Question

我有以下数组

// Exmaple
[
   ['morning', 'afternoon'],
   ['morning'],
   ['morning', 'afternoon'],
   ['morning', 'afternoon'],
   ['morning']
]

我可能有一个相同的人，但是每个阵列都有下午。我需要检查所有数组中是否存在给定值，例如，如果我检查'morning'，它应该返回true，但是如果我检查'Afternoon'< / strong>，它应该返回false，因为在上面的示例数组中，并非所有人都有'Afternoon'

Answer 1

  array.every(day => day.includes("morning")) // true

Answer 2

您可以使用.every()和.includes()方法：

let data = [
   ['morning', 'afternoon'],
   ['morning'],
   ['morning', 'afternoon'],
   ['morning', 'afternoon'],
   ['morning']
];

let checker = (arr, str) => arr.every(a => a.includes(str));

console.log(checker(data, 'morning'));
console.log(checker(data, 'afternoon'));

Answer 3

您可以使用Array.every和Array.includes

let arr = [['morning', 'afternoon'],['morning'],['morning', 'afternoon'],['morning', 'afternoon'],['morning']];

console.log(arr.every(v => v.includes('morning'))); // true
console.log(arr.every(v => v.includes('afternoon'))); // false

Answer 4

use .every()

 array.every(d => d.includes("morning")) // true
 array.every(d => d.includes("afternoon")) //false

Answer 5

您可以使用Array.prototype.every()并将Array.prototype.find()的结果强制转换为boolean，该结果返回满足提供的测试功能的数组中第一个元素的值。否则返回undefined。

代码：

const data = [['morning', 'afternoon'],['morning'],['morning', 'afternoon'],['morning','afternoon'],['morning']];
const checker = (arr, str) => arr.every(a => !!a.find(a => str === a));

console.log(checker(data, 'morning'));
console.log(checker(data, 'afternoon'));

JavaScript：检查所有数组是否包含相同的值？

5 个答案: