Question

我想在数组中搜索特定值。例如，我有一组用户，我想检查该数组中是否存在特定用户。

我的数组如下：

Array(5)
0:{id: "empty", name: "Choose one..."}
1:{id: "option_1", name: "shilpa"}
2:{id: "option_2", name: "anita"}
3:{id: "option_3", name: "admin"}
4:{id: "option_4", name: "user"}
length:5
__proto__:Array(0)

这里我想检查用户“admin”是否存在于数组中？

我尝试了以下但是它将结果返回为false：

console.log(this.observedByProperties.includes('admin'));

任何人都能提供解决方案吗？

Answer 1

您可以使用array#some来迭代数组，使用string#includes检查单词中是否存在admin。

＆＃13;

const arr = [{id: "empty", name: "Choose one..."}, {id: "option_1", name: "shilpa"},{id: "option_2", name: "anita"},{id: "option_3", name: "admin"},{id: "option_4", name: "user"}],
  exist = arr.some(({name}) => name.includes('admin'));
console.log(exist);

＆＃13;

Answer 2

您需要使用Array.find来检查具有特定值的对象是否存在，

\x61

Answer 3

这是一个generalized function，array和value为parameters并返回true或false

const arr = [{id: "option_1", name: "shilpa"},{id: "option_2", name: "anita"},{id: "option_3", name: "admin"},{id: "option_4", name: "user"}]

function containsValue(arr, x) {
    return arr.filter(function(elem) { return elem.name == x }).length > 0;
}
console.log(containsValue(arr, 'admin'))

Answer 4

你可以使用数组的过滤函数。

    let arr = [{id: "empty", name: "Choose one..."}, {id: "option_1", name: "shilpa"},{id: "option_2", name: "anita"},{id: "option_3", name: "admin"},{id: "option_4", name: "user"}];
this.findUser(arr,"Admin");

findUser(array, userName) {
    return array.filter(user => user.name === userName);
}

如何检查数组中是否存在值？

4 个答案: