對照名稱
重要性：5
您有一個 user 物件陣列，每個物件都有 user.name。請撰寫程式碼將其轉換成一個名稱陣列。
例如
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, Marylet 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