My shitty attempt at a recursive permutation algorithm.

permute.js

function permute(set, digits, prefix){
  if(!prefix) prefix = ''; 

  if(--digits){
    var i = set.length;
    while(i--){
      permute(set, digits, prefix + set[i])
    }   
  }
  else{
    var i = set.length;
    while(i--){
      permCount++;
      console.log(prefix + set[i]);
    }   
  }
}