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GeezerVison is showing ja.javascript.info — 名前へのマップ

名前へのマップ

重要性: 5

user オブジェクトの配列を持っているとします。それは user.name を持っています。それは名前の配列に変換するコードを書いてください。

例:

let john = { name: "John", age: 25 };
let pete = { name: "Pete", age: 30 };
let mary = { name: "Mary", age: 28 };

let users = [ john, pete, mary ];

let names = /* ... your code */

alert( names ); // John, Pete, Mary

let john = { name: "John", age: 25 };
let pete = { name: "Pete", age: 30 };
let mary = { name: "Mary", age: 28 };

let users = [ john, pete, mary ];

let names = users.map(item => item.name);

alert( names ); // John, Pete, Mary

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