{"id":10073,"date":"2018-10-08T09:00:58","date_gmt":"2018-10-08T00:00:58","guid":{"rendered":"https:\/\/www.agent-grow.com\/self20percent\/?p=10073"},"modified":"2018-10-04T10:18:43","modified_gmt":"2018-10-04T01:18:43","slug":"javascript-seal-and-freeze","status":"publish","type":"post","link":"https:\/\/www.agent-grow.com\/self20percent\/2018\/10\/08\/javascript-seal-and-freeze\/","title":{"rendered":"\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u51cd\u7d50\uff01 JavaScript \u306e seal() \u3068 freeze()"},"content":{"rendered":"

\u4eca\u56de\u306f JavaScript \u3067\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u51cd\u7d50\u306b\u3064\u3044\u3066<\/h1>\n

\u3053\u3093\u306b\u3061\u306f\uff01\u6c5f\u5d5c\u3067\u3059\uff01<\/p>\n

\u7686\u3055\u3093\u4eca\u65e5\u3082 JavaScript \u66f8\u3044\u3066\u307e\u3059\u304b\uff1f<\/p>\n

\u4eca\u56de\u306f\u3042\u307e\u308a\u65e5\u306e\u5f53\u305f\u3089\u306a\u3044\u3068\u3053\u308d\u3067\u3059\u304c\u3001\u77e5\u3063\u3066\u304a\u304f\u3068\u5f79\u306b\u7acb\u3064\uff08\u304b\u3082\u3057\u308c\u306a\u3044\uff09\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u51cd\u7d50\u306b\u3064\u3044\u3066\u304a\u8a71\u3057\u307e\u3059\uff01<\/p>\n

\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u51cd\u7d50\u3068\u306f\u2026\uff1f<\/h1>\n

\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u51cd\u7d50\u3068\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\uff1f
\n\u51cd\u7d50\u3068\u306f\u3001\u4e00\u8a00\u3067\u8a00\u3048\u3070\u300c\u5909\u66f4\u3067\u304d\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u300d\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u306d\u3002<\/p>\n

\u3044\u308f\u3086\u308b\u5909\u6570\u306b\u5bfe\u3059\u308b\u5b9a\u6570\u3068\u547c\u3070\u308c\u308b\u30e4\u30c4\u3067\u3059\u306d\uff01
\nJava \u306a\u3093\u304b\u3060\u3068 final<\/code> \u3068\u3044\u3046\u4fee\u98fe\u5b50\u3092\u3064\u3051\u308b\u3053\u3068\u3067\u5b9f\u73fe\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u5b9f\u306f JavaScript \u306b\u3082 ES6 (\u6700\u8fd1\u306e\u4ed5\u69d8)\u304b\u3089\u306f\u5909\u6570\u5b9a\u7fa9\u306e\u969b\u306b const<\/code> \u3068\u3044\u3046\u3082\u306e\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u3066\u3001<\/p>\n

\nconst foo = &#039;\u6587\u5b57\u3092\u5165\u308c\u308b\u3088&#039;;\nfoo = &#039;\u5909\u66f4\u3059\u308b&#039;; \n<\/pre>\n
\u307f\u305f\u3044\u306b\u3059\u308b\u3068\u3001 foo<\/code> \u306f\u5b9a\u6570\u3068\u3057\u3066\u5b9a\u7fa9\u3067\u304d\u307e\u3059\u306e\u3067 2 \u884c\u76ee\u306e\u518d\u4ee3\u5165\u3067\u30a8\u30e9\u30fc\u3092\u767a\u751f\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u3053\u3046\u3044\u3063\u305f\u4ed5\u7d44\u307f\u304c\u3042\u308b\u3053\u3068\u3067\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u5185\u3067\u597d\u304d\u306b\u5909\u66f4\u3057\u3066\u307b\u3057\u304f\u306a\u3044\u5024\uff08DB \u3078\u306e\u63a5\u7d9a\u60c5\u5831\u3068\u304b\u3001\u3042\u308a\u307e\u3059\u3088\u306d\uff01\uff09\u3092
\n\u4fdd\u8b77\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u308b\u3001\u3068\u3044\u3046\u3053\u3068\u306a\u3093\u3067\u3059\u306d\u3002<\/p>\n
\u3067\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u306f\u3069\u3046\u3059\u308b\uff1f<\/h1>\n
\u3067\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u306f\u3069\u3046\u3067\u3057\u3087\u3046\u304b\u3001
\n\u6b21\u306e\u3088\u3046\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30ea\u30c6\u30e9\u30eb\u3092\u7528\u610f\u3057\u3066\u8a66\u3057\u3066\u307f\u308b\u3068<\/p>\n
\nconst foo = {hoge: &#039;test&#039;};\nfoo = {hoge: &#039;changed&#039;}; \n<\/pre>\n
\u3053\u308c\u306f\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u304c\u3057\u304b\u3057\u2026<\/p>\n
\nconst foo = {hoge: &#039;test&#039;};\nfoo.hoge = &#039;changed!&#039;; \nfoo.fuga = &#039;fuga&#039;\nconsole.log(foo);\n<\/pre>\n
\u3053\u308c\u3060\u3068\u3069\u3046\u3067\u3057\u3087\u3046\u304b\u3002\u7d50\u679c\u306f\u3053\u3061\u3089\u3002<\/p>\n
\n[object Object] {\n  fuga: &quot;fuga&quot;,\n  hoge: &quot;changed!&quot;\n}\n<\/pre>\n
\u898b\u4e8b\u306b foo.hoge<\/code> \u306e\u5024\u306f\u66f8\u304d\u63db\u3048\u3089\u308c\u3001\u65b0\u3057\u3044 fuga<\/code> \u3068\u3044\u3046\u5024\u3082\u8ffd\u52a0\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002
\n\uff08\u5b9f\u969b\u306b\u7686\u3055\u3093\u3082\u8a66\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u306d\u3002\uff09<\/p>\n
\u3058\u3064\u306f\u3001 const<\/code> \u3067\u306f\u518d\u4ee3\u5165\u306f\u9632\u3052\u307e\u3059\u304c\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e2d\u8eab\u307e\u3067\u306f\u4fdd\u8b77\u3067\u304d\u306a\u3044\u306e\u3067\u3059\u306d\u3002<\/p>\n
\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e2d\u8eab\u3082\u4e38\u3063\u3068\u4fdd\u8b77\u3059\u308b\u65b9\u6cd5\u306f\u306a\u3044\u306e\u3067\u3057\u3087\u3046\u304b\u2026\uff1f<\/p>\n
seal \u3067\u4fdd\u8b77\u3057\u3066\u307f\u308b<\/h1>\n
\u5b9f\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e2d\u8eab\u3092\u4fdd\u8b77\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002
\n\u305d\u308c\u304c\u3053\u3061\u3089\u3002<\/p>\n
\nObject.seal(foo);\n<\/pre>\n
Object.seal()<\/code> \u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6e21\u3057\u3066\u3042\u3052\u308b\u3053\u3068\u3067\u3001\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4fdd\u8b77\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n
\u8a66\u3057\u306b\u5148\u7a0b\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u65bd\u3057\u3066\u307f\u308b\u3068\u2026<\/p>\n
\nconst foo = {hoge: &#039;test&#039;};\nObject.seal(foo);\nfoo.hoge = &#039;changed!&#039;; \nfoo.fuga = &#039;fuga&#039;\nconsole.log(foo);\n<\/pre>\n
\n[object Object] {\n  hoge: &quot;changed!&quot;\n}\n<\/pre>\n
foo.fuga<\/code> \u306e\u8ffd\u52a0\u3092\u6291\u6b62\u3067\u304d\u307e\u3057\u305f\u306d\uff01
\n\u3061\u306a\u307f\u306b\u3001\u901a\u5e38\u3067\u306f\u3053\u306e\u3088\u3046\u306b\u305f\u3060\u7121\u8996\u3055\u308c\u308b\u3060\u3051\u306a\u306e\u3067\u3059\u304c\u3001
\nJavaScript \u30d5\u30a1\u30a4\u30eb\u306e\u5148\u982d\u306b \"use strict\";<\/code> \u3068\u66f8\u3044\u3066\u53b3\u683c\u30e2\u30fc\u30c9\u306b\u3059\u308c\u3070\u304d\u3061\u3093\u3068\u30a8\u30e9\u30fc\u304c\u51fa\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u305f\u3060\u3001\u3053\u308c\u3060\u3051\u3067\u306f\u3061\u3087\u3063\u3068\u307e\u3060\u5fc3\u3082\u3068\u306a\u3044\u3067\u3059\u306d\u3002
\nObject.seal()<\/code> \u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u8ffd\u52a0\u30fb\u524a\u9664\u3092\u6291\u6b62\u3067\u304d\u307e\u3059\u304c\u3001\u5909\u66f4\u306f\u6b62\u3081\u3089\u308c\u306a\u3044\u306e\u3067\u3059\u3002
\n\u3053\u308c\u306f\u3053\u308c\u3067\u4fbf\u5229\u3067\u3059\u304c\u3001\u3059\u3079\u3066\u306e\u5909\u66f4\u3092\u6291\u6b62\u3057\u305f\u3044\uff01\u3068\u3044\u3046\u4e8b\u3082\u3042\u308a\u307e\u3059\u3088\u306d\u3002
\n\u305d\u3093\u306a\u6642\u306f\u3069\u3046\u3059\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n
freeze \u3067\u51cd\u7d50\uff01<\/h1>\n
\u305d\u3093\u306a\u3068\u304d\u306e\u70ba\u306b Object.seal()<\/code> \u3088\u308a\u3082\u3055\u3089\u306b\u5f37\u3044\u3082\u306e\u304c\u3042\u308a\u307e\u3059\uff01
\n\u305d\u308c\u304c Object.freeze()<\/code> \u3067\u3059\u3002
\n\u96ea\u3060\u308b\u307e\u3064\u304f\u308d\u30fc\u26c4 \u30c9\u30a2\u3092\u958b\u3051\u3066\u30fc\u266a 1<\/a><\/sup><\/del><\/p>\n
\u306a\u3093\u3068\u306a\u304f\u4e88\u60f3\u306f\u3064\u3044\u3066\u3044\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u8a66\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\nconst foo = {hoge: &#039;test&#039;};\nObject.freeze(foo);\nfoo.hoge = &#039;changed!&#039;; \nfoo.fuga = &#039;fuga&#039;\nconsole.log(foo);\n<\/pre>\n
\u7d50\u679c\u306f\u3053\u3061\u3089<\/p>\n
\n[object Object] {\n  hoge: &quot;test&quot;\n}\n<\/pre>\n
\u78ba\u304b\u306b\u3059\u3079\u3066\u306e\u5909\u66f4\u3092\u7121\u8996\u3057\u3066\u3044\u307e\u3059\u306d\uff01
\n\u3053\u3061\u3089\u3082\u666e\u901a\u306b\u4f7f\u3046\u3060\u3051\u3067\u3059\u3068\u5909\u66f4\u3092\u7121\u8996\u3059\u308b\u3060\u3051\u3067\u3059\u304c\u3001\u53b3\u683c\u30e2\u30fc\u30c9\u306b\u3059\u308c\u3070\u304d\u3061\u3093\u3068\u30a8\u30e9\u30fc\u304c\u51fa\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4fdd\u8b77\u3082\u30d0\u30c3\u30c1\u30ea\u3067\u3059\u306d\uff01<\/p>\n
\u3053\u308c\u3067\u5b89\u5168\u306b JavaScript \u3092\u66f8\u304d\u307e\u3057\u3087\u3046\uff01<\/h1>\n
\u3061\u306a\u307f\u306b\u3001\u540c\u3058\u7cfb\u5217\u3067 Object.preventExtensions()<\/code> \u3068\u3044\u3046\u8ffd\u52a0\u306e\u307f\u3092\u6291\u5236\u3059\u308b\uff08\u5909\u66f4\u3084\u524a\u9664\u306f\u8a31\u53ef\uff09\u3068\u3044\u3046\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u304c\u3001
\n\u5927\u4f53 Object.seal()<\/code>\u3067\u4e8b\u8db3\u308a\u308b\u304b\u306a\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
\u67d4\u8edf\u6027\u304c\u9ad8\u3044\u306e\u304c JavaScript \u306e\u826f\u3055\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001
\n\u304d\u3063\u3061\u308a\u5b88\u308b\u3068\u3053\u308d\u306f\u5b88\u3063\u3066\u3001\u5b89\u5168\u306b JavaScript \u66f8\u304d\u307e\u3057\u3087\u3046\u306d\uff01<\/p>\n
\n
\n
    \n
  1. \n\u300c\u30a2\u30ca\u3068\u96ea\u306e\u5973\u738b\u300d\u306e\u82f1\u8a9e\u540d\u306f\u300cfrozen\u300d\u3060\u305d\u3046\u3067\u3059\u3088\uff01\u30b7\u30f3\u30d7\u30eb\uff01 ↩<\/a>\n<\/li>\n<\/ol>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
    \u4eca\u56de\u306f JavaScript \u3067\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u51cd\u7d50\u306b\u3064\u3044\u3066 \u3053\u3093\u306b\u3061\u306f\uff01\u6c5f\u5d5c\u3067\u3059\uff01 \u7686\u3055\u3093\u4eca\u65e5\u3082 JavaScript \u66f8\u3044\u3066\u307e\u3059\u304b\uff1f \u4eca\u56de\u306f\u3042\u307e\u308a\u65e5\u306e\u5f53\u305f\u3089\u306a\u3044\u3068\u3053\u308d\u3067\u3059\u304c\u3001\u77e5\u3063\u3066\u304a\u304f\u3068\u5f79\u306b\u7acb\u3064\uff08\u304b\u3082\u3057\u308c\u306a\u3044\uff09\u30aa\u30d6\u30b8 […]<\/p>\n","protected":false},"author":15,"featured_media":10081,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[10],"tags":[45],"class_list":["post-10073","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tech","tag-javascript"],"jetpack_featured_media_url":"https:\/\/www.agent-grow.com\/self20percent\/wp-content\/uploads\/2018\/10\/Artboard-1.png","jetpack_shortlink":"https:\/\/wp.me\/p7Bq4F-2Ct","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/posts\/10073","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/comments?post=10073"}],"version-history":[{"count":0,"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/posts\/10073\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/media\/10081"}],"wp:attachment":[{"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/media?parent=10073"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/categories?post=10073"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/tags?post=10073"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}