{"id":4654,"date":"2024-03-10T15:28:27","date_gmt":"2024-03-10T06:28:27","guid":{"rendered":"https:\/\/taitan916.info\/blog\/?p=4654"},"modified":"2024-02-19T17:44:08","modified_gmt":"2024-02-19T08:44:08","slug":"post-4654","status":"publish","type":"post","link":"https:\/\/taitan916.info\/blog\/archives\/4654","title":{"rendered":"JavaScript\u3067\u914d\u5217\u3092\u30b3\u30d4\u30fc\u5f8c\u306b\u5024\u5909\u66f4\u3057\u305f\u969b\u3001\u5143\u306e\u914d\u5217\u306e\u5024\u3082\u5909\u66f4\u3055\u308c\u308b\u70b9\u3092\u89e3\u6d88\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>JavaScript\u3067\u914d\u5217\u3092\u30b3\u30d4\u30fc\u5f8c\u306b\u5024\u5909\u66f4\u3057\u305f\u969b\u3001\u5143\u306e\u914d\u5217\u306e\u5024\u3082\u5909\u66f4\u3055\u308c\u3066\u3057\u307e\u3046\u3002\u300cconst array1 = array2\u300d\u306e\u3088\u3046\u306b\u30b3\u30d4\u30fc\u3059\u308b\u3068\u914d\u5217\u306e\u4e2d\u8eab\u304c\u5165\u308b\u308f\u3051\u3067\u306f\u306a\u304f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u53c2\u7167\u3059\u308b\u30a2\u30c9\u30ec\u30b9\u304c\u5165\u308b\u305f\u3081\u66f8\u304d\u63db\u308f\u3063\u3066\u3057\u307e\u3046\u6a21\u69d8\u3002<a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Operators\/Spread_syntax\" target=\"_blank\" rel=\"noopener\">\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587<\/a>\u3068\u3044\u3046\u3082\u306e\u3067\u5bfe\u5fdc\u3067\u304d\u308b\u3088\u3046\u306a\u306e\u3067\u4ee5\u4e0b\u306b\u5b9f\u88c5\u65b9\u6cd5\u3092\u30e1\u30e2\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2>\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9<\/h2>\n<h3>NG\u30b1\u30fc\u30b9<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">const test_array1 = [100, 200];\r\nconst test_array2 = test_array1;\r\n\r\ntest_array2[0] = 300;\r\n\r\nconsole.log(test_array1); \/\/Array [ 300, 200 ]\r\nconsole.log(test_array2); \/\/Array [ 300, 200 ]<\/pre>\n<p>\u611f\u899a\u7684\u306b\u306ftest_array2\u306e\u307f\u66f8\u304d\u63db\u308f\u308a\u305d\u3046\u3060\u3051\u3069test_array1\u3082\u66f8\u304d\u63db\u308f\u308b\u3068\u3044\u3046NG\u30b1\u30fc\u30b9\u3002<\/p>\n<h3>OK\u30b1\u30fc\u30b9<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">const test_array1 = [100, 200];\r\nconst test_array2 = [...test_array1];\r\n\r\ntest_array2[0] = 300;\r\n\r\nconsole.log(test_array1); \/\/Array [ 100, 200 ]\r\nconsole.log(test_array2); \/\/Array [ 300, 200 ]<\/pre>\n<p>test_array2\u306e\u307f\u6b63\u5e38\u306b\u66f8\u304d\u63db\u308f\u3063\u305f\u70b9\u304c\u78ba\u8a8d\u3067\u304d\u308b\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2>\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587<\/h2>\n<h3>\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9<\/h3>\n<p><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Operators\/Spread_syntax\" target=\"_blank\" rel=\"noopener\">https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Operators\/Spread_syntax<\/a><\/p>\n<h3>\u4f7f\u3044\u3069\u3053\u308d<\/h3>\n<p>\u4eca\u56de\u306e\u3088\u3046\u306a\u914d\u5217\u306e\u30b3\u30d4\u30fc\u4ee5\u5916\u3067\u306f\u4ee5\u4e0b\u53c2\u8003\u30b5\u30a4\u30c8\u304c\u5206\u304b\u308a\u3084\u3059\u3044\u3002<\/p>\n<p><a href=\"https:\/\/zenn.dev\/robon\/articles\/4dd535ecb71d27\" target=\"_blank\" rel=\"noopener\">https:\/\/zenn.dev\/robon\/articles\/4dd535ecb71d27<\/a><\/p>\n<p><a href=\"https:\/\/qiita.com\/Nossa\/items\/e6f503cbb95c8e6967f8\" target=\"_blank\" rel=\"noopener\">https:\/\/qiita.com\/Nossa\/items\/e6f503cbb95c8e6967f8<\/a><\/p>\n<p>&nbsp;<\/p>\n<h2>\u6240\u611f<\/h2>\n<p>\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\u306b\u3064\u3044\u3066\u4f7f\u3044\u3069\u3053\u308d\u304c\u30a4\u30de\u30a4\u30c1\u5206\u304b\u3089\u305a\u3001\u307e\u305f\u3042\u307e\u308a\u898b\u6163\u308c\u306a\u3044\u69cb\u6587\u306e\u305f\u3081\u656c\u9060\u3057\u3066\u3044\u305f\u304c\u3001\u4eca\u56de\u306e\u3088\u3046\u306a\u30d4\u30f3\u30dd\u30a4\u30f3\u30c8\u306a\u4f7f\u3044\u3069\u3053\u308d\u304c\u5206\u304b\u3063\u305f\u306e\u306f\u52c9\u5f37\u306b\u306a\u3063\u305f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript\u3067\u914d\u5217\u3092\u30b3\u30d4\u30fc\u5f8c\u306b\u5024\u5909\u66f4\u3057\u305f\u969b\u3001\u5143\u306e\u914d\u5217\u306e\u5024\u3082\u5909\u66f4\u3055\u308c\u3066\u3057\u307e ... <\/p>\n","protected":false},"author":1,"featured_media":1067,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-4654","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts\/4654","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/comments?post=4654"}],"version-history":[{"count":2,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts\/4654\/revisions"}],"predecessor-version":[{"id":4657,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts\/4654\/revisions\/4657"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/media\/1067"}],"wp:attachment":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/media?parent=4654"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/categories?post=4654"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/tags?post=4654"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}