
{"id":9721,"date":"2025-08-01T11:41:50","date_gmt":"2025-08-01T02:41:50","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=9721"},"modified":"2025-08-01T11:41:51","modified_gmt":"2025-08-01T02:41:51","slug":"typescript-interface","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/typescript-interface\/","title":{"rendered":"\u3010TypeScript\u5165\u9580\u3011interface\u3067\u578b\u5b9a\u7fa9\u3092\u4f5c\u6210\u3059\u308b\uff01Type\u3068\u306e\u9055\u3044\u30fb\u4f7f\u3044\u5206\u3051\u3082\u89e3\u8aac"},"content":{"rendered":"\n<p>\u7686\u3055\u3093\u306f\u3001TypeScript\u3067\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u6d3b\u7528\u3057\u3066\u3044\u307e\u3059\u304b\uff1f<br>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u578b\u306e\u8a00\u8a9e\u3067\u306f\u7279\u306b\u91cd\u8981\u8996\u3055\u308c\u308b\u6a5f\u80fd\u3067\u3059\u304c\u3001\u4f7f\u3044\u65b9\u304c\u3088\u304f\u5206\u304b\u3089\u306a\u3044\u3068\u3044\u3063\u305f\u65b9\u3082\u4e2d\u306b\u306f\u3044\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u3053\u3067\u4eca\u56de\u306f\u3001TypeScript\u3067\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5\u3084\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u3001\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__1\" class=\"wp-block-heading\">TypeScript\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>JavaScript\u306b\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u76f8\u5f53\u3059\u308b\u69cb\u6587\u306f\u6b8b\u5ff5\u306a\u304c\u3089\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u304c\u3001TypeScript\u3067\u306f \u300cinterface\u300d \u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u3067\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u306f\u3001\u7279\u5b9a\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6301\u3064\u3079\u304d\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u305f\u578b\u306e\u3053\u3068\u3092\u8a00\u3044\u307e\u3059\u3002<br>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u69cb\u9020\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u30b3\u30fc\u30c9\u306e\u5b89\u5168\u6027\u3084\u4e88\u6e2c\u53ef\u80fd\u6027\u3092\u9ad8\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u4fbf\u5229\u306a\u6a5f\u80fd\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u4e3b\u306a\u5f79\u5272\u306f\u3001\u5b9f\u969b\u306b\u305d\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u30e1\u30bd\u30c3\u30c9\u304c\u3069\u306e\u3088\u3046\u306a\u51e6\u7406\u3092\u3059\u308b\u304b\u3001\u6216\u3044\u306f\u4f7f\u7528\u3055\u308c\u308b\u304b\u3068\u3044\u3063\u305f\u4e2d\u8eab\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u306f\u306a\u304f\u3001\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3059\u308b\u4e0a\u3067\u5fc5\u8981\u306a\u8981\u4ef6 (\u69cb\u9020) \u304c\u4f55\u3067\u3042\u308b\u304b\u3092\u793a\u3059\u3053\u3068\u306b\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u305f\u3081\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u5b9a\u7fa9\u3059\u308b\u306e\u306f\u30d7\u30ed\u30d1\u30c6\u30a3\u540d\u3084\u305d\u306e\u578b\u3001\u307e\u305f\u306f\u95a2\u6570\u540d\u3068\u5f15\u6570\u3084\u623b\u308a\u5024\u306e\u6709\u7121\u306a\u3069\u3060\u3051\u3067\u3042\u308a\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5024\u3084\u95a2\u6570\u306e\u51e6\u7406\u5185\u5bb9\u306a\u3069\u306f\u8a18\u8ff0\u3057\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u5b9a\u7fa9\u3057\u305f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001\u305d\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u6c42\u3081\u308b\u69cb\u9020\u306b\u5f93\u3063\u3066\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u30e1\u30bd\u30c3\u30c9\u3092\u4fdd\u6301\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<br>\u3053\u308c\u306b\u3088\u308a\u3001\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5fc5\u8981\u306a\u51e6\u7406\u304c\u6b63\u3057\u304f\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__2\" class=\"wp-block-heading\">interface\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<p>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9a\u7fa9\u65b9\u6cd5\u3084\u3001\u5177\u4f53\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001\u9806\u306b\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__2_1\" class=\"wp-block-heading\">\u57fa\u672c\u69cb\u6587<\/h3>\n\n\n\n<p>\u307e\u305a\u306f\u3001\u57fa\u672c\u69cb\u6587\u304b\u3089\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9a\u7fa9\u3059\u308b\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u69cb\u6587\u3067\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>interface \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u540d {\n  \u30d7\u30ed\u30d1\u30c6\u30a3\u540d1: \u578b;\n  \u30d7\u30ed\u30d1\u30c6\u30a3\u540d2: \u578b;\n  ...\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u4f8b\u3048\u3070\u6b21\u306e\u3088\u3046\u306b\u3001 \u300cStudent\u300d \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9a\u7fa9\u3057\u305f\u5834\u5408\u3001\u305d\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u306f\u3001 string\u578b\u306e\u30d7\u30ed\u30d1\u30c6\u30a3 \u300cname\u300d \u3068\u3001number\u578b\u306e\u30d7\u30ed\u30d1\u30c6\u30a3 \u300cage\u300d \u3092\u5fc5\u305a\u6240\u6301\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>interface Student {\n  name: string;\n  age: number;\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u307e\u305f\u3001\u4ee5\u4e0b\u306e\u4f8b\u306e\u3088\u3046\u306b\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u578b\u306b\u4ed6\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u6307\u5b9a\u3057\u3066\u3001\u30cd\u30b9\u30c8\u3055\u305b\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>interface Score {\n  english: number;\n  math: number;\n  science: number;\n}\n\ninterface Student {\n  name: string;\n  age: number;\n  score: Score;\n}<\/code><\/pre><\/div>\n\n\n\n<h3 id=\"outline__2_2\" class=\"wp-block-heading\">\u5b9a\u7fa9\u3057\u305finterface\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n\n\n\n<p>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9a\u7fa9\u304c\u5b8c\u4e86\u3057\u305f\u3089\u3001\u5b9f\u969b\u306b\u4f7f\u7528\u3057\u305f\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3084\u30af\u30e9\u30b9\u306b\u5b9f\u88c5\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f7f\u7528\u3057\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u578b\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>interface Student {\n  name: string;\n  age: number;\n}\n\nlet taro: Student = {\n  name: &quot;Taro Yamada&quot;,\n  age: 15\n};<\/code><\/pre><\/div>\n\n\n\n<p>\u30af\u30e9\u30b9\u306b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u5834\u5408\u306f\u3001\u300cimplements\u300d \u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>interface Human {\n  name: string;\n  age: number;\n  sayHello(): void;\n}\n \nclass Student implements Human {\n\n  name: string;\n  age: number;\n\n  constructor(name: string, age: number) {\n    this.name = name;\n    this.age = age;\n  }\n\n  sayHello() {\n    console.log(`\u3053\u3093\u306b\u3061\u306f\u3001\u79c1\u306e\u540d\u524d\u306f${this.name}\u3067\u3059\u3002\u5e74\u9f62\u306f${this.age}\u6b73\u3067\u3059\u3002`);\n  }\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f\u3001\u8907\u6570\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<br>\u305d\u306e\u5834\u5408\u306f \u300c,\u300d \u3067\u533a\u5207\u3063\u3066\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>interface Human {\n\tname: string;\n\tage: number;\n}\n\ninterface greet {\n\tsayHello(): void;\n}\n\nclass Student implements Human, Greet {\n\tname: string;\n\tage: number;\n\n\tconstructor(name: string, age: number) {\n\t\tthis.name = name;\n\t\tthis.age = age;\n\t}\n\n\tsayHello() {\n\t\tconsole.log(\n\t\t\t`\u3053\u3093\u306b\u3061\u306f\u3001\u79c1\u306e\u540d\u524d\u306f${this.name}\u3067\u3059\u3002\u5e74\u9f62\u306f${this.age}\u6b73\u3067\u3059\u3002`,\n\t\t);\n\t}\n}\n\nconst taro = new Student(&quot;\u592a\u90ce&quot;, 20);\n\ntaro.sayHello();<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>\u3053\u3093\u306b\u3061\u306f\u3001\u79c1\u306e\u540d\u524d\u306f\u592a\u90ce\u3067\u3059\u3002\u5e74\u9f62\u306f20\u6b73\u3067\u3059\u3002<\/code><\/pre><\/div>\n\n\n\n<p>\u3044\u305a\u308c\u3082\u3001\u6307\u5b9a\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u30e1\u30bd\u30c3\u30c9\u304c\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u3068\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__2_3\" class=\"wp-block-heading\">\u95a2\u6570\u578b\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u5ba3\u8a00\u3059\u308b<\/h3>\n\n\n\n<p>TypeScript\u3067\u306f\u3001\u95a2\u6570\u3092\u578b\u3068\u3057\u3066\u5b9a\u7fa9\u3059\u308b\u5834\u5408\u306b\u3082\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u95a2\u6570\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9a\u7fa9\u3059\u308b\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u69cb\u6587\u3067\u3001\u5f15\u6570\u3068\u623b\u308a\u5024\u306e\u578b\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>interface \u95a2\u6570\u540d {\n  (\u5f15\u65701: \u578b1, \u5f15\u65702: \u578b2, ...): \u623b\u308a\u5024\u306e\u578b;\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u95a2\u6570\u304c\u53d7\u3051\u53d6\u308b\u5f15\u6570\u3084\u623b\u308a\u5024\u306e\u578b\u306a\u3069\u3092\u53b3\u5bc6\u306b\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u9593\u9055\u3063\u305f\u578b\u306e\u30c7\u30fc\u30bf\u3092\u95a2\u6570\u306b\u6e21\u3059\u3053\u3068\u3092\u9632\u304e\u3001\u5b89\u5168\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u3001\u95a2\u6570\u304c\u3069\u306e\u3088\u3046\u306a\u5f15\u6570\u3092\u53d6\u308a\u3001\u3069\u306e\u3088\u3046\u306a\u5024\u3092\u8fd4\u3059\u304b\u3092\u660e\u793a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u305f\u3081\u3001\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u304c\u5411\u4e0a\u3059\u308b\u3068\u3044\u3046\u5229\u70b9\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306f\u3001\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>interface FunctionSayHello {\n  (name: string): string;\n}\n\ninterface FunctionSum {\n  (x: number, y: number): number;\n}\n\nconst sayHello: FunctionSayHello = function(name: string) {\n  return `\u3053\u3093\u306b\u3061\u306f\u3001\u79c1\u306e\u540d\u524d\u306f${name}\u3067\u3059\u3002`;\n};\n\nconst sum: FunctionSum = function(x: number, y: number) {\n  return x + y;\n};\n\nconsole.log(sayHello(&quot;\u5c71\u7530\u592a\u90ce&quot;));\nconsole.log(sum(2, 3));<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>\u3053\u3093\u306b\u3061\u306f\u3001\u79c1\u306e\u540d\u524d\u306f\u5c71\u7530\u592a\u90ce\u3067\u3059\u3002\n5<\/code><\/pre><\/div>\n\n\n\n<h3 id=\"outline__2_4\" class=\"wp-block-heading\">readonly\u3067\u8aad\u307f\u53d6\u308a\u5c02\u7528\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u5ba3\u8a00\u3059\u308b<\/h3>\n\n\n\n<p>TypeScript\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u306f\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u540d\u306e\u524d\u306b \u300creadonly\u300d \u4fee\u98fe\u5b50\u3092\u3064\u3051\u308b\u3053\u3068\u3067\u3001\u8aad\u307f\u53d6\u308a\u5c02\u7528\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u3057\u3066\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>interface Human {\n  readonly name: string;\n  age: number;\n}\n\nlet taro: Human = {\n  name: &quot;\u5c71\u7530\u592a\u90ce&quot;,\n  age: 15\n};\n\ntaro.name = &quot;\u7530\u4e2d\u592a\u90ce&quot;;\ntaro.age = 20;<\/code><\/pre><\/div>\n\n\n\n<p>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>error TS2540: Cannot assign to &#39;name&#39; because it is a read-only property.<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u3053\u306e\u3088\u3046\u306b\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<br>let\u3067\u5909\u6570\u3092\u5ba3\u8a00\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u672c\u6765\u3067\u3042\u308c\u3070\u5024\u306e\u4e0a\u66f8\u304d\u304c\u53ef\u80fd\u306a\u306e\u3067\u3059\u304c\u3001name\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u8aad\u307f\u53d6\u308a\u5c02\u7528\u306e\u305f\u3081\u4e0d\u5177\u5408\u304c\u8d77\u304d\u3066\u3044\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u4e00\u90e8\u306e\u5024\u306e\u307f\u3092\u4e0a\u66f8\u304d\u4e0d\u53ef\u3068\u3057\u305f\u3044\u5834\u5408\u306a\u3069\u306b\u4fbf\u5229\u306a\u6a5f\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__2_5\" class=\"wp-block-heading\">interface\u306e\u7d99\u627f\u3068\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9<\/h3>\n\n\n\n<p>interface\u306b\u4f3c\u305f\u6a5f\u80fd\u306b\u3001type\uff08\u578b\u30a8\u30a4\u30ea\u30a2\u30b9\uff09\u3068\u3044\u3046\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<br>\u57fa\u672c\u7684\u306a\u4ed5\u69d8\u304c\u4f3c\u3066\u3044\u308b\u3053\u306e\uff12\u3064\u3067\u3059\u304c\u3001\u7d99\u627f\u3084\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u306e\u70b9\u306b\u304a\u3044\u3066\u3001\u8a18\u8ff0\u65b9\u6cd5\u3084\u52d5\u4f5c\u304c\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305a\u306f\u3001\u305d\u308c\u305e\u308c\u306e\u7d99\u627f\u65b9\u6cd5\u304b\u3089\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<br>interface\u306e\u5834\u5408\u306f\u3001\u300cextends\u300d \u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u7d99\u627f\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>interface Job {\n  job: string;\n}\n\ninterface Human extends Job {\n  name: string;\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001\u300cJob\u300d \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u7d99\u627f\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u7d50\u679c\u3068\u3057\u3066 \u300cHuman\u300d \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f job \u3068 name \u306e\uff12\u3064\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u6301\u3064\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4e00\u65b9\u3001type\u3067\u306f\u7d99\u627f\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u304c\u3001\u4ee3\u308f\u308a\u306b\u4ea4\u5dee\u578b (&amp;) \u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u4f3c\u305f\u6a5f\u80fd\u3092\u5b9f\u73fe\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>type Job = {\n  job: string;\n};\n\ntype Human =  Job & {\n  name: string;\n};<\/code><\/pre><\/div>\n\n\n\n<p>interface\u3067\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3092\u884c\u3046\u5834\u5408\u306b\u3001\u4e92\u63db\u6027\u306e\u306a\u3044\u578b\u3092\u6307\u5b9a\u3059\u308b\u3068\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u4f8b\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>interface Human {\n  name: string;\n  age: number;\n}\n\ninterface Student extends Human {\n  name: number;\n  age: number;\n  class: number;\n}<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>error TS2430: Interface &#39;Student&#39; incorrectly extends interface &#39;Human&#39;.\n  Types of property &#39;name&#39; are incompatible.\n    Type &#39;number&#39; is not assignable to type &#39;string&#39;.<\/code><\/pre><\/div>\n\n\n\n<p>\u4e00\u65b9\u3001type\u306e\u5834\u5408\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u304c\u767a\u751f\u305b\u305a\u3001never\u578b\u3068\u3057\u3066\u51e6\u7406\u3055\u308c\u307e\u3059\u3002<br>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u306e\u30df\u30b9\u3092\u9632\u304e\u305f\u3044\u5834\u5408\u306f\u3001type\u3088\u308a\u3082 interface\u306e\u65b9\u304c\u4f7f\u7528\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u6b21\u306e\u9805\u76ee\u3067\u3082\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u304c\u3001TypeScript\u306e\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b declaration merging\u3068\u3044\u3046\u30c6\u30af\u30cb\u30c3\u30af\u306b\u3088\u308a\u3001interface\u3067\u306f\u540c\u540d\u3067\u306e\u5b9a\u7fa9\u3092\u8907\u6570\u884c\u3063\u305f\u5834\u5408\u306b\u5185\u5bb9\u304c\u30de\u30fc\u30b8\u3055\u308c\u308b\u3068\u3044\u3046\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u7279\u5fb4\u306f type\u306b\u306f\u7121\u3044\u6a5f\u80fd\u306e\u305f\u3081\u3001\u62e1\u5f35\u6027\u3092\u91cd\u8981\u8996\u3059\u308b\u5834\u5408\u3082 interface\u306e\u4f7f\u7528\u304c\u3088\u308a\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__3\" class=\"wp-block-heading\">interface\u306e\u5ba3\u8a00\u3092\u30de\u30fc\u30b8\u3059\u308b<\/h2>\n\n\n\n<p>\u5148\u307b\u3069\u3082\u89e3\u8aac\u3057\u305f\u3088\u3046\u306b\u3001interface\u306f \u300cDeclaration Merging\u300d \u3068\u3044\u3046\u30c6\u30af\u30cb\u30c3\u30af\u306b\u3088\u308a\u3001\u540c\u3058\u540d\u524d\u3067\u5ba3\u8a00\u3055\u308c\u305f2\u3064\u4ee5\u4e0a\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\uff11\u3064\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u3057\u3066\u7d71\u5408\uff08\u30de\u30fc\u30b8\uff09\u3059\u308b\u3068\u3044\u3046\u7279\u5fb4\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>interface Human {\n  name: string;\n}\n\ninterface Human {\n  age: number;\n}\n\nconst human: Human = {\n  name: &quot;\u5c71\u7530\u592a\u90ce&quot;   \n};<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>error TS2741: Property &#39;age&#39; is missing in type &#39;{ name: string; }&#39; but required in type &#39;Human&#39;.<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001human\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b age\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u3068\u3057\u3066\u3001\u30a8\u30e9\u30fc\u304c\u51fa\u3066\u3057\u307e\u3044\u307e\u3059\u3002<br>\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001\u5ba3\u8a00\u306e\u30de\u30fc\u30b8\u306b\u3088\u308a\u3001Human\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u6301\u3064\u30d7\u30ed\u30d1\u30c6\u30a3\u304c name \u3068 age \u306e\uff12\u3064\u3068\u306a\u3063\u305f\u305f\u3081\u306b\u767a\u751f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001interface\u3067\u540c\u540d\u3067\u306e\u5ba3\u8a00\u3092\u8907\u6570\u884c\u3046\u3068\u3001\u81ea\u52d5\u3067\u5185\u5bb9\u304c1\u3064\u306b\u7d71\u5408\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__4\" 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TypeScript\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u306f\uff1f JavaScript\u306b\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u76f8\u5f53\u3059 [&hellip;]","protected":false},"author":11,"featured_media":9724,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/ts_interface.webp","fifu_image_alt":"\u3010TypeScript\u5165\u9580\u3011interface\u3067\u578b\u5b9a\u7fa9\u3092\u4f5c\u6210\u3059\u308b\uff01Type\u3068\u306e\u9055\u3044\u30fb\u4f7f\u3044\u5206\u3051\u3082\u89e3\u8aac","footnotes":""},"categories":[15],"tags":[],"class_list":["post-9721","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programming"],"_links":{"self":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/9721","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/comments?post=9721"}],"version-history":[{"count":3,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/9721\/revisions"}],"predecessor-version":[{"id":9726,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/9721\/revisions\/9726"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/media\/9724"}],"wp:attachment":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/media?parent=9721"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/categories?post=9721"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/tags?post=9721"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}