檢查，如果在陣列字典對象包含在javascript

Question

一定值I有一個數組，像這樣：

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

我需要通過陣列環，並查看是否在陣列中的任何項具有一定的值。我已經查看了其他問題，並通過大多數循環和創建變量，但我不允許使用var（ES6的東西，我是js noob，我不知道，只是被告知永遠不會使用var，總是const）。基本上我需要這樣的事情：

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

我想函數返回true/false，而不是對象本身。

感謝

Answer 1

要檢查是否在數組中存在的對象，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()。

代碼：

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與和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'))