javascript 数组求交集/差集/并集/过滤重复

最近在小一个小程序项目,突然发现 javscript 对数组支持不是很好,连这些基本的功能,都还要自己封装.网上查了下,再结合自己的想法,封装了一下,代码如下.

//数组交集
Array.prototype.intersect  = function(){

    let mine = this.concat();
    for (var i = 0; i < arguments.length; i++) {
    
        mine.map(function (value, index) {
            if (!this.includes(value)) delete mine[index];
            
        }, arguments[i]);
    }
    
    return mine.filter(v => v);
};



//数组差集:返回在当前数组中,但不在其他数组中的元素
Array.prototype.minus = function(){

    let mine = this.concat();
    for (var i = 0; i < arguments.length; i++) {
   
        mine.map(function (value, index) {
            if (this.includes(value))  delete mine[index];
            
        }, arguments[i]);
    }
    return mine.filter(v => v);
};



//过滤数组重复元素
Array.prototype.unique = function(){

    let result = [];
     this.map(function (value, index) {
         if (!this.includes(value))   this.push(value);
     }, result);
    
    return result;
};


//数组并集
Array.prototype.union = function(){

    let result = this.concat();
    for (var i = 0; i < arguments.length; i++) {
    
        arguments[i].map(function (value, index) {
            if (!this.includes(value))   this.push(value);

        }, result);
    }
   return result;
};


[1, 2, 3, 2, 1].unique();
[1, 2, 3].intersect([1, 2, 8], [1, 2, 6], [1, 2, 3]);
[1, 2, 3].minus(["aaaa",  2], [  "cccc", 1]);
[1, 2, 3].union(["Robin", "aaaa", "bbbb"], ["aaaa", "cccc"]);