{"id":48,"date":"2023-09-13T00:31:46","date_gmt":"2023-04-28T17:15:37","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/javascript%e3%81%a7%e3%81%aereferenceerror%e3%80%81syntaxerror%e3%80%81typeerror%e3%81%ae%e3%83%88%e3%83%a9%e3%83%96%e3%83%ab%e3%82%b7%e3%83%a5%e3%83%bc%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0\/"},"modified":"2025-07-31T13:39:22","modified_gmt":"2025-07-31T04:39:22","slug":"javascript%e3%81%a7%e3%81%aereferenceerror%e3%80%81syntaxerror%e3%80%81typeerror%e3%81%ae%e3%83%88%e3%83%a9%e3%83%96%e3%83%ab%e3%82%b7%e3%83%a5%e3%83%bc%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/javascript%e3%81%a7%e3%81%aereferenceerror%e3%80%81syntaxerror%e3%80%81typeerror%e3%81%ae%e3%83%88%e3%83%a9%e3%83%96%e3%83%ab%e3%82%b7%e3%83%a5%e3%83%bc%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0\/","title":{"rendered":"JavaScript\u3067\u306e’ReferenceError’\u3001’SyntaxError’\u3001’TypeError’\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u65b9\u6cd5"},"content":{"rendered":"

\u30a4\u30f3\u30c8\u30ed\u30c0\u30af\u30b7\u30e7\u30f3<\/h3>\n

JavaScript\u306f\u3001\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9\u304a\u3088\u3073\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u306e\u958b\u767a\u3067\u4f7f\u7528\u3055\u308c\u308b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3059\u3002JavaScript\u3092\u4f7f\u3046\u969b\u306b\u306f\u3001\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u89e3\u8aad\u304c\u5c11\u3057\u96e3\u3057\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5185\u306e\u554f\u984c\u3092\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u3059\u308b\u969b\u306b\u3001\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u4f55\u3092\u6307\u3057\u3066\u3044\u308b\u306e\u304b\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u91cd\u8981\u3067\u3059\u3002\u5e78\u3044\u306a\u3053\u3068\u306b\u3001\u73fe\u4ee3\u306e\u30d6\u30e9\u30a6\u30b6\u306b\u306f\u7d44\u307f\u8fbc\u307f\u306e\u30c7\u30d0\u30c3\u30b0\u30c4\u30fc\u30eb\u304c\u4ed8\u5c5e\u3057\u3066\u304a\u308a\u3001\u3053\u308c\u306b\u3088\u3063\u3066\u52a9\u3051\u3092\u53d7\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5404\u30d6\u30e9\u30a6\u30b6\u306f\u3001\u8996\u899a\u7684\u306a\u8868\u73fe\u306b\u304a\u3044\u3066\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u7570\u306a\u308b\u65b9\u6cd5\u3067\u6271\u3044\u307e\u3059\u304c\u3001\u305d\u308c\u3067\u3082\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306fJavaScript\u30b3\u30fc\u30c9\u306b\u4f55\u304c\u8d77\u3053\u3063\u3066\u3044\u308b\u304b\u3092\u77e5\u308b\u624b\u304c\u304b\u308a\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001\u30d6\u30e9\u30a6\u30b6\u74b0\u5883\u3067\u8868\u793a\u3055\u308c\u308b3\u3064\u306e\u4e00\u822c\u7684\u306aJavaScript\u30a8\u30e9\u30fc\u30bf\u30a4\u30d7\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\uff1aReferenceError\u3001SyntaxError\u3001\u304a\u3088\u3073TypeError\u3002\u4e00\u7dd2\u306b\u9032\u3081\u308b\u305f\u3081\u306b\u306f\u3001JavaScript\u3068\u958b\u767a\u8005\u30b3\u30f3\u30bd\u30fc\u30eb\u306e\u7406\u89e3\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n

\u79c1\u305f\u3061\u306eJavaScript\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001JavaScript\u306b\u3064\u3044\u3066\u3055\u3089\u306b\u591a\u304f\u306e\u3053\u3068\u3092\u5b66\u3076\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001JavaScript\u958b\u767a\u8005\u30b3\u30f3\u30bd\u30fc\u30eb\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u306f\u5f53\u793e\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u5b66\u3076\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u4ee5\u4e0b\u306e\u4f8b\u306f\u7db2\u7f85\u7684\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u906d\u9047\u3059\u308b\u53ef\u80fd\u6027\u306e\u3042\u308b\u4e00\u822c\u7684\u306a\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u5165\u9580\u3068\u3057\u3066\u6a5f\u80fd\u3057\u307e\u3059\u3002\u3055\u3089\u306b\u3001\u4f8b\u306b\u793a\u3055\u308c\u3066\u3044\u308b\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306fChrome\u30a6\u30a7\u30d6\u30d6\u30e9\u30a6\u30b6\u304b\u3089\u306e\u3082\u306e\u3067\u3059\u3002Firefox\u3084Edge\u304b\u3089\u53d7\u3051\u53d6\u308b\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u306f\u308f\u305a\u304b\u306b\u7570\u306a\u308b\u30e1\u30c3\u30bb\u30fc\u30b8\u30f3\u30b0\u304c\u542b\u307e\u308c\u308b\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u304c\u3001\u30a8\u30e9\u30fc\u306e\u7a2e\u985e\u306f\u540c\u3058\u3067\u3059\u3002<\/p>\n

JavaScript\u306e\u30a8\u30e9\u30fc\u30bf\u30a4\u30d7\u306e\u7406\u89e3<\/h2>\n

JavaScript\u306e\u30a8\u30e9\u30fc\u306f\u3001\u30a8\u30e9\u30fc\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u57fa\u3065\u3044\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u767a\u751f\u3057\u305f\u30a8\u30e9\u30fc\u306e\u30bf\u30a4\u30d7\u306b\u95a2\u3059\u308b\u60c5\u5831\u304c\u542b\u307e\u308c\u305f\u7d44\u307f\u8fbc\u307f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3042\u308a\u3001\u305d\u306e\u5f8c\u306b\u539f\u56e0\u306e\u53ef\u80fd\u6027\u306b\u3064\u3044\u3066\u8a73\u7d30\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u7d9a\u304d\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u6b21\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u906d\u9047\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

VM170:1 Uncaught ReferenceError: shark is not defined\r\n    at <anonymous>:1:1\r\n<\/code><\/pre>\n
\u3053\u306e\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u89e3\u6790\u3059\u308b\u3068\u3001\u7279\u5b9a\u3055\u308c\u305f\u30a8\u30e9\u30fc\u306fReferenceError\u306e\u30bf\u30a4\u30d7\u3067\u3042\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002\u30bb\u30df\u30b3\u30ed\u30f3\u306e\u5f8c\u308d\u306b\u306f\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308a\u3001\u305d\u306e\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u300cshark\u306f\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u300d\u3068\u8ff0\u3079\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u6700\u5f8c\u306e\u884c\u306b\u306f\u3001\u30a8\u30e9\u30fc\u304c\u30b3\u30fc\u30c9\u306e1:1\u306e\u5834\u6240\u3067\u767a\u751f\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u8a73\u7d30\u306b\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u30d6\u30e9\u30a6\u30b6\u3067\u30a8\u30e9\u30fc\u304c\u691c\u77e5\u3055\u308c\u305f\u5834\u5408\u3001\u30a8\u30e9\u30fc\u306e\u30bf\u30a4\u30d7\u3068\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u3088\u3063\u3066\u554f\u984c\u304c\u793a\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u60c5\u5831\u3092\u57fa\u306b\u3057\u3066\u3001\u53d7\u3051\u53d6\u3063\u305f\u30a8\u30e9\u30fc\u30bf\u30a4\u30d7\u3068\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u57fa\u3065\u3044\u3066\u30c7\u30d0\u30c3\u30b0\u306e\u65b9\u6cd5\u3092\u5224\u65ad\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
ReferenceError\u3092\u7406\u89e3\u3059\u308b<\/h2>\n
\u672a\u4f5c\u6210\u306e\u5909\u6570\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001ReferenceError\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u307e\u305f\u3001\u521d\u671f\u5316\u3059\u308b\u524d\u306b\u5909\u6570\u3092\u547c\u3073\u51fa\u3059\u3068\u3001\u540c\u69d8\u306bReferenceError\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n
\u672a\u5b9a\u7fa9\u306e\u5909\u6570\u306b\u51fa\u304f\u308f\u3059\u3053\u3068<\/h3>\n
\u4f8b\u3048\u3070\u3001console.log()\u3092\u5b9f\u884c\u3059\u308b\u969b\u306b\u5909\u6570\u540d\u3092\u8aa4\u3063\u3066\u5165\u529b\u3059\u308b\u3068\u3001ReferenceError\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n
let<\/span> sammy =<\/span> 'A Shark dreaming of the cloud.'<\/span>;<\/span>\r\n\r\nconsole.<\/span>log<\/span>(<\/span>sammmy)<\/span>;<\/span>\r\n<\/code><\/pre>\n
<\/code><\/pre>\n
Output<\/div>\n
<\/code><\/pre>\n
Uncaught ReferenceError: sammmy is not defined at <anonymous>:1:13<\/p>\n
<\/code><\/pre>\n
\u5909\u6570\u300csammmy\u300d\u306f\u5b58\u5728\u305b\u305a\u3001\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002\u3053\u306e\u30a8\u30e9\u30fc\u3092\u4fee\u6b63\u3059\u308b\u305f\u3081\u306b\u3001\u5909\u6570\u3092\u6b63\u3057\u3044\u30b9\u30da\u30eb\u306b\u66f4\u65b0\u3057\u3066\u30b3\u30de\u30f3\u30c9\u3092\u518d\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6210\u529f\u3059\u308b\u3068\u3001\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u8868\u793a\u3055\u308c\u307e\u305b\u3093\u3002\u5168\u4f53\u7684\u306b\u3001\u30b3\u30fc\u30c9\u306e\u30b9\u30da\u30eb\u30df\u30b9\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3067\u672a\u5b9a\u7fa9\u306e\u5909\u6570\u30a8\u30e9\u30fc\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u5909\u6570\u304c\u5ba3\u8a00\u3055\u308c\u308b\u524d\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b<\/h3>\n
\u540c\u69d8\u306b\u3001\u30b3\u30fc\u30c9\u5185\u3067\u5909\u6570\u304c\u5ba3\u8a00\u3055\u308c\u308b\u524d\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u6b21\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
function<\/span> sharkName<\/span>(<\/span>)<\/span> {<\/span>\r\n    console.<\/span>log<\/span>(<\/span>shark)<\/span>;<\/span>\r\n\r\n    let<\/span> shark =<\/span> 'sammy'<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
<\/code><\/pre>\n
Output<\/div>\n
<\/code><\/pre>\n
VM223:2 Uncaught ReferenceError: Cannot access ‘shark’ before initialization at sharkName (<anonymous>:2:17) at <anonymous>:1:1<\/p>\n
<\/code><\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001shark\u5909\u6570\u304c\u5ba3\u8a00\u3055\u308c\u308b\u524d\u306bconsole.log(shark)\u304c\u5b9f\u884c\u3055\u308c\u308b\u305f\u3081\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u4e00\u822c\u7684\u306b\u3001\u30a2\u30af\u30bb\u30b9\u3059\u308b\u524d\u306b\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u3053\u3068\u304c\u826f\u3044\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3067\u3059\u3002<\/p>\n
\n
Note<\/p>\n
\u6ce8\u610f\uff1alet\u304a\u3088\u3073const\u5ba3\u8a00\u306e\u52d5\u4f5c\u65b9\u6cd5\u306e\u305f\u3081\u306b\u3001\u5ba3\u8a00\u306f\u5dfb\u304d\u4e0a\u3052\u3089\u308c\u307e\u3059\u304c\u3001\u524d\u306e\u4f8b\u3067\u306f\u73fe\u5728\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u305b\u3093\u3002\u3053\u306e\u3088\u3046\u306a\u5834\u5408\u3001let\u304a\u3088\u3073const\u5909\u6570\u306f\u300c\u4e00\u6642\u7684\u306a\u30c7\u30c3\u30c9\u30be\u30fc\u30f3\u300d\u3068\u547c\u3070\u308c\u308b\u72b6\u614b\u306b\u5165\u308a\u307e\u3059\u3002\u3053\u308c\u3092\u56de\u907f\u3059\u308b\u305f\u3081\u306b\u3001\u30b9\u30b3\u30fc\u30d7\u306e\u6700\u521d\u3067let\u304a\u3088\u3073const\u5909\u6570\u3092\u5ba3\u8a00\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/div>\n<\/div>\n
\u30b3\u30fc\u30c9\u306e\u4f8b\u3092\u4fee\u6b63\u3059\u308b\u305f\u3081\u306b\u3001console.log()\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u524d\u306bshark\u5909\u6570\u3092\u5ba3\u8a00\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
function<\/span> sharkName<\/span>(<\/span>)<\/span> {<\/span>\r\n    let<\/span> shark =<\/span> 'sammy'<\/span>;<\/span>\r\n\r\n    console.<\/span>log<\/span>(<\/span>shark)<\/span>;<\/span><\/mark>\r\n}<\/span>\r\n<\/code><\/pre>\n
ReferenceError\u306f\u3001\u5909\u6570\u3068\u30b9\u30b3\u30fc\u30d7\u306b\u3057\u3070\u3057\u3070\u95a2\u9023\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306e\u7bc4\u56f2\u3092\u8d85\u3048\u3066\u3001JavaScript\u306e\u5909\u6570\u3001\u30b9\u30b3\u30fc\u30d7\u3001\u304a\u3088\u3073\u5dfb\u304d\u4e0a\u3052\u306b\u3064\u3044\u3066\u306f\u3001Understanding Variables, Scope, and Hoisting in JavaScript\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u8a73\u3057\u304f\u5b66\u3076\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u69cb\u6587\u30a8\u30e9\u30fc\u3092\u7406\u89e3\u3059\u308b<\/h2>\n
JavaScript\u306e\u30a4\u30f3\u30bf\u30fc\u30d7\u30ea\u30bf\u30fc\u304c\u30b3\u30fc\u30c9\u3092\u8abf\u3079\u308b\u969b\u3001\u8a00\u8a9e\u4ed5\u69d8\u306b\u5f93\u308f\u306a\u3044\u30b3\u30fc\u30c9\u304c\u898b\u3064\u304b\u308b\u3068SyntaxError\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3082\u3057\u767a\u751f\u3057\u305f\u5834\u5408\u3001\u30b3\u30fc\u30c9\u306e\u5b9f\u884c\u306f\u505c\u6b62\u3055\u308c\u3001\u69cb\u6587\u306b\u95a2\u3059\u308b\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u30b3\u30fc\u30c9\u306e\u6b20\u843d\u3057\u3066\u3044\u308b\u7b87\u6240<\/h3>\n
\u4f8b\u3048\u3070\u3001\u95a2\u6570\u3092\u66f8\u3044\u3066\u3044\u308b\u969b\u306b\u3001\u30b3\u30fc\u30c9\u3092\u56f2\u3080\u305f\u3081\u306b\u30ab\u30c3\u30b3 ) \u3092\u5fd8\u308c\u308b\u3068\u3001\u629c\u3051\u3066\u3044\u308b\u90e8\u5206\u306b\u95a2\u3059\u308b\u5177\u4f53\u7684\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8a18\u3055\u308c\u305f SyntaxError \u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n
function<\/span> sammy<\/span>(<\/span>animal<\/span>)<\/span> {<\/span>\r\n    if<\/span>(<\/span>animal ==<\/span> 'shark'<\/span>)<\/span>{<\/span>\r\n        return<\/span> `<\/span>I'm cool<\/span>`<\/span><\/span>;<\/span>\r\n    }<\/span> else<\/span> {<\/span>\r\n        return<\/span> `<\/span>You're cool<\/span>`<\/span><\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nsammy<\/span>(<\/span>'shark'<\/span>;<\/span>\r\n<\/code><\/pre>\n
<\/code><\/pre>\n
Output<\/div>\n
<\/code><\/pre>\n
Uncaught SyntaxError: missing ) after argument list<\/p>\n
<\/code><\/pre>\n
\u5e78\u3044\u306a\u3053\u3068\u306b\u3001\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u30b3\u30fc\u30c9\u5185\u306e\u4e0d\u8db3\u3057\u3066\u3044\u308b\u8981\u7d20\u3092\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u4f8b\u3067\u306f\u3001sammy\u95a2\u6570\u306e\u547c\u3073\u51fa\u3057\u306b\u306f\u9589\u3058\u308b\uff09\u30ab\u30c3\u30b3\u304c\u4e0d\u8db3\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
.<\/span> .<\/span> .<\/span>\r\n\r\nsammy<\/span>(<\/span>'shark'<\/span>)<\/span><\/mark>;<\/span>\r\n<\/code><\/pre>\n
\u95a2\u6570\u306e\u7d42\u308f\u308a\u306e\u30ab\u30fc\u30ea\u30fc\u30d6\u30ec\u30fc\u30b9(})\u3084\u914d\u5217\u306e\u30d6\u30e9\u30b1\u30c3\u30c8(])\u3092\u7701\u7565\u3059\u308b\u3068\u3001\u540c\u69d8\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u95a2\u6570\u3001\u914d\u5217\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u9069\u5207\u306b\u9589\u3058\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u540c\u3058\u5909\u6570\u540d\u3092\u5ba3\u8a00\u3059\u308b<\/h3>\n
\u4ee5\u4e0b\u306e\u4f8b\u3067\u306f\u3001\u95a2\u6570\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3068\u95a2\u6570\u672c\u4f53\u5185\u3067\u540c\u3058\u5909\u6570\u540d\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u306b\u3082\u3001\u3053\u306e\u30a8\u30e9\u30fc\u306b\u906d\u9047\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
function<\/span> sammy<\/span>(<\/span>animal<\/span><\/mark>)<\/span> {<\/span>\r\n    let<\/span> animal<\/mark> =<\/span> 'shark'<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
<\/code><\/pre>\n
Output<\/div>\n
<\/code><\/pre>\n
VM132:2 Uncaught SyntaxError: Identifier ‘animal’ has already been declared<\/p>\n
<\/code><\/pre>\n
\u30a8\u30e9\u30fc\u3092\u4fee\u6b63\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u95a2\u6570\u672c\u4f53\u5185\u3067\u4e00\u610f\u3067\u5177\u4f53\u7684\u306a\u5909\u6570\u540d\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u65b0\u3057\u3044\u5909\u6570\u540d\uff08\u4f8b\u3048\u3070animalType\u306a\u3069\uff09\u3092\u5ba3\u8a00\u3059\u308b\u3053\u3068\u3067\u3001\u95a2\u6570\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u3068\u672c\u4f53\u5185\u306elet\u5909\u6570\u3068\u306e\u7af6\u5408\u3092\u89e3\u6d88\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
function<\/span> sammy<\/span>(<\/span>animal<\/span>)<\/span> {<\/span>\r\n    let<\/span> animalType<\/mark> =<\/span> 'shark'<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u95a2\u6570\u672c\u4f53\u5185\u3067\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u5909\u66f4\u3057\u305f\u308a\u4f7f\u7528\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u540c\u3058\u5909\u6570\u540d\u3092\u6301\u3064\u5909\u6570\u5ba3\u8a00\u3092\u4f7f\u7528\u3057\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002\u4f8b\u3048\u3070\u3001\u672c\u4f53\u5185\u306elet\u5ba3\u8a00\u3092\u524a\u9664\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
function<\/span> sammy<\/span>(<\/span>animal<\/span>)<\/span> {<\/span>\r\n    animal<\/mark> =<\/span> 'shark'<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u95a2\u6570\u672c\u4f53\u5185\u5916\u3067\u5909\u6570\u3092\u6271\u3046\u5834\u5408\u306b\u306f\u3001\u30e6\u30cb\u30fc\u30af\u306a\u540d\u524d\u3092\u4ed8\u3051\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u95a2\u6570\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u969b\u306b\u306f\u3001let\u306e\u3088\u3046\u306a\u5909\u6570\u5ba3\u8a00\u306a\u3057\u306b\u95a2\u6570\u672c\u4f53\u5185\u3067\u305d\u308c\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u4e88\u671f\u3057\u306a\u3044\u30c8\u30fc\u30af\u30f3\u306e\u7279\u5b9a<\/h3>\n
\u30b3\u30fc\u30c9\u306b\u306f\u3001]\u3084}\u3068\u3044\u3063\u305f\u62ec\u5f27\u3092\u898b\u843d\u3068\u3059\u3088\u3046\u306b\u3001\u6642\u306b\u306f\u5c0f\u3055\u306a\u304c\u91cd\u8981\u306a\u8ffd\u52a0\u304c\u5fc5\u8981\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\uff1a<\/p>\n
let<\/span> sharkCount =<\/span> 0<\/span>;<\/span>\r\n\r\nfunction<\/span> sammy<\/span>(<\/span>)<\/span> {<\/span>\r\n    sharkCount+<\/span>;<\/span>\r\n    console.<\/span>log<\/span>(<\/span>sharkCount)<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
<\/code><\/pre>\n
Output<\/div>\n
<\/code><\/pre>\n
Uncaught SyntaxError: Unexpected token ‘;’<\/p>\n
<\/code><\/pre>\n
\u3053\u306e\u4f8b\u3067\u306e\u8ffd\u52a0\u8981\u7d20\u306f\u3001\u95a2\u6570\u672c\u4f53\u5185\u306esharkCount\u306e\u5f8c\u306b\u3042\u308b\u300c+\u300d\u30d7\u30e9\u30b9\u8a18\u53f7\u3067\u3059\u3002<\/p>\n
.<\/span> .<\/span> .<\/span>\r\nfunction<\/span> sammy<\/span>(<\/span>)<\/span> {<\/span>\r\n    sharkCount++<\/mark><\/span>;<\/span>\r\n    console.<\/span>log<\/span>(<\/span>sharkCount)<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
SyntaxError: Unexpected token\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306f\u3001\u30d7\u30e9\u30b9\u8a18\u53f7\uff08+\uff09\u306a\u3069\u3001\u6f14\u7b97\u5b50\u304c\u4e0d\u8db3\u3057\u3066\u3044\u308b\u304b\u8ffd\u52a0\u3055\u308c\u3066\u3044\u306a\u3044\u304b\u3092\u30b3\u30fc\u30c9\u3092\u518d\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
TypeError\u3092\u7406\u89e3\u3059\u308b<\/h2>\n
TypeError\u306f\u3001\u95a2\u6570\u3084\u5909\u6570\u306e\u5024\u304c\u4e88\u671f\u3057\u306a\u3044\u30bf\u30a4\u30d7\u306e\u5834\u5408\u306b\u767a\u751f\u3057\u307e\u3059\u3002JavaScript\u306e\u7570\u306a\u308b\u30c7\u30fc\u30bf\u30bf\u30a4\u30d7\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u5b66\u3076\u306b\u306f\u3001\u5f0a\u793e\u306e\u300cJavaScript\u306b\u304a\u3051\u308b\u30c7\u30fc\u30bf\u30bf\u30a4\u30d7\u306e\u7406\u89e3\u300d\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u914d\u5217\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n
\u4e00\u822c\u7684\u306a\u9593\u9055\u3044\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53cd\u5fa9\u51e6\u7406\u3059\u308b\u305f\u3081\u306b\u914d\u5217\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001.map() \u30e1\u30bd\u30c3\u30c9\u306f\u914d\u5217\u56fa\u6709\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308b\u305f\u3081\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30eb\u30fc\u30d7\u51e6\u7406\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n
const<\/span> sharks =<\/span> {<\/span>\r\n    shark1<\/span>:<\/span> 'sammy'<\/span>,<\/span>\r\n    shark2<\/span>:<\/span> 'shelly'<\/span>,<\/span>\r\n    shark3<\/span>:<\/span> 'sheldon'<\/span>\r\n}<\/span>\r\n\r\nsharks.<\/span>map<\/span>(<\/span>(<\/span>shark<\/span>)<\/span> =><\/span> `<\/span>Hello there <\/span>${<\/span>shark}<\/span><\/span>!<\/span>`<\/span><\/span>)<\/span>;<\/span>\r\n<\/code><\/pre>\n
<\/code><\/pre>\n
Output<\/div>\n
<\/code><\/pre>\n
Uncaught TypeError: sharks.map is not a function at <anonymous>:1:8<\/p>\n
<\/code><\/pre>\n
\u524d\u306e\u4f8b\u3092\u4fee\u6b63\u3059\u308b\u305f\u3081\u306e1\u3064\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u306f\u3001for…in\u30eb\u30fc\u30d7\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u3053\u308c\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30c7\u30fc\u30bf\u578b\u306b\u5bfe\u3057\u3066\u6a5f\u80fd\u3057\u3001sharks\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089\u5024\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/p>\n
const<\/span> sharks =<\/span> {<\/span>\r\n    shark1<\/span>:<\/span> 'sammy'<\/span>,<\/span>\r\n    shark2<\/span>:<\/span> 'shelly'<\/span>,<\/span>\r\n    shark3<\/span>:<\/span> 'sheldon'<\/span>\r\n}<\/span>\r\n\r\nfor<\/span> (<\/span>let<\/span> key in<\/span> sharks)<\/span> {<\/span><\/mark>\r\n    console.<\/span>log<\/span>(<\/span>`<\/span>Hello there <\/span>${<\/span>sharks[<\/span>key]<\/span>}<\/span><\/span>!<\/span>`<\/span><\/span>)<\/span>;<\/span><\/mark>\r\n}<\/span><\/mark>\r\n<\/code><\/pre>\n
\u9078\u629e\u80a2\u3068\u3057\u3066\u306f\u3001\u30b7\u30e3\u30fc\u30af\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u914d\u5217\u306b\u5909\u63db\u3057\u3066\u3001.map()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
const<\/span> sharks =<\/span> [<\/span>'sammy'<\/span>,<\/span> 'shelly'<\/span>,<\/span> 'sheldon'<\/span>]<\/span>;<\/span>\r\n\r\nsharks.<\/span>map<\/span>(<\/span>(<\/span>shark<\/span>)<\/span> =><\/span> `<\/span>Hello there <\/span>${<\/span>shark}<\/span><\/span>!<\/span>`<\/span><\/span>)<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u7570\u306a\u308b\u914d\u5217\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u64cd\u4f5c\u3059\u308b\u969b\u306b\u306f\u3001\u7570\u306a\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u9593\u9055\u3048\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u64cd\u4f5c\u3057\u3066\u3044\u308b\u30c7\u30fc\u30bf\u306e\u7a2e\u985e\u306b\u9069\u3057\u305f\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u304b\u3001\u518d\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u9069\u5207\u306a\u7834\u58ca\u7684\u5206\u5272\u6cd5\u3092\u4f7f\u7528\u3059\u308b\u3002<\/h3>\n
\u540c\u69d8\u306b\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u914d\u5217\u306e\u5206\u5272\u4ee3\u5165\u3068\u3057\u3066\u53cd\u5fa9\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001TypeError\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n
const<\/span> shark =<\/span> {<\/span>\r\n    name<\/span>:<\/span> 'sammy'<\/span>,<\/span>\r\n    age<\/span>:<\/span> 12<\/span>,<\/span>\r\n    cloudPlatform<\/span>:<\/span> 'Silicon Cloud'<\/span>\r\n}<\/span>\r\n\r\nconst<\/span> [<\/span>name,<\/span> age,<\/span> cloudPlatform]<\/span> =<\/span> sharks;<\/span>\r\n<\/code><\/pre>\n
<\/code><\/pre>\n
Output<\/div>\n
<\/code><\/pre>\n
VM23:7 Uncaught TypeError: sharks is not iterable at <anonymous>:7:26<\/p>\n
<\/code><\/pre>\n
\u3053\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u65b9\u6cd5\u306e\u4e00\u3064\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ad\u30fc\u306b\u57fa\u3065\u3044\u3066\u65b0\u3057\u3044\u5909\u6570\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5206\u5272\u4ee3\u5165\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n
const<\/span> shark =<\/span> {<\/span>\r\n    name<\/span>:<\/span> 'sammy'<\/span>,<\/span>\r\n    age<\/span>:<\/span> 12<\/span>,<\/span>\r\n    cloudPlatform<\/span>:<\/span> 'Silicon Cloud'<\/span>\r\n}<\/span>\r\n\r\nconst<\/span> {<\/span>name,<\/span> age,<\/span> cloudPlatform}<\/span> =<\/span> shark;<\/span><\/mark>\r\n\r\nconsole.<\/span>log<\/span>(<\/span>name)<\/span>;<\/span><\/mark>\r\n<\/code><\/pre>\n
<\/code><\/pre>\n
Output<\/div>\n
<\/code><\/pre>\n
sammy<\/p>\n
<\/code><\/pre>\n
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\u7d50\u8ad6<\/h2>\n
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JavaScript\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30e1\u30bd\u30c3\u30c9\u3068\u914d\u5217\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u5b66\u3076\u3053\u3068\u3067\u3001\u305d\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u3069\u306e\u3088\u3046\u306b\u6d3b\u7528\u3059\u308c\u3070\u826f\u3044\u304b\u3092\u3088\u308a\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
Google Chrome DevTools\u3068Visual Studio Code\u3092\u4f7f\u7528\u3057\u305fJavaScript\u306e\u30c7\u30d0\u30c3\u30b0\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001\u5f53\u793e\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u3082\u8a73\u3057\u304f\u5b66\u3076\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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