TypeScript2.1.4 ã§å°Žå…¥ã•ã‚ŒãŸ `keyof` ã‚ーワード㨠`in` ã‚ーワードã€ãã—㦠Lookup Types 㨠Mapped Types - 角待ã¡ã¯å¯¾ç©ºkeyof ã‚ーワード key ã¨ã‚ªãƒ–ジェクトをå—ã‘å–りプãƒãƒ‘ティã®å€¤ã‚’å–り出ã™é–¢æ•°ã‚’考ãˆã¾ã™ã€‚ function getProp(obj: {}, key: string) { return obj[key]; } ã“ã®é–¢æ•°ä½¿ã£ã¦å¤‰æ•°ã‚’宣言ã™ã‚‹ã¨åž‹æŽ¨è«–ã§ã¯è¿”り値㯠any ã«ãªã£ã¦ã—ã¾ã„ã¾ã™ã€‚ const urara = { age: 15, name: "chiya", }; const a = getProp(urara, 'age'); // any const n = getProp(urara, 'name'); // any ã‚‚ã†ã¡ã‚‡ã„é ‘å¼µã£ã¦åž‹ä»˜ã‘ã—ãŸã„ã¨æ€ã£ãŸã‚‰ obj ã®åž‹ã‚’絞るã—ã‹ãªã•ãã†ã§ã™ã€‚ interface Urara { age: number; name: string; } ã§ã¯ key ã®åž‹ã¯ï¼Ÿã¨ãªã‚‹ã¨ä»Šã¾ã§ã¯ç´ 朴㫠String Literal ty
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