Gives back the anagram of the string thats being passed in eg. anag("abc") Result: [ 'cab', 'bca', 'abc', 'cba', 'acb', 'bac' ]

anag.js

/* NEED TO PERFORMANCE TUNE */

function anag(str){
  'use strict';

	if(typeof str !== 'string'){
		return ;
	}

  str = str.replace(/\s+/g, '').toLowerCase();

  console.log(str);

	var splitStr = str.split(""),
      strLength = splitStr.length,
      permLengthfunc = function(len){
          var prem = 1;

          for(var i=len; i >= 1; i--){
            (i===len)?prem = prem * len:prem = prem * i;
          }

          return prem;
      },
      permLength = permLengthfunc(strLength),
      finalPerm = [];

      console.log(permLength);
      // finalPerm.push(str);
      // finalPerm.push(splitStr.reverse().join(""));


      var set1 =[],
          set2 = [],
          halflength = permLength/2;


      function looper(strSplit, set){
          for (var i = 0; i < halflength; i++) {

            if (typeof set !== 'undefined' && set.length > 0) {
              var setLastArr = set[(set.length-1)].split("");
              // console.log(setLastArr);
              var set1Last = setLastArr.pop();
              setLastArr.unshift(set1Last)
              set.push(setLastArr.join(""));
            }else{
              var orgArr = splitStr;
              var setLast = orgArr.pop();
              // console.log(setLast);
              // console.log(orgArr);
              orgArr.unshift(setLast);
              set.push(orgArr.join(""));
            }
          };
      }

      looper(splitStr, set1);
      looper(splitStr.reverse(), set2);



	// console.log(set1);
 //  console.log(set2);

  finalPerm = set1.concat(set2);

   return finalPerm;


}

console.log(anag("Github"));