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"]);