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  • 数组去重--ES5和ES6

    思路:把去重后的数组放到一个空数组中

    ES5实现:

    function uni(arr) {
        var result = [];
        for (var i=0;i<arr.length;i++) {
            if(result.indexOf(arr[i])==-1) {
                result.push(arr[i]);
            }
        }
        return result;
    }
    var obj = new uni([1,1,1,1,3,4,5]);
    console.log(obj);

    ES6实现:

    function removal(arr) {
        return Array.from(new Set(arr));
    }
    var obj = new removal([1,2,3,3,3,3,8,6,4,3]);
    console.log(obj);

    在此基础上,要求合并数组并去重也很简单了

    Es5:

    let arr1 = [1,2,3,4]
    let arr2 = [3,4,5,6]
    function uni(arr1,arr2) {
        var arr3 = arr1.concat(arr2)
        var arr4 = []
        var len = arr3.length
        for(var i=0;i<len;i++) {
            if (arr4.indexOf(arr3[i]) === -1) {
                arr4.push(arr3[i])
            }
        }return arr4
    }
    console.log(uni(arr1,arr2))

    Es6:

    let arr1 = [1,2,3,4]
    let arr2 = [3,4,5,6]
    function uni(arr1,arr2){
        arr1.push(...arr2)
        let arr3 = Array.from(new Set(arr1))
        console.log(arr3)
    }
    uni(arr1,arr2)
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  • 原文地址:https://www.cnblogs.com/sarah-wen/p/10742401.html
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