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
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
Just slice the array you want out, then join it manually.
var array= ["a", "b", "c", "d"];
var joinedArray = array.slice(1, 3).join("-");
Note: slice()
doesn't include the last index specified, so (1, 3) is equivalent to (1, 2).
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