my solution for 'no repeats please' on fcc

permAlone.js

function permAlone(str) {
  if (str.length === 1) {
    return 1;
  }
  var factorial = fact(str.length);
  var permutations = computePermutations(str.split(''), factorial);
  
  var unique = permutations.filter(function (perm) {
    return !perm.match(/(.)\1{1,}/);
  });
  
  return unique.length;
}


function computePermutations(arr, factorial) {
  var length = arr.length;
  var temp;
  var perms = [];
  
  var i = 1;
  var j = 0;
  
  for (var count = 0; count < factorial;) {
    var current = arr;
    
    var k = 0;
    while (k != factorial/length) {
      while (i != length - 1) {
        perms.push(arr.join(''));
        
        temp = arr[i];
        arr[i] = arr[i + 1];
        arr[i + 1] = temp;
        
        k += 1;
        
        count += 1;
        
        i += 1;
      }
      
      i = 1;
    }
    
    j += 1;
    
    if (j === length) {
      break;
    }
    
    temp = arr[0];
    arr[0] = arr[j];
    arr[j] = temp;
  }
  
  return perms;
}


function fact(n) {
  if (n === 1) {
    return n;
  }
  
  return n * fact (n - 1);
}