检查，如果在阵列字典对象包含在javascript

Question

一定值I有一个数组，像这样：

const myArray = [{key1: "value1", key2: "value2"}, {key1: "value4", key2: "value8"}, 
    {key1: "value1", key2: "value3"}, {key1: "value1", key2: "value32"}] 

我需要通过阵列环，并查看是否在阵列中的任何项具有一定的值。我已经查看了其他问题，并通过大多数循环和创建变量，但我不允许使用var（ES6的东西，我是js noob，我不知道，只是被告知永远不会使用var，总是const）。基本上我需要这样的事情：

if (myArray.contains(object where key1=="value2")) { 
    // do something 
} 

我想函数返回true/false，而不是对象本身。

感谢

Answer 1

要检查是否在数组中存在的对象，你可以使用some()返回true/false

const myArray = [{key1: "value1", key2: "value2"}, {key1: "value4", key2: "value8"}, {key1: "value1", key2: "value3"}, {key1: "value1", key2: "value32"}] 
 
    
 
if(myArray.some(e => e.key1 == 'value1')) { 
 
    console.log('Exists'); 
 
}

Answer 2

您可以使用Array.prototype.some()。

代码：

const myArray = [{key1: "value1", key2: "value2"}, {key1: "value4", key2: "value8"}, {key1: "value1", key2: "value3"}, {key1: "value1", key2: "value32"}]; 
 

 
let isKey1Value2 = myArray.some((elem) => 'value2' === elem.key1); 
 

 
console.log(isKey1Value2);

Answer 3

Array#map与和includes()

const myArray = [{key1: "value1", key2: "value2"}, {key1: "value4", key2: "value8"}, {key1: "value1", key2: "value3"}, {key1: "value1", key2: "value32"}] 
 
console.log(myArray.map(a=>a.key1).includes('value2'))