js Set对象

1、将数组转换成Set对象

let arr1 = new Set([1,2,3,4])

console.log(arr1)  //{1,2,3,4}

2、数组去重

let arr2 = new Set([1,1,2,3,4])

let arr3 = [...arr2]

console.log(arr2, arr3) // {1,2,3,4} [1,2,3,4]

3、Set.prototype.has(value)判断该值是否存在于Set对象中，返回布尔值

let arr4 = new Set([1,2,3,4])

console.log(arr4.has(1)) // true

结合filter()方法，返回值为true的集合

let arr = [{id:1, name: 'aaa'}, {id: 2, name: 'bbb'}, {id:3, name: 'cccc'}, {id:4, name: 'dddd'}]

let arr1 = [1,2]

let newarr = arr.filter((item)=>{

    return new Set(arr1).has(item.id)

})

console.log(newarr)

//  [{id:1, name: 'aaa'}, {id:2, name: 'bbb'}]

巴特西

js Set对象

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