get all combinations for a string

Question

I\'m trying to create a function in JavaScript that given a string will return an array of all possible combinations of the letters with each used at most once, starting wit

Answer 1

This is what I ended up using.

var combinations = function (string)
{
    var result = [];

    var loop = function (start,depth,prefix)
    {
        for(var i=start; i 0)
                loop(i+1,depth-1,next);
            else
                result.push(next);
        }
    }

    for(var i=0; i