{"id":16486,"date":"2024-12-04T21:50:15","date_gmt":"2024-12-04T18:20:15","guid":{"rendered":"https:\/\/www.itpiran.net\/blog\/?p=16486"},"modified":"2024-12-04T21:50:15","modified_gmt":"2024-12-04T18:20:15","slug":"es5-vs-es6-in-javascript-14-big-changes","status":"publish","type":"post","link":"https:\/\/www.itpiran.net\/blog\/ja\/tutorials\/es5-vs-es6-in-javascript-14-big-changes\/","title":{"rendered":"JavaScript\u306b\u304a\u3051\u308bES5\u3068ES6\u306e14\u306e\u5927\u304d\u306a\u5909\u66f4\u70b9"},"content":{"rendered":"<h2 id=\"%d9%85%d9%82%d8%af%d9%85%d9%87\">\u5c0e\u5165<\/h2>\n<p>ES5\u3068ES6\u306f\u3001JavaScript\u3092\u542b\u3080\u8907\u6570\u306e\u8a00\u8a9e\u306e\u57fa\u76e4\u3068\u306a\u308b\u30b9\u30af\u30ea\u30d7\u30c8\u8a00\u8a9e\u4ed5\u69d8\u3067\u3042\u308bECMAScript\u6a19\u6e96\u306e\u7570\u306a\u308b\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u6307\u3057\u307e\u3059\u3002ES5\u304b\u3089ES6\uff08ECMAScript 2015\u3068\u3082\u547c\u3070\u308c\u307e\u3059\uff09\u3078\u306e\u9032\u5316\u306b\u3088\u308a\u3001\u591a\u304f\u306e\u5909\u66f4\u3068\u6539\u5584\u304c\u3082\u305f\u3089\u3055\u308c\u307e\u3057\u305f\u3002\u4ee5\u4e0b\u306f\u3001\u4e21\u8005\u306e\u6bd4\u8f03\u3067\u3059\u3002<\/p>\n<h2 id=\"let-1-%d9%88-const-%d8%aa%d8%b9%d8%b1%db%8c%d9%81-%d9%85%d8%aa%d8%ba%db%8c%d8%b1%d9%87%d8%a7\">let .1 \u3068 const (\u5909\u6570\u306e\u5ba3\u8a00)<\/h2>\n<p><strong>ES5:<\/strong> \u5909\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u4e3b\u306a\u65b9\u6cd5\u306f\u3001 <code inline=\"\">var<\/code> \u305d\u3046\u3060\u3063\u305f\u3002.<br \/>\n<strong>ES6:<\/strong> \u5c0e\u5165 <code inline=\"\">\u3055\u305b\u3066<\/code> \u30d6\u30ed\u30c3\u30af\u30d9\u30fc\u30b9\u306e\u5909\u6570\u3092\u5b9a\u7fa9\u3057\u3001 <code inline=\"\">\u5b9a\u6570<\/code> \u30d6\u30ed\u30c3\u30af\u30d9\u30fc\u30b9\u306e\u5b9a\u6570\u5909\u6570\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002.<\/p>\n<h2 id=\"2-%d8%a7%d9%84%da%af%d9%88%d9%87%d8%a7%db%8c-%d8%b1%d8%b4%d8%aa%d9%87%d8%a7%db%8c-template-literals\">2. \u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30ea\u30c6\u30e9\u30eb<\/h2>\n<p><strong>ES5:<\/strong> \u6587\u5b57\u5217\u3092\u4f7f\u7528\u3059\u308b <code inline=\"\">+<\/code> \u305d\u308c\u3089\u306f\u3064\u306a\u304c\u3063\u3066\u3044\u305f\u3002.<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>var name = \"John\";\r\nvar greeting = \"Hello, \" + name + \"!\";<\/code><\/pre>\n<\/div>\n<p><strong>ES6:<\/strong> \u6587\u5b57\u5217\u30d1\u30bf\u30fc\u30f3\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002.<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code> let name = \"John\";\r\nlet greeting = `Hello, ${name}!`;<\/code><\/pre>\n<\/div>\n<h2 id=\"arrow-functions-3\">\u77e2\u5370\u95a2\u6570 .3<\/h2>\n<p><strong>ES5<\/strong>:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code> function(x) {\r\nreturn x * x;\r\n}<\/code><\/pre>\n<\/div>\n<p><strong>ES6:<\/strong> \u77e2\u5370\u95a2\u6570\u304c\u5c0e\u5165\u3055\u308c\u3001\u95a2\u6570\u3092\u8a18\u8ff0\u3059\u308b\u305f\u3081\u306e\u8868\u8a18\u6cd5\u304c\u77ed\u7e2e\u3055\u308c\u307e\u3057\u305f\u3002.<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code> x =&gt; x * x;\r\n<\/code><\/pre>\n<\/div>\n<h2 id=\"4-%da%a9%d9%84%d8%a7%d8%b3%d9%87%d8%a7-classes\">4. \u30af\u30e9\u30b9<\/h2>\n<p><strong>ES5:<\/strong> \u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u7d99\u627f\u306f\u30af\u30e9\u30b9\u306e\u52d5\u4f5c\u3092\u30b7\u30df\u30e5\u30ec\u30fc\u30c8\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3057\u305f\u3002.<br \/>\n<strong>ES6:<\/strong> \u30ad\u30fc\u30ef\u30fc\u30c9 <code inline=\"\">\u30af\u30e9\u30b9<\/code> \u3053\u308c\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u305f\u3081\u306b\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002.<\/p>\n<h2 id=\"5-%d8%a8%d9%87%d8%a8%d9%88%d8%af-%d8%af%d8%b1-%d9%86%da%af%d8%a7%d8%b1%d8%b4-%d8%a7%d8%b4%db%8c%d8%a7%d8%a1-enhanced-object-literals\">5. \u62e1\u5f35\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30ea\u30c6\u30e9\u30eb<\/h2>\n<p><strong>ES5:<\/strong> \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30ad\u30fc\u3068\u5024\u306e\u30da\u30a2\u306b\u3088\u3063\u3066\u5b9a\u7fa9\u3055\u308c\u307e\u3057\u305f\u3002.<br \/>\n<strong>ES6:<\/strong> \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306e\u3088\u308a\u77ed\u3044\u8868\u8a18\u6cd5\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002.<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code> let name = \"John\";\r\nlet obj = {name}; \/\/ Equivalent to {name: name}<\/code><\/pre>\n<\/div>\n<h2 id=\"6-%d8%aa%d8%ac%d8%b2%db%8c%d9%87%d8%b3%d8%a7%d8%b2%db%8c-destructuring\">6. \u69cb\u9020\u7834\u58ca<\/h2>\n<p><strong>ES5:<\/strong> \u76f4\u63a5\u7684\u306a\u65b9\u6cd5\u306f\u3042\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002.<br \/>\n<strong>ES6:<\/strong> \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u307e\u305f\u306f\u914d\u5217\u304b\u3089\u8907\u6570\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u3088\u308a\u7c21\u6f54\u306a\u65b9\u6cd5\u3067\u62bd\u51fa\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002.<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>let person = { firstName: \"John\", lastName: \"Doe\" };\r\nlet { firstName, lastName } = person;<\/code><\/pre>\n<\/div>\n<h2 id=\"7-%d9%85%d9%82%d8%a7%d8%af%db%8c%d8%b1-%d9%be%db%8c%d8%b4%d9%81%d8%b1%d8%b6%d8%8c-rest-%d9%88-spread\">7. \u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3001Rest\u3068Spread<\/h2>\n<p><strong>ES5<\/strong><strong>:<\/strong> \u30c7\u30d5\u30a9\u30eb\u30c8\u3001\u6b8b\u308a\u3001\u307e\u305f\u306f\u30b9\u30d7\u30ec\u30c3\u30c9\u5024\u306e\u7ba1\u7406\u306f\u624b\u52d5\u3067\u884c\u308f\u308c\u3066\u3044\u307e\u3057\u305f\u3002.<br \/>\n<strong>ES6:<\/strong> \u95a2\u6570\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3001\u30d1\u30e9\u30e1\u30fc\u30bf <code inline=\"\">...\u4f11\u3080<\/code> \u5f15\u6570\u3068\u6f14\u7b97\u5b50\u3092\u53ce\u96c6\u3059\u308b <code inline=\"\">...\u5e83\u3081\u308b<\/code> \u914d\u5217\u307e\u305f\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u62e1\u5f35\u3059\u308b\u305f\u3081\u306b\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002.<\/p>\n<h2 id=\"8-%d9%85%d8%a7%da%98%d9%88%d9%84%d9%87%d8%a7-modules\">8. \u30e2\u30b8\u30e5\u30fc\u30eb<\/h2>\n<p><strong>ES5:<\/strong> \u30cd\u30a4\u30c6\u30a3\u30d6\u30e2\u30b8\u30e5\u30fc\u30eb\u30b7\u30b9\u30c6\u30e0\u306f\u5b58\u5728\u305b\u305a\u3001\u958b\u767a\u8005\u306fCommonJS\u3084AMD\u3068\u3044\u3063\u305f\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3057\u305f\u3002.<br \/>\n<strong>ES6:<\/strong> \u30cd\u30a4\u30c6\u30a3\u30d6\u30e2\u30b8\u30e5\u30fc\u30eb\u30b7\u30b9\u30c6\u30e0\u3092\u4f7f\u7528\u3057\u305f <code inline=\"\">\u8f38\u5165<\/code> \u305d\u3057\u3066 <code inline=\"\">\u8f38\u51fa<\/code> \u7d39\u4ecb\u3055\u308c\u305f\u3002.<\/p>\n<h2 id=\"9-%d9%88%d8%b9%d8%af%d9%87%d9%87%d8%a7-promises\">9. \u7d04\u675f<\/h2>\n<p><strong>ES5:<\/strong> \u975e\u540c\u671f\u64cd\u4f5c\u306b\u306f\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u304c\u4f7f\u7528\u3055\u308c\u307e\u3057\u305f\u3002.<br \/>\n<strong>ES6:<\/strong> Promise \u306f\u3001\u975e\u540c\u671f\u64cd\u4f5c\u3092\u3088\u308a\u69cb\u9020\u5316\u3055\u308c\u305f\u65b9\u6cd5\u3067\u7ba1\u7406\u3059\u308b\u305f\u3081\u306b\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002.<\/p>\n<h2 id=\"10-%d8%ad%d9%84%d9%82%d9%87-for-of\">10. for-of\u30eb\u30fc\u30d7<\/h2>\n<p><strong>ES5:<\/strong> \u914d\u5217\u3092\u53cd\u5fa9\u51e6\u7406\u3059\u308b\u306b\u306f\u30eb\u30fc\u30d7\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002 <code inline=\"\">\u306e\u305f\u3081\u306b<\/code> \u307e\u305f\u306f <code inline=\"\">\u305d\u308c\u305e\u308c<\/code> \u4f7f\u7528\u3055\u308c\u307e\u3057\u305f\u3002.<br \/>\n<strong>ES6:<\/strong> \u6307\u8f2a <code inline=\"\">for-of<\/code> \u3053\u308c\u306f\u53cd\u5fa9\u53ef\u80fd\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53cd\u5fa9\u51e6\u7406\u3059\u308b\u305f\u3081\u306b\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002.<\/p>\n<h2 id=\"set%d8%8c-map%d8%8c-weakset%d8%8c-weakmap-11\">\u96c6\u5408\u3001\u30de\u30c3\u30d7\u3001\u5f31\u96c6\u5408\u3001\u5f31\u30de\u30c3\u30d7 11<\/h2>\n<p><strong>ES5:<\/strong> \u76f4\u63a5\u540c\u7b49\u306e\u3082\u306e\u306f\u3042\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002.<br \/>\n<strong>ES6:<\/strong> \u3053\u308c\u3089\u306e\u30bf\u30a4\u30d7\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306f\u3001\u30c7\u30fc\u30bf\u7ba1\u7406\u306e\u305f\u3081\u306b\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002.<\/p>\n<h2 id=\"12-%d9%86%d9%88%d8%b9-symbol\">12. \u30b7\u30f3\u30dc\u30eb\u306e\u7a2e\u985e<\/h2>\n<p><strong>ES5:<\/strong> \u305d\u3093\u306a\u4e8b\u306f\u7121\u304b\u3063\u305f\u3002.<br \/>\n<strong>ES6:<\/strong> \u30bf\u30a4\u30d7 <code inline=\"\">\u30b7\u30f3\u30dc\u30eb<\/code> \u4e00\u610f\u306e\u8b58\u5225\u5b50\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002.<\/p>\n<h2 id=\"13-%d8%b1%d9%88%d8%b4%d9%87%d8%a7%db%8c-%d8%a2%d8%b1%d8%a7%db%8c%d9%87-%d9%88-%d8%b4%db%8c%d8%a1\">13. \u914d\u5217\u3068\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30e1\u30bd\u30c3\u30c9<\/h2>\n<p><strong>ES5:<\/strong> \u9650\u5b9a\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u306e\u30bb\u30c3\u30c8\u3002.<br \/>\n<strong>ES6:<\/strong> \u65b0\u3057\u3044\u65b9\u6cd5 <code inline=\"\">\u914d\u5217.from<\/code>\u3001 <code inline=\"\">\u914d\u5217.of<\/code>\u3001 <code inline=\"\">\u30aa\u30d6\u30b8\u30a7\u30af\u30c8.\u5272\u308a\u5f53\u3066<\/code> \u306a\u3069\u306a\u3069\u3001\u3044\u308d\u3044\u308d\u7d39\u4ecb\u3055\u308c\u307e\u3057\u305f\u3002.<\/p>\n<h2 id=\"14-%d9%85%d8%af%db%8c%d8%b1%db%8c%d8%aa-%d9%be%d8%a7%d8%b1%d8%a7%d9%85%d8%aa%d8%b1%d9%87%d8%a7\">14. \u30d1\u30e9\u30e1\u30fc\u30bf\u7ba1\u7406<\/h2>\n<p><strong>ES5:<\/strong> \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3059\u308b\u30d1\u30e9\u30e1\u30fc\u30bf <code inline=\"\">\u8b70\u8ad6<\/code> \u30a2\u30af\u30bb\u30b9\u304c\u8a31\u53ef\u3055\u308c\u307e\u3057\u305f\u3002.<br \/>\n<strong>ES6:<\/strong> \u30d1\u30e9\u30e1\u30fc\u30bf\u7ba1\u7406\u306e\u76f4\u63a5\u30b5\u30dd\u30fc\u30c8 <code inline=\"\">\u4f11\u3080<\/code>\u3001 <code inline=\"\">\u30c7\u30d5\u30a9\u30eb\u30c8<\/code> \u305d\u3057\u3066 <code inline=\"\">\u5e83\u3081\u308b<\/code>.<\/p>\n<h2 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