我如何检查一个数组是否有 2 个或更多相同的值，如果有则返回 false？

Question

我有一个像这样的数组：

[
{id:1,name:abc,age:12,primary:true}
{id:2,name:zyx,age:23,primary:true}
{id:3,name:hello,age:34, primary:false}
]

我这个数组我需要检查主要是否有超过 1 个 true 如果是返回 false 否则返回 true

Answer 1

您可以使用array.filter获取新的原色数组并检查该数组的length

 let arr = [ {id:1,name:'abc',age:12,primary:true}, {id:2,name:'zyx',age:23,primary:true}, {id:3,name:'hello',age:34, primary:false} ] let moreThanOnePrimary = arr.filter(x => x.primary).length >= 2; console.log(moreThanOnePrimary); let returnValue =;moreThanOnePrimary;