Javascript recursion not functioning as expected -

i ported method java javascript. "original" array 9 objects in it, java code made 3000 subarrays of size 4.

in javascript code 6 subarrays of size 9.

var hitterarray = new array();  function permute(level, permuted, used, original){      if (level == 4) {         hitterarray.push(permuted); //array of arrays     } else {         (i = 0; < original.length; i++) {             if (!used[i]) {                 used[i] = true;                  permuted.push(original[i]);                  permute(level + 1, permuted, used, original);                  used[i] = false;             }         }     } } 

i want 3000 subarrays of size 4, why not working?

this how initialize permute function:

            var used = new array(results.length);             for(p = 0; p < used.length; p++){                 used[p] = false;             }             var permutearray = new array();              permute(0, permutearray, used, results); 

insight appreciated

i think error on loop, need declare i var otherwise make global variable.

for(var = 0; .... 

another thing might have impact passing references arrays: used , permuted have impact on result, consider cloning arrays array.slice() create new copies of them.

and think permutations of 4 objects out of 9 should 3024 (9*8*7*6), should 3024 arrays of 4

edit

function permute(level, permuted, used, original){      if (level == 4) {         hitterarray.push(permuted); //you don't need create copy here, if performance not issue, might want it, clarity     } else {         (var = 0; < original.length; i++) {             if (!used[i]) {                 var newused = used.slice();                 var newpermuted = permuted.slice();                  newused[i] = true;                  newpermuted.push(original[i]);                  permute(level + 1, newpermuted, newused, original);                  //used[i] = false; //this won't needed you've created copy of original 1             }         }     } }