function permAlone(str) {
  var permutationList = function(str) {
    console.log("=== Start ===");
    var arr = str.split("");
    var arrLen = arr.length;
    console.log("arr = " + arr + " at length " + arrLen);
    var permutations = [];

    if(arrLen === 0) {
      console.log("=== End === " + " string returned!");
      return [str];
    }

    for(var i = 0; i < arr.length; i++) {
      var others = Object.create(arr);
      var item = others.splice(i, 1);
      console.log("others = " + others);
      console.log("item = " + item);
      var permutationOthers = permutationList(others.join(""));
      var permutationOthersLen = permutationOthers.length;
      console.log("permutationOthers = " + permutationOthers + " at length " + permutationOthersLen);
      for(var j = 0; j < permutationOthersLen; j++) {
        var next = item.concat(permutationOthers[j]);
        console.log("next = " + next);
        permutations.push(next.join(""));
        console.log("permutations = " + permutations);
      }
    }
    console.log("=== End ===");
    return permutations;
  };
  return permutationList(str).
    filter(function(item) {
    return !item.search(/(.)\1+/);
  }).
  length;
}
console.log(permAlone("abcdefa"));