将从startIndex加入阵列ENDINDEX到 [英] Join Array from startIndex to endIndex

问题描述

我想问问是否有某种效用函数它提供阵列连接，同时提供一个指标。也许jQuery的原型提供了这一点，如果没有，我会写我自己：）

I wanted to ask if there is some kind of utility function which offers array joining while providing an index. Maybe Prototype of jQuery provides this, if not, I will write it on my own :)

我希望是像

var array= ["a", "b", "c", "d"];
function Array.prototype.join(seperator [, startIndex, endIndex]){
  // code
}

让array.join（ - ，1，2）将返回B-C

so that array.join("-", 1, 2) would return "b-c"

有没有这样的效用函数在pretty常见的JavaScript库？

Is there this kind of utility function in an pretty common Javascript Library?

问候
Wormi

Regards Wormi

推荐答案

它的工作原理本地

["a", "b", "c", "d"].slice(1,3).join("-") //b-c

如果你想让它表现得像你的定义，你可以用这种方式：

If you want it to behave like your definition you could use it that way:

Array.prototype.myJoin = function(seperator,start,end){
    if(!start) start = 0;
    if(!end) end = this.length - 1;
    end++;
    return this.slice(start,end).join(seperator);
};

var arr = ["a", "b", "c", "d"];
arr.myJoin("-",2,3)  //c-d
arr.myJoin("-") //a-b-c-d
arr.myJoin("-",1) //b-c-d

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