javascript - Angular2 从对象数组中获取值

Question

如何从这个数组中获取值？我想从每个 Object 值中获取 firstPersonName。

我是这样写的

var rest = email.map(a => {
    a.firstPersonEmail;
});
console.log(rest);

但是我得到了

感谢您的帮助:)

Answer 1

这可能对您有帮助:

var rest = email.map(a => {
  return a.firstPersonEmail;
});
console.log(rest);

或

var rest = email.map(a => a.firstPersonEmail);
console.log(rest);

const email = [
  {id:1, firstPersonEmail: "John@mail.mail"},
  {id:2, firstPersonEmail: "John2@mail.mail"},
  {id:3, firstPersonEmail: "John3@mail.mail"}
];

const emptyEmail = [];

console.log(`Email length: ${email.length}`);
console.log(`Empty Email length: ${emptyEmail.length}`);

const rest = email.map(a => a.firstPersonEmail);
const emptyRest = emptyEmail.map(a => a.firstPersonEmail);

console.log(rest);
console.log(emptyRest);