noRepeatsPlease.js

var perms = [];

function permAlone(str) {
     var strArr = str.split("");
     //console.log(strArr);
     // empty the answer array each time this function is called
     perms = [];
     permutator(strArr.length, strArr);
     console.log(str + " - num perms: " + perms.length);
     // console.log(perms.join(", "));
     perms = removeDuplicates();
     console.log(perms.length);
     return perms.length;
}

function removeDuplicates() {
     var removeCounter = 0;
     var regEx = /(.)\1{1}/;

     var finalPerms = perms.filter(function (element, index, array) {
          if (element.search(regEx) !== -1) {
               console.log("removing: " + element);
               removeCounter++;
               return false;
          }
          return true;
     });
     console.log("Removed: " + removeCounter);
     return finalPerms;
}

/**
 * permutator
 *
 * @param {any} arr - an array of characters to be permutated
 * @return perms - an array of permutated strings
 */
function permutator(n, array) {

     if (n === 1) {
          perms.push(array.join(""));
          return array;
     }
     else {
          for (var i = 0; i < n - 1; i++) {
               permutator(n - 1, array);
               var temp;
               if (i % 2 === 0) {
                    temp = array[i];
                    array[i] = array[n - 1];
                    array[n - 1] = temp;

               }
               else {
                    temp = array[0];
                    array[0] = array[n - 1];
                    array[n - 1] = temp;
               }
          }
          // console.log(array.toString());
          permutator(n - 1, array);
     }

     //return perms;
}