Question

99

Join Array from startIndex to endIndex

rated 0 times [ 103] [ 4] / answers: 1 / hits: 42065 / 12 Years ago, thu, april 26, 2012, 12:00:00

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 :)

What I expect is something like

var array= ["a", "b", "c", "d"];

function Array.prototype.join(seperator [, startIndex, endIndex]){

  // code

}

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

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

Regards

globalworming

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uriahw

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2 Years ago

answered 12 Years ago dustin · Accepted Answer

It works native

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

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