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  • new Set() 数组去重

    new Set(),用来去重数组。

    Set类似于数组,区别在于它所有的成员都是唯一的,不能有重复的值

    数值去重:

    let arr = [1, 2, 2, 3];  // [1, 2, 2, 3]

    let set = new Set(arr);  //去掉重复数据,返回结果是'set'
    let newArr = Array.from(set);  //将set转化为数组

    console.log(newArr); // [1, 2, 3]

    对象去重:

    const b={a:2}
    let arr = [{a:1}, b, b, {a:3}];  //[{a:1},{a:2},{a:2},{a:3}]
    let set = new Set(arr);
    let newArr = Array.from(set);
    console.log(newArr); // [{a:1},{a:2},{a:3}]

    无法对象去重:

    let arr = [{a:1}, {a:2}, {a:2}, {a:3}];  //[{a:1},{a:2},{a:2},{a:3}]
    let set = new Set(arr);
    let newArr = Array.from(set);
    console.log(newArr); //[{a:1},{a:2},{a:2},{a:3}]

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  • 原文地址:https://www.cnblogs.com/crdanding/p/12302214.html
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