Calculate permutations

permut.js

var permut = function (array, count, initial, output) {
  if (initial.length >= count) {
    output.push(initial);
  } else {
    for (var i = 0; i < array.length; ++i) {
      permut(array, count, initial.concat(array[i]), output);
    }
  }
};

var getPermutations = function (array, count) {
  var output = [];
  permut(array, count, [], output);
  return output;
};

var PART_VALUES = [0, 1, 2, 3, 4]; // 0 = Rabbit, 1 = Deer, etc
var PART_COUNT = 5; // Number of "slots", head, eyes, feet, etc

var perms = getPermutations(PART_VALUES, PART_COUNT);

console.log(perms.length + " permutations");