u0ec8\u0eb2\u0e87\u0e81\u0eb1\u0e99, function \u0e88\u0eb0\u0e96\u0eb7\u0e81 store \u0ec4\u0ea7\u0ec9\u0ec2\u0e94\u0e8d\u0ead\u0ec9\u0eb2\u0e87\u0ead\u0eb5\u0e87 function \u0e97\u0eb1\u0e87\u0edd\u0ebb\u0e94.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"405\" src=\"https:\/\/laoitdev.com\/wp-content\/uploads\/2023\/04\/2.gif\" alt=\"\" class=\"wp-image-3683\"\/><\/figure>\n\n\n\n<p>\u0eaa\u0ec8\u0ea7\u0e99\u0e82\u0ead\u0e87\u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99\u0e88\u0eb0\u0ea1\u0eb5\u0e88\u0eb8\u0e94\u0e97\u0eb5\u0ec8\u0ec1\u0e95\u0e81\u0e95\u0ec8\u0eb2\u0e87\u0ea2\u0eb9\u0ec8\u0edc\u0ec9\u0ead\u0e8d\u0edc\u0eb6\u0ec8\u0e87\u0e84\u0eb7: \u0ec3\u0e99 ES6+ \u0e88\u0eb0\u0ea1\u0eb5\u0e81\u0eb2\u0e99\u0e9b\u0eb0\u0e81\u0eb2\u0e94\u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99\u0ec1\u0e9a\u0e9a\u00a0<code>let<\/code>\u00a0\u0ec1\u0ea5\u0eb0\u00a0<code>const<\/code>. \u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99\u0e97\u0eb5\u0ec8\u0e9b\u0eb0\u0e81\u0eb2\u0e94\u0e94\u0ec9\u0ea7\u0e8d\u00a0<code>let<\/code>\u00a0\u0ec1\u0ea5\u0eb0\u00a0<code>const<\/code>\u00a0keyword \u0e88\u0eb0\u0e96\u0eb7\u0e81 store \u0ec1\u0e9a\u0e9a\u00a0<code>uninitialized<\/code><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"405\" src=\"https:\/\/laoitdev.com\/wp-content\/uploads\/2023\/04\/3.gif\" alt=\"\" class=\"wp-image-3684\"\/><\/figure>\n\n\n\n<p>\u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99\u0e97\u0eb5\u0ec8\u0e9b\u0eb0\u0e81\u0eb2\u0e94\u0e94\u0ec9\u0ea7\u0e8d\u00a0<code>var<\/code>\u00a0keyword \u0e88\u0eb0\u0e96\u0eb7\u0e81 store \u0e94\u0ec9\u0ea7\u0e8d\u0e84\u0ec8\u0eb2 default \u0e84\u0eb7\u00a0<code>undefined<\/code><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"405\" src=\"https:\/\/laoitdev.com\/wp-content\/uploads\/2023\/04\/4-1.gif\" alt=\"\" class=\"wp-image-3685\"\/><\/figure>\n\n\n\n<p>\u0ec0\u0ea1\u0eb7\u0ec8\u0ead\u0e82\u0eb1\u0ec9\u0e99\u0e95\u0ead\u0e99\u0e95\u0ec8\u0eb2\u0e87\u0ec6\u0e97\u0eb5\u0ec8\u0e81\u0ec8\u0eb2\u0ea7\u0ea1\u0eb2\u0eaa\u0eb3\u0ec0\u0ea5\u0eb1\u0e94\u0ec1\u0ea5\u0ec9\u0ea7 \u0ec0\u0eae\u0ebb\u0eb2\u0e88\u0eb6\u0ec8\u0e87\u0e88\u0eb0\u0eaa\u0eb2\u0ea1\u0eb2\u0e94 execute code \u0ec4\u0e94\u0ec9. \u0ea1\u0eb2\u0ec0\u0e9a\u0eb4\u0ec8\u0e87\u0e99\u0eb3\u0e81\u0eb1\u0e99\u0ea7\u0ec8\u0eb2\u0e96\u0ec9\u0eb2\u0ec0\u0eae\u0ebb\u0eb2\u0ec3\u0e8a\u0ec9\u00a0<code>console.log()<\/code>\u00a03 \u0ead\u0eb1\u0e99\u0ea2\u0eb9\u0ec8\u0ec0\u0e97\u0eb4\u0e87\u0eaa\u0eb8\u0e94\u0e82\u0ead\u0e87\u0ec4\u0e9f\u0ea5\u0ecc\u0e81\u0ec8\u0ead\u0e99\u0e97\u0eb5\u0ec8\u0ec0\u0eae\u0ebb\u0eb2\u0e88\u0eb0\u0e9b\u0eb0\u0e81\u0eb2\u0e94\u0e9f\u0eb1\u0e87\u0e8a\u0eb1\u0ec8\u0e99 \u0ec1\u0ea5\u0eb0 \u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99. \u0ec0\u0ea7\u0ebb\u0ec9\u0eb2\u0e87\u0ec8\u0eb2\u0e8d\u0e81\u0ecd\u0ec8\u0e84\u0eb7\u0ec0\u0ead\u0eb5\u0ec9\u0e99\u0ec3\u0e8a\u0ec9\u0e81\u0ec8\u0ead\u0e99\u0e97\u0eb5\u0ec8\u0e88\u0eb0\u0e9b\u0eb0\u0e81\u0eb2\u0e94<br>\u0ec0\u0e99\u0eb7\u0ec8\u0ead\u0e87\u0e88\u0eb2\u0e81 function \u0e96\u0eb7\u0e81 store \u0ec4\u0ea7\u0ec9\u0ec2\u0e94\u0e8d\u0e81\u0eb2\u0e99\u0ead\u0ec9\u0eb2\u0e87\u0ead\u0eb5\u0e87\u0ec0\u0e96\u0eb4\u0e87 code \u0e97\u0eb1\u0e87\u0edd\u0ebb\u0e94, \u0e94\u0eb1\u0ec8\u0e87\u0e99\u0eb1\u0ec9\u0e99\u0ec0\u0eae\u0ebb\u0eb2\u0e88\u0eb0\u0ec0\u0eab\u0eb1\u0e99\u0ea7\u0ec8\u0eb2\u0ec0\u0eae\u0ebb\u0eb2\u0eaa\u0eb2\u0ea1\u0eb2\u0e94\u0ec0\u0ead\u0eb5\u0ec9\u0e99\u0ec3\u0e8a\u0ec9 function \u0e81\u0ec8\u0ead\u0e99\u0e97\u0eb5\u0ec8\u0ec0\u0eae\u0ebb\u0eb2\u0e88\u0eb0\u0e9b\u0eb0\u0e81\u0eb2\u0e94 function.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"405\" src=\"https:\/\/laoitdev.com\/wp-content\/uploads\/2023\/04\/5.gif\" alt=\"\" class=\"wp-image-3686\"\/><\/figure>\n\n\n\n<p>\u0ec0\u0ea1\u0eb7\u0ec8\u0ead\u0ec0\u0eae\u0ebb\u0eb2\u0ead\u0ec9\u0eb2\u0e87\u0ec0\u0e96\u0eb4\u0e87\u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99\u0e97\u0eb5\u0ec8\u0e9b\u0eb0\u0e81\u0eb2\u0e94\u0e94\u0ec9\u0ea7\u0e8d\u00a0<code>var<\/code>\u00a0keyword \u0ec1\u0ea5\u0ec9\u0ea7\u0e97\u0eb3\u0e81\u0eb2\u0e99\u0ec0\u0ead\u0eb5\u0ec9\u0e99\u0ec3\u0e8a\u0ec9\u0e81\u0ec8\u0ead\u0e99\u0e97\u0eb5\u0ec8\u0e88\u0eb0\u0e9b\u0eb0\u0e81\u0eb2\u0e94\u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99, \u0ec1\u0e99\u0ec8\u0e99\u0ead\u0e99\u0ea7\u0ec8\u0eb2\u0ea1\u0eb1\u0e99\u0e88\u0eb0\u0ec2\u0e8d\u0e99\u0e84\u0ec8\u0eb2 default \u0ea1\u0eb2\u0ec3\u0eab\u0ec9\u0e99\u0eb1\u0ec9\u0e99\u0e81\u0ecd\u0ec8\u0e84\u0eb7:\u00a0<code>undefined<\/code>, \u0ec1\u0e95\u0ec8\u0e9a\u0eb2\u0e87\u0ec0\u0e97\u0eb7\u0ec8\u0ead\u0ea1\u0eb1\u0e99\u0e81\u0ecd\u0ec8\u0e88\u0eb0\u0ec0\u0e9b\u0eb1\u0e99\u00a0<code>unexpected<\/code>. \u0ec3\u0e99\u0eab\u0ebc\u0eb2\u0e8d\u0ec6\u0e81\u0ecd\u0ea5\u0eb0\u0e99\u0eb5\u0e96\u0ec9\u0eb2\u0e9e\u0ebb\u0e9a\u0ec0\u0eab\u0e94\u0e81\u0eb2\u0e99\u0ec1\u0e9a\u0e9a\u0e99\u0eb5\u0ec9\u0ec1\u0ea1\u0ec8\u0e99\u0ec3\u0eab\u0ec9\u0eaa\u0eb1\u0e99\u0e99\u0eb4\u0e96\u0eb2\u0e99\u0ec4\u0ea7\u0ec9\u0e81\u0ec8\u0ead\u0e99\u0ec0\u0ea5\u0eb5\u0e8d\u0ea7\u0ec8\u0eb2: \u0ec0\u0eae\u0ebb\u0eb2\u0ead\u0eb2\u0e94\u0e88\u0eb0\u0ea5\u0eb7\u0ea1\u0e9b\u0eb0\u0e81\u0eb2\u0e94\u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99\u0e81\u0ec8\u0ead\u0e99\u0e81\u0eb2\u0e99\u0ec0\u0ead\u0eb5\u0ec9\u0e99\u0ec3\u0e8a\u0ec9\u0eab\u0ebc\u0eb7\u0e9a\u0ecd\u0ec8?<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"405\" src=\"https:\/\/laoitdev.com\/wp-content\/uploads\/2023\/04\/6.gif\" alt=\"\" class=\"wp-image-3687\"\/><\/figure>\n\n\n\n<p>\u0ec0\u0e9e\u0eb7\u0ec8\u0ead\u0e9b\u0ec9\u0ead\u0e87\u0e81\u0eb1\u0e99\u0e9a\u0ecd\u0ec8\u0ec3\u0eab\u0ec9\u0eaa\u0eb2\u0ea1\u0eb2\u0e94\u0ead\u0ec9\u0eb2\u0e87\u0ead\u0eb5\u0e87\u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99\u0e97\u0eb5\u0ec8\u0ec0\u0e9b\u0eb1\u0e99\u00a0<code>undefined<\/code>\u00a0\u0ec0\u0e8a\u0eb1\u0ec8\u0e99\u0e94\u0ebd\u0ea7\u0e81\u0eb1\u0e9a\u0e81\u0eb2\u0e99\u0ec0\u0ead\u0eb5\u0ec9\u0e99\u0ec3\u0e8a\u0ec9\u00a0<code>var<\/code>\u00a0keyword \u0e97\u0eb5\u0ec8\u0ec0\u0eae\u0ebb\u0eb2\u0ec0\u0eab\u0eb1\u0e99\u0ec3\u0e99\u0e95\u0ebb\u0ea7\u0ea2\u0ec8\u0eb2\u0e87. \u0e88\u0eb0\u0ea1\u0eb5\u00a0<code>ReferenceError<\/code>\u00a0\u0e96\u0eb7\u0e81\u0ec2\u0e8d\u0e99\u0ead\u0ead\u0e81\u0ea1\u0eb2\u0ec0\u0ea1\u0eb7\u0ec8\u0ead\u0ec3\u0e94\u0e81\u0ecd\u0ec8\u0e95\u0eb2\u0ea1\u0e97\u0eb5\u0ec8\u0ec0\u0eae\u0ebb\u0eb2\u0e9e\u0eb0\u0e8d\u0eb2\u0e8d\u0eb2\u0ea1\u0ec0\u0ead\u0eb5\u0ec9\u0e99\u0ec3\u0e8a\u0ec9\u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99\u0e97\u0eb5\u0ec8\u0ec0\u0e9b\u0eb1\u0e99\u00a0<code>uninitialized<\/code>. zone \u0e97\u0eb5\u0ec8\u0ec0\u0eae\u0ebb\u0eb2\u0ec0\u0ead\u0eb5\u0ec9\u0e99\u0ec3\u0e8a\u0ec9\u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99\u0e81\u0ec8\u0ead\u0e99\u0e81\u0eb2\u0e99\u0e9b\u0eb0\u0e81\u0eb2\u0e94\u0e88\u0eb0\u0ec0\u0ead\u0eb5\u0ec9\u0e99\u0ea7\u0ec8\u0eb2: temporal dead zone &#8211; \u0ec0\u0eae\u0ebb\u0eb2\u0e9a\u0ecd\u0ec8\u0eaa\u0eb2\u0ea1\u0eb2\u0e94\u0ead\u0ec9\u0eb2\u0e87\u0ead\u0eb5\u0e87 \u0eab\u0ebc\u0eb7 \u0ec0\u0ead\u0eb5\u0ec9\u0e99\u0ec3\u0e8a\u0ec9\u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99\u0e81\u0ec8\u0ead\u0e99\u0e81\u0eb2\u0e99\u00a0<code>initialization<\/code>\u00a0\u0ec4\u0e94\u0ec9(\u0ea5\u0ea7\u0ea1\u0ec4\u0e9b\u0ec0\u0e96\u0eb4\u0e87 classes \u0e99\u0eb3)<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"405\" src=\"https:\/\/laoitdev.com\/wp-content\/uploads\/2023\/04\/7.gif\" alt=\"\" class=\"wp-image-3688\"\/><\/figure>\n\n\n\n<p>\u0ec0\u0ea1\u0eb7\u0ec8\u0ead JavaScript Engine \u0ec0\u0eae\u0eb1\u0e94\u0ea7\u0ebd\u0e81\u0eae\u0ead\u0e94\u0ec1\u0e96\u0ea7\u0e97\u0eb5\u0ec8\u0ec0\u0eae\u0ebb\u0eb2\u0e9b\u0eb0\u0e81\u0eb2\u0e94\u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99\u0ec4\u0ea7\u0ec9, \u0ea1\u0eb1\u0e99\u0e88\u0eb0\u0e97\u0eb3\u0e81\u0eb2\u0e99\u0e82\u0ebd\u0e99\u0e97\u0eb1\u0e9a value \u0e97\u0eb5\u0ec8\u0ea2\u0eb9\u0ec8\u0ec3\u0e99 memory \u0e97\u0eb5\u0ec8\u0ec0\u0e9b\u0eb1\u0e99 value \u0e97\u0eb5\u0ec8\u0ec0\u0eae\u0ebb\u0eb2\u0e82\u0ebd\u0e99\u0ec4\u0ea7\u0ec9\u0ec3\u0e99 code.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"405\" src=\"https:\/\/laoitdev.com\/wp-content\/uploads\/2023\/04\/8.gif\" alt=\"\" class=\"wp-image-3689\"\/><\/figure>\n\n\n\n<p>\u0eaa\u0eb0\u0eab\u0ebc\u0eb8\u0e9a:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><code>function<\/code>&nbsp;\u0ec1\u0ea5\u0eb0&nbsp;<code>variables<\/code>&nbsp;\u0e88\u0eb0\u0e96\u0eb7\u0e81 store \u0ec4\u0ea7\u0ec9\u0ec3\u0e99 memory \u0eaa\u0eb3\u0ea5\u0eb1\u0e9a\u0e81\u0eb2\u0e99 execution \u0e81\u0ec8\u0ead\u0e99\u0e97\u0eb5\u0ec8\u0e88\u0eb0\u0e97\u0eb3\u0e81\u0eb2\u0e99 execute code \u0e82\u0ead\u0e87\u0ec0\u0eae\u0ebb\u0eb2, \u0e82\u0eb0\u0e9a\u0ea7\u0e99\u0e81\u0eb2\u0e99\u0e97\u0eb5\u0ec8\u0ea7\u0ec8\u0eb2\u0ea1\u0eb2\u0ec0\u0ead\u0eb5\u0ec9\u0e99\u0ea7\u0ec8\u0eb2 hoisting.<\/li><li><code>function<\/code>&nbsp;\u0e88\u0eb0\u0e96\u0eb7\u0e81 store \u0ec2\u0e94\u0e8d\u0ead\u0ec9\u0eb2\u0e87\u0ead\u0eb5\u0e87\u0ec0\u0e96\u0eb4\u0e87&nbsp;<code>function<\/code>&nbsp;\u0e97\u0eb1\u0e87\u0edd\u0ebb\u0e94, \u0eaa\u0ec8\u0ea7\u0e99\u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99\u0e97\u0eb5\u0ec8\u0ec3\u0e8a\u0ec9&nbsp;<code>var<\/code>&nbsp;keyword \u0e88\u0eb0\u0e96\u0eb7\u0e81 store \u0e94\u0ec9\u0ea7\u0e8d\u0e84\u0ec8\u0eb2 default \u0e84\u0eb7:\u200b&nbsp;<code>undefined<\/code>&nbsp;\u0ec1\u0ea5\u0eb0 \u0e95\u0ebb\u0ea7\u0e9b\u0ec8\u0ebd\u0e99\u0e97\u0eb5\u0ec8\u0ec3\u0e8a\u0ec9&nbsp;<code>let<\/code>&nbsp;\u0ec1\u0ea5\u0eb0&nbsp;<code>const<\/code>&nbsp;keyword \u0ec1\u0ea1\u0ec8\u0e99\u0e88\u0eb0\u0e96\u0eb7\u0e81 store \u0e94\u0ec9\u0ea7\u0e8d&nbsp;<code>uninitialized<\/code><\/li><\/ul>\n\n\n\n<p>\u0ead\u0ec9\u0eb2\u0e87\u0ead\u0eb5\u0e87:\u00a0<a href=\"https:\/\/dev.to\/lydiahallie\/javascript-visualized-hoisting-478h\" target=\"_blank\" rel=\"noreferrer noopener\">\ud83d\udd25\ud83d\udd7a\ud83c\udffc JavaScript Visualized: Hoisting<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/medium.com\/tag\/web\" target=\"_blank\" rel=\"noreferrer noopener\">Web<\/a> <a href=\"https:\/\/medium.com\/tag\/web-development\" target=\"_blank\" rel=\"noreferrer noopener\">Web Development<\/a> <a href=\"https:\/\/medium.com\/tag\/javascript\" target=\"_blank\" rel=\"noreferrer noopener\">JavaScript<\/a> <a href=\"https:\/\/medium.com\/tag\/js\" target=\"_blank\" rel=\"noreferrer noopener\">Js<\/a> <a href=\"https:\/\/medium.com\/tag\/javascript-development\" target=\"_blank\" rel=\"noreferrer noopener\">Javascript Development<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Hoisting \u2014 JS Developer \u0eab\u0ebc\u0eb2\u0e8d\u0e84\u0ebb\u0e99\u0e81\u0ecd\u0ec8\u0e84\u0ebb\u0e87\u0e84\u0eb8\u0ec9\u0e99\u0eab\u0eb9\u0e81\u0eb1\u0e9a\u0e84\u0eb3\u0e99\u0eb5\u0ec9\u0ea2\u0eb9\u0ec8\u0e9a\u0ecd\u0ec8\u0edc\u0ec9\u0ead\u0e8d\u0ec0\u0e99\u0eb7\u0ec8\u0ead\u0e87\u0e88\u0eb2\u0e81\u0eab\u0ebc\u0eb2\u0e8d\u0ec6\u0ec0\u0e97\u0eb7\u0ec8\u0ead\u0e97\u0eb5\u0ec8\u0ec4\u0e9b\u0e84\u0ebb\u0ec9\u0e99\u0ea7\u0eb4\u0e97\u0eb5\u0ec1\u0e81\u0ec9 error \u0ea2\u0eb9\u0ec8 google \u0ea1\u0eb1\u0e81\u0e88\u0eb0\u0ec0\u0eab\u0eb1\u0e99\u0e84\u0ebb\u0e99\u0ea1\u0eb2\u0e9a\u0ead\u0e81\u0ea7\u0ec8\u0eb2 error \u0e99\u0eb5\u0ec9\u0ec0\u0e81\u0eb5\u0e94\u0e88\u0eb2\u0e81 hoisting, \u0ec1\u0e95\u0ec8 hoisting \u0ea1\u0eb1\u0e99\u0ec1\u0ea1\u0ec8\u0e99\u0ec1\u0e9a\u0ec9\u0eab\u0e8d\u0eb1\u0e87\u0ea5\u0ec8\u0eb0? \u0e94\u0ebd\u0ea7\u0e9a\u0ebb\u0e94\u0e84\u0ea7\u0eb2\u0ea1\u0e99\u0eb5\u0ec9\u0e88\u0eb0\u0ea1\u0eb2\u0ead\u0eb0\u0e97\u0eb4\u0e9a\u0eb2\u0e8d\u0ea7\u0ec8\u0eb2\u0ec1\u0e9a\u0ec9\u0ead\u0eb5\u0ec8\u0eab\u0e8d\u0eb1\u0e87\u0e84\u0eb7 hoisting. \u0e95\u0ead\u0e99\u0e97\u0eb5\u0ec8\u0ec0\u0ea5\u0eb5\u0ec8\u0ea1\u0e82\u0ebd\u0e99 JavaScript \u0e8a\u0ec8\u0ea7\u0e87\u0ec1\u0ea5\u0e81\u0ec6\u0e81\u0ecd\u0ec8\u0ec0\u0e84\u0eb5\u0e8d\u0e9e\u0ecd\u0ec9\u0ec0\u0eab\u0e94\u0e81\u0eb2\u0e99\u0e97\u0eb5\u0ec8\u0ea7\u0ec8\u0eb2 &#8230; <a class=\"cz_readmore\" href=\"https:\/\/laoitdev.com\/lao\/2023\/3681\/\"><i class=\"fa fa-angle-right\"><\/i><span>\u0ead\u0ec8\u0eb2\u0e99\u0ec0\u0e9e\u0eb5\u0ec8\u0ea1\u0ec0\u0e95\u0eb5\u0ea1<\/span><\/a><\/p>","protected":false},"author":6,"featured_media":3682,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-3681","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>JavaScript EP2: Hoisting\u00a0 - Lao IT Dev<\/title>\n<meta name=\"description\" content=\"Hoisting \u2014 JS Developer \u0eab\u0ebc\u0eb2\u0e8d\u0e84\u0ebb\u0e99\u0e81\u0ecd\u0ec8\u0e84\u0ebb\u0e87\u0e84\u0eb8\u0ec9\u0e99\u0eab\u0eb9\u0e81\u0eb1\u0e9a\u0e84\u0eb3\u0e99\u0eb5\u0ec9\u0ea2\u0eb9\u0ec8\u0e9a\u0ecd\u0ec8\u0edc\u0ec9\u0ead\u0e8d\u0ec0\u0e99\u0eb7\u0ec8\u0ead\u0e87\u0e88\u0eb2\u0e81\u0eab\u0ebc\u0eb2\u0e8d\u0ec6\u0ec0\u0e97\u0eb7\u0ec8\u0ead\u0e97\u0eb5\u0ec8\u0ec4\u0e9b\u0e84\u0ebb\u0ec9\u0e99\u0ea7\u0eb4\u0e97\u0eb5\u0ec1\u0e81\u0ec9 error \u0ea2\u0eb9\u0ec8 google \u0ea1\u0eb1\u0e81\u0e88\u0eb0\u0ec0\u0eab\u0eb1\u0e99\u0e84\u0ebb\u0e99\u0ea1\u0eb2\u0e9a\u0ead\u0e81\u0ea7\u0ec8\u0eb2 error \u0e99\u0eb5\u0ec9\u0ec0\u0e81\u0eb5\u0e94\u0e88\u0eb2\u0e81 Lao IT Dev JavaScript EP2: Hoisting\u00a0 Domestic and international ICT services, consultants, Mobile app, Web development, application development, Blockchain, AI and Cryptocurrency\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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EP2: Hoisting\u00a0 Domestic and international ICT services, consultants, Mobile app, Web development, application development, Blockchain, AI and Cryptocurrency\" \/>\n<meta property=\"og:url\" content=\"https:\/\/laoitdev.com\/lao\/2023\/3681\/\" \/>\n<meta property=\"og:site_name\" content=\"Lao IT Dev\" \/>\n<meta property=\"article:published_time\" content=\"2023-04-20T14:38:42+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-02-07T13:56:51+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/laoitdev.com\/wp-content\/uploads\/2023\/04\/1.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"tokky\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0e82\u0ebd\u0e99\u0ec2\u0e94\u0e8d\" \/>\n\t<meta name=\"twitter:data1\" 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