检查数组对象 Javascript 或 Angular 中是否存在值
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Check if value exists in Array object Javascript or Angular
提问by Stiven Castillo
I want to check if value exist in array object, example:
我想检查数组对象中是否存在值，例如：
I have this array:
我有这个数组：
[
{id: 1, name: 'foo'},
{id: 2, name: 'bar'},
{id: 3, name: 'test'}
]
And I want check if id = 2exist here.
我想检查id = 2这里是否存在。
Thanks
谢谢
回答by Karim
You can use Array.prototype.some
你可以使用Array.prototype.some
var a = [
{id: 1, name: 'foo'},
{id: 2, name: 'bar'},
{id: 3, name: 'test'}
];
var isPresent = a.some(function(el){ return el.id === 2});
console.log(isPresent);回答by Chang
You can use: some()
您可以使用：一些（）
If you want to just check whether a certain value exists or not, Array.some()method (since JavaScript 1.6)is fair enough as already mentioned.
如果你只想检查某个值是否存在，Array.some()方法（自 JavaScript 1.6 起）就已经足够了。
let a = [
{id: 1, name: 'foo'},
{id: 2, name: 'bar'},
{id: 3, name: 'test'}
];
let isPresent = a.some(function(el){ return el.id === 2});
console.log(isPresent);
Also, find()is a possible choice.
此外，find()是一个可能的选择。
If you want to fetch the entire very first object whose certain key has a specific value, better to use Array.find()method which has been introduced since ES6.
如果您想获取某个键具有特定值的整个第一个对象，最好使用Array.find()自 ES6 以来引入的方法。
let hasPresentOn = a.find(
function(el) {
return el.id === 2
}
);
console.log(hasPresentOn);
回答by sumeet kumar
You can use find method as below
您可以使用 find 方法如下
var x=[
{id: 1, name: 'foo'},
{id: 2, name: 'bar'},
{id: 3, name: 'test'}
]
var target=x.find(temp=>temp.id==2)
if(target)
console.log(target)
else
console.log("doesn't exists")回答by Fateh Mohamed
try this
试试这个
let idx = array.findIndex(elem => {
return elem.id === 2
})
if (idx !== -1){
//your element exist
}
