如何从内部有对象的数组中获取键值

Question

假设我有这样的东西：

const myArray = [
    {
        Email:example@example.com,
        Password:1234,
        Username:myname
    }
]

如何以更简单的方式访问对象内部的电子邮件值？我知道可以做一些循环或映射然后使用 for of 或类似的东西但有没有更好的方法？

我想做这样的检查：

const otherArray = [
    {
        Email:example@notexample.com,
        Username:myname,
        Password:1234
    }
]

如果 myArray 中的 Email 值等于 otherArray 的值，则：

return true

Answer 1

一些示例（语法错误已修复在值上）

let myname = "I create sntax errors";
const myArray = [{
  Email: "example@example.com",
  Password: "1234",
  Username: myname
}];

const otherArray = [{
  Email: "example@notexample.com",
  Username: myname,
  Password: "1234"
}];

const otherArrayAlso = [{
  Email: "example@example.com",
  Username: myname,
  Password: "1234"
}];
let isMatch = myArray[0].Email == otherArray[0].Email;
console.log(myArray[0].Email, otherArray[0].Email);
console.log("IsMatch:", isMatch);
console.log(myArray[0].Email == otherArrayAlso[0].Email);

Answer 2

您可以通过 myArray[0].Email 获取电子邮件。但首先将您的数组更改为

const myArray = [
    {
        'Email': 'example@example.com',
        'Password': 1234,
        'Username': 'myname'
    }
]

Answer 3

您可以像这样简单地检查

const myArray = [
  {
    Email: 'test@test.com',
    Age: 30,
  },
  {
    Email: 'One@test.com',
    Age: 24,
  },
  {
    Email: 'Two@test.com',
    Age: 20,
  },
]

const otherArray = [
  {
    Email: 'Three@test.com',
    Age: 30,
  },
  {
    Email: 'test@test.com',
    Age: 24,
  },
  {
    Email: 'Four@test.com',
    Age: 20,
  },
]

let found = false;

const otherArrayEmails = otherArray.map(item => item.Email);
for (let i = 0; i < myArray.length; i++) {
   if (otherArrayEmails.includes(myArray[i].Email)) {
      found = true;
      break;
   }
} 
console.log(found)

Answer 4

你可以使用Array.some()方法。

工作演示：

const myArray = [
    {
        Email: 'example@example.com',
        Username: 'myname',
        Password: 1234
    }, {
        Email: 'example1@example.com',
        Username: 'myname1',
        Password: 5678
    }, {
        Email: 'example2@example.com',
        Username: 'myname2',
        Password: 8756
    }
];

const otherArray = [
    {
        Email: 'example@notexample.com',
        Password: 1234,
        Username: 'myname'
    }
];

const res = myArray.some(obj => obj.Email === otherArray[0].Email);

console.log(res); // false as example@example.com is not equal to example@notexample.com.

如何从内部有对象的数组中获取键值

How can I get a key value from an array that has object inside

javascript

arrays

javascript-objects