{"id":816,"date":"2023-01-20T16:04:49","date_gmt":"2023-01-20T07:04:49","guid":{"rendered":"https:\/\/blog.dozzing.kr\/?p=816"},"modified":"2025-10-24T11:31:40","modified_gmt":"2025-10-24T02:31:40","slug":"javascript-%ec%9e%90%eb%b0%94%ec%8a%a4%ed%81%ac%eb%a6%bd%ed%8a%b8-%eb%b3%80%ec%88%98-%ec%84%a0%ec%96%b8-%eb%b0%a9%ec%8b%9d","status":"publish","type":"post","link":"https:\/\/blog.dozzing.kr\/?p=816","title":{"rendered":"[JavaScript] \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8 \ubcc0\uc218 \uc120\uc5b8 \ubc29\uc2dd"},"content":{"rendered":"<h2>\ud83d\udcab var<\/h2>\n<p><code>var<\/code>\ub294 \uae30\uc874\uc758 \ubcc0\uc218 \uc120\uc5b8 \ubc29\uc2dd\uc73c\ub85c, \ud604\uc7ac\ub294 \uac00\uae09\uc801 \uc0ac\uc6a9\uc744 \uc9c0\uc591\ud558\uace0 \uc788\ub2e4.<\/p>\n<h3>\ud2b9\uc9d5:<\/h3>\n<ul>\n<li><strong>\ud568\uc218 \uc2a4\ucf54\ud504(Function Scope):<\/strong>\ubcc0\uc218\uac00 \uc120\uc5b8\ub41c \ud568\uc218 \ub0b4\ubd80\uc5d0\uc11c\ub9cc \uc811\uadfc \uac00\ub2a5\ud558\uba70, \ube14\ub85d(<code>{}<\/code>) \ub0b4\uc5d0\uc11c \uc120\uc5b8\ud558\ub354\ub77c\ub3c4 \ube14\ub85d\uc744 \ubb34\uc2dc\ud558\uace0 \uc811\uadfc\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<li><strong>\uc7ac\uc120\uc5b8 \uac00\ub2a5:<\/strong>\ub3d9\uc77c\ud55c \uc774\ub984\uc758 \ubcc0\uc218\ub97c \uc911\ubcf5 \uc120\uc5b8\ud574\ub3c4 \uc624\ub958\uac00 \ubc1c\uc0dd\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/li>\n<li><strong>\ud638\uc774\uc2a4\ud305(Hoisting):<\/strong>\uc120\uc5b8\uc774 \ucf54\ub4dc\uc758 \ucd5c\uc0c1\ub2e8\uc73c\ub85c \ub04c\uc5b4\uc62c\ub824\uc9c0\uc9c0\ub9cc, \ucd08\uae30\ud654\ub294 \uc120\uc5b8 \uc774\ud6c4\uc5d0 \uc774\ub8e8\uc5b4\uc9d1\ub2c8\ub2e4.<\/li>\n<li><strong>\ucd08\uae30\uac12 \ud560\ub2f9\uc774 \uc5c6\uc5b4\ub3c4 <code>undefined<\/code>\ub85c \uc790\ub3d9 \ucd08\uae30\ud654.<\/strong><\/li>\n<\/ul>\n<pre><code class=\"language-javaScript line-numbers\">function example() {\n    if (true) {\n        var x = 10;\n    }\n    console.log(x);  \/\/ 10 (\ube14\ub85d \uc2a4\ucf54\ud504 \ubb34\uc2dc)\n}\n\nvar a = 5;\nvar a = 10;  \/\/ \uc7ac\uc120\uc5b8 \uac00\ub2a5\nconsole.log(a);  \/\/ 10\n<\/code><\/pre>\n<h2>\ud83d\udcab let<\/h2>\n<p><code>let<\/code>\uc740 \ube14\ub85d \uc2a4\ucf54\ud504\ub97c \uac00\uc9c0\uba70, \uc7ac\uc120\uc5b8\uc774 \ubd88\uac00\ub2a5\ud558\ub2e4.<\/p>\n<h3>\ud2b9\uc9d5:<\/h3>\n<ul>\n<li><strong>\ube14\ub85d \uc2a4\ucf54\ud504(Block Scope):<\/strong>\ubcc0\uc218\uac00 \uc120\uc5b8\ub41c \ube14\ub85d(<code>{}<\/code>) \ub0b4\uc5d0\uc11c\ub9cc \uc811\uadfc \uac00\ub2a5.<\/li>\n<li><strong>\uc7ac\uc120\uc5b8 \ubd88\uac00:<\/strong>\uac19\uc740 \ubcc0\uc218 \uc774\ub984\uc73c\ub85c \uc911\ubcf5 \uc120\uc5b8\ud558\uba74 \uc624\ub958 \ubc1c\uc0dd.<\/li>\n<li><strong>\ud638\uc774\uc2a4\ud305 \ubc1c\uc0dd\ud558\uc9c0\ub9cc \ucd08\uae30\ud654 \uc804\uc5d0\ub294 \uc0ac\uc6a9 \ubd88\uac00(\uc77c\uc2dc\uc801 \uc0ac\uac01\uc9c0\ub300, TDZ).<\/strong><\/li>\n<li><strong>\ucd08\uae30\uac12 \uc5c6\uc774 \uc120\uc5b8 \uac00\ub2a5\ud558\uba70, \uac12 \ubcc0\uacbd \uac00\ub2a5.<\/strong><\/li>\n<\/ul>\n<pre><code class=\"language-javaScript line-numbers\">function example() {\n    if (true) {\n        let x = 10;\n        console.log(x);  \/\/ 10\n    }\n    \/\/ console.log(x);  \/\/ \uc624\ub958 \ubc1c\uc0dd (x is not defined)\n}\n\nlet b = 5;\n\/\/ let b = 10;  \/\/ \uc624\ub958 \ubc1c\uc0dd (\uc7ac\uc120\uc5b8 \ubd88\uac00)\nb = 20;  \/\/ \uac12 \ubcc0\uacbd \uac00\ub2a5\nconsole.log(b);  \/\/ 20\n<\/code><\/pre>\n<h2>\ud83d\udcab const<\/h2>\n<p><code>const<\/code>\ub294 \uc0c1\uc218\ub97c \uc120\uc5b8\ud560 \ub54c \uc0ac\uc6a9\ub418\uba70, \ud55c \ubc88 \uac12\uc774 \ud560\ub2f9\ub418\uba74 \ubcc0\uacbd\ud560 \uc218 \uc5c6\ub2e4.<\/p>\n<h3>\ud2b9\uc9d5:<\/h3>\n<ul>\n<li><strong>\ube14\ub85d \uc2a4\ucf54\ud504(Block Scope):<\/strong><code>let<\/code>\uacfc \ub9c8\ucc2c\uac00\uc9c0\ub85c \ube14\ub85d \ub0b4\ubd80\uc5d0\uc11c\ub9cc \uc811\uadfc \uac00\ub2a5.<\/li>\n<li><strong>\uc7ac\uc120\uc5b8 \ubc0f \uc7ac\ud560\ub2f9 \ubd88\uac00:<\/strong>\ub3d9\uc77c \uc774\ub984\uc73c\ub85c \uc120\uc5b8\ud558\uac70\ub098 \uac12\uc744 \ub2e4\uc2dc \ud560\ub2f9\ud558\uba74 \uc624\ub958 \ubc1c\uc0dd.<\/li>\n<li><strong>\ud638\uc774\uc2a4\ud305 \ubc1c\uc0dd\ud558\uc9c0\ub9cc \ucd08\uae30\ud654 \uc804\uc5d0\ub294 \uc0ac\uc6a9 \ubd88\uac00(TDZ \uc874\uc7ac).<\/strong><\/li>\n<li><strong>\uc120\uc5b8\uacfc \ub3d9\uc2dc\uc5d0 \ucd08\uae30\ud654 \ud544\uc218.<\/strong><\/li>\n<li><strong>\uac1d\uccb4\uc758 \uacbd\uc6b0 \uc18d\uc131 \ubcc0\uacbd\uc740 \uac00\ub2a5\ud558\ub098 \uac1d\uccb4 \uc790\uccb4 \uc7ac\ud560\ub2f9 \ubd88\uac00.<\/strong><\/li>\n<\/ul>\n<pre><code class=\"language-javaScript line-numbers\">const c = 10;\n\/\/ c = 20;  \/\/ \uc624\ub958 \ubc1c\uc0dd (\uc7ac\ud560\ub2f9 \ubd88\uac00)\n\/\/ const c = 30;  \/\/ \uc624\ub958 \ubc1c\uc0dd (\uc7ac\uc120\uc5b8 \ubd88\uac00)\n\n\/\/ \uac1d\uccb4\uc758 \uacbd\uc6b0 \uc18d\uc131 \uc218\uc815 \uac00\ub2a5\nconst obj = { name: 'Alice' };\nobj.name = 'Bob';  \/\/ \uac00\ub2a5\n\/\/ obj = { name: 'Charlie' };  \/\/ \uc624\ub958 \ubc1c\uc0dd (\uac1d\uccb4 \uc7ac\ud560\ub2f9 \ubd88\uac00)\nconsole.log(obj.name);  \/\/ Bob\n<\/code><\/pre>\n<h2>\ud83d\udcab \ube44\uad50<\/h2>\n<table>\n<thead>\n<tr>\n<th>\uad6c\ubd84<\/th>\n<th>var<\/th>\n<th>let<\/th>\n<th>const<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\uc2a4\ucf54\ud504<\/td>\n<td>\ud568\uc218 \uc2a4\ucf54\ud504<\/td>\n<td>\ube14\ub85d \uc2a4\ucf54\ud504<\/td>\n<td>\ube14\ub85d \uc2a4\ucf54\ud504<\/td>\n<\/tr>\n<tr>\n<td>\uc7ac\uc120\uc5b8<\/td>\n<td>\uac00\ub2a5<\/td>\n<td>\ubd88\uac00\ub2a5<\/td>\n<td>\ubd88\uac00\ub2a5<\/td>\n<\/tr>\n<tr>\n<td>\uc7ac\ud560\ub2f9<\/td>\n<td>\uac00\ub2a5<\/td>\n<td>\uac00\ub2a5<\/td>\n<td>\ubd88\uac00\ub2a5<\/td>\n<\/tr>\n<tr>\n<td>\ud638\uc774\uc2a4\ud305<\/td>\n<td>\ub428(\ucd08\uae30\uac12 <code>undefined<\/code>)<\/td>\n<td>\ub428(\ucd08\uae30\ud654 \uc804 \uc811\uadfc \ubd88\uac00)<\/td>\n<td>\ub428(\ucd08\uae30\ud654 \uc804 \uc811\uadfc \ubd88\uac00)<\/td>\n<\/tr>\n<tr>\n<td>\ucd08\uae30\ud654<\/td>\n<td>\uc120\ud0dd\uc801<\/td>\n<td>\uc120\ud0dd\uc801<\/td>\n<td>\ud544\uc218<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>\ud83d\udcab var var\ub294 \uae30\uc874\uc758 \ubcc0\uc218 \uc120\uc5b8 \ubc29\uc2dd\uc73c\ub85c, \ud604\uc7ac\ub294 \uac00\uae09\uc801 \uc0ac\uc6a9\uc744 \uc9c0\uc591\ud558\uace0 \uc788\ub2e4. \ud2b9\uc9d5: \ud568\uc218 \uc2a4\ucf54\ud504(Function Scope):\ubcc0\uc218\uac00 \uc120\uc5b8\ub41c \ud568\uc218 \ub0b4\ubd80\uc5d0\uc11c\ub9cc \uc811\uadfc \uac00\ub2a5\ud558\uba70, \ube14\ub85d({}) \ub0b4\uc5d0\uc11c \uc120\uc5b8\ud558\ub354\ub77c\ub3c4 \ube14\ub85d\uc744 \ubb34\uc2dc\ud558\uace0 \uc811\uadfc\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc7ac\uc120\uc5b8 \uac00\ub2a5:\ub3d9\uc77c\ud55c \uc774\ub984\uc758 \ubcc0\uc218\ub97c \uc911\ubcf5 \uc120\uc5b8\ud574\ub3c4 \uc624\ub958\uac00 \ubc1c\uc0dd\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \ud638\uc774\uc2a4\ud305(Hoisting):\uc120\uc5b8\uc774 \ucf54\ub4dc\uc758 \ucd5c\uc0c1\ub2e8\uc73c\ub85c \ub04c\uc5b4\uc62c\ub824\uc9c0\uc9c0\ub9cc, \ucd08\uae30\ud654\ub294 \uc120\uc5b8 \uc774\ud6c4\uc5d0 \uc774\ub8e8\uc5b4\uc9d1\ub2c8\ub2e4. \ucd08\uae30\uac12 \ud560\ub2f9\uc774 \uc5c6\uc5b4\ub3c4 undefined\ub85c \uc790\ub3d9 \ucd08\uae30\ud654. function example() { [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[50,30,33],"tags":[32,34],"class_list":["post-816","post","type-post","status-publish","format-standard","hentry","category-frontend","category-javascript","category-web","tag-javascript","tag-web"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[JavaScript] \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8 \ubcc0\uc218 \uc120\uc5b8 \ubc29\uc2dd - Dozzing World<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.dozzing.kr\/?p=816\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[JavaScript] \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8 \ubcc0\uc218 \uc120\uc5b8 \ubc29\uc2dd - Dozzing World\" \/>\n<meta property=\"og:description\" content=\"\ud83d\udcab var var\ub294 \uae30\uc874\uc758 \ubcc0\uc218 \uc120\uc5b8 \ubc29\uc2dd\uc73c\ub85c, \ud604\uc7ac\ub294 \uac00\uae09\uc801 \uc0ac\uc6a9\uc744 \uc9c0\uc591\ud558\uace0 \uc788\ub2e4. \ud2b9\uc9d5: \ud568\uc218 \uc2a4\ucf54\ud504(Function Scope):\ubcc0\uc218\uac00 \uc120\uc5b8\ub41c \ud568\uc218 \ub0b4\ubd80\uc5d0\uc11c\ub9cc \uc811\uadfc \uac00\ub2a5\ud558\uba70, \ube14\ub85d({}) \ub0b4\uc5d0\uc11c \uc120\uc5b8\ud558\ub354\ub77c\ub3c4 \ube14\ub85d\uc744 \ubb34\uc2dc\ud558\uace0 \uc811\uadfc\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc7ac\uc120\uc5b8 \uac00\ub2a5:\ub3d9\uc77c\ud55c \uc774\ub984\uc758 \ubcc0\uc218\ub97c \uc911\ubcf5 \uc120\uc5b8\ud574\ub3c4 \uc624\ub958\uac00 \ubc1c\uc0dd\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \ud638\uc774\uc2a4\ud305(Hoisting):\uc120\uc5b8\uc774 \ucf54\ub4dc\uc758 \ucd5c\uc0c1\ub2e8\uc73c\ub85c \ub04c\uc5b4\uc62c\ub824\uc9c0\uc9c0\ub9cc, \ucd08\uae30\ud654\ub294 \uc120\uc5b8 \uc774\ud6c4\uc5d0 \uc774\ub8e8\uc5b4\uc9d1\ub2c8\ub2e4. \ucd08\uae30\uac12 \ud560\ub2f9\uc774 \uc5c6\uc5b4\ub3c4 undefined\ub85c \uc790\ub3d9 \ucd08\uae30\ud654. function example() { [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.dozzing.kr\/?p=816\" \/>\n<meta property=\"og:site_name\" content=\"Dozzing World\" \/>\n<meta property=\"article:published_time\" content=\"2023-01-20T07:04:49+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-24T02:31:40+00:00\" \/>\n<meta name=\"author\" content=\"Dozzing\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\uae00\uc4f4\uc774\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dozzing\" \/>\n\t<meta name=\"twitter:label2\" content=\"\uc608\uc0c1 \ub418\ub294 \ud310\ub3c5 \uc2dc\uac04\" \/>\n\t<meta name=\"twitter:data2\" content=\"3\ubd84\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blog.dozzing.kr\/?p=816\",\"url\":\"https:\/\/blog.dozzing.kr\/?p=816\",\"name\":\"[JavaScript] \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8 \ubcc0\uc218 \uc120\uc5b8 \ubc29\uc2dd - Dozzing 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\/ Yoast SEO plugin. -->","yoast_head_json":{"title":"[JavaScript] \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8 \ubcc0\uc218 \uc120\uc5b8 \ubc29\uc2dd - Dozzing World","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/blog.dozzing.kr\/?p=816","og_locale":"ko_KR","og_type":"article","og_title":"[JavaScript] \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8 \ubcc0\uc218 \uc120\uc5b8 \ubc29\uc2dd - Dozzing World","og_description":"\ud83d\udcab var var\ub294 \uae30\uc874\uc758 \ubcc0\uc218 \uc120\uc5b8 \ubc29\uc2dd\uc73c\ub85c, \ud604\uc7ac\ub294 \uac00\uae09\uc801 \uc0ac\uc6a9\uc744 \uc9c0\uc591\ud558\uace0 \uc788\ub2e4. \ud2b9\uc9d5: \ud568\uc218 \uc2a4\ucf54\ud504(Function Scope):\ubcc0\uc218\uac00 \uc120\uc5b8\ub41c \ud568\uc218 \ub0b4\ubd80\uc5d0\uc11c\ub9cc \uc811\uadfc \uac00\ub2a5\ud558\uba70, \ube14\ub85d({}) \ub0b4\uc5d0\uc11c \uc120\uc5b8\ud558\ub354\ub77c\ub3c4 \ube14\ub85d\uc744 \ubb34\uc2dc\ud558\uace0 \uc811\uadfc\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc7ac\uc120\uc5b8 \uac00\ub2a5:\ub3d9\uc77c\ud55c \uc774\ub984\uc758 \ubcc0\uc218\ub97c \uc911\ubcf5 \uc120\uc5b8\ud574\ub3c4 \uc624\ub958\uac00 \ubc1c\uc0dd\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \ud638\uc774\uc2a4\ud305(Hoisting):\uc120\uc5b8\uc774 \ucf54\ub4dc\uc758 \ucd5c\uc0c1\ub2e8\uc73c\ub85c \ub04c\uc5b4\uc62c\ub824\uc9c0\uc9c0\ub9cc, \ucd08\uae30\ud654\ub294 \uc120\uc5b8 \uc774\ud6c4\uc5d0 \uc774\ub8e8\uc5b4\uc9d1\ub2c8\ub2e4. \ucd08\uae30\uac12 \ud560\ub2f9\uc774 \uc5c6\uc5b4\ub3c4 undefined\ub85c \uc790\ub3d9 \ucd08\uae30\ud654. function example() { [&hellip;]","og_url":"https:\/\/blog.dozzing.kr\/?p=816","og_site_name":"Dozzing World","article_published_time":"2023-01-20T07:04:49+00:00","article_modified_time":"2025-10-24T02:31:40+00:00","author":"Dozzing","twitter_card":"summary_large_image","twitter_misc":{"\uae00\uc4f4\uc774":"Dozzing","\uc608\uc0c1 \ub418\ub294 \ud310\ub3c5 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