javascript - Better way to turn a one-dimensional array into multi-dimensional array by required group size in JS -

i rather new js , working on problem asked split array (first argument) groups length of size (second argument) , returns them multidimensional array. got problem work right test cases suggested using array `push()` method. tried multiple times , couldn't ever work right. think getting messed arrays being reference. declared new array each element. went more classic deep copy each element @ time. didn't go , try `push()` method again. there has more efficient way this. want write code. love see better versions please. thanks!

function chunk(arr, size) {      var group = 0;     var counter = 0;     var = false;     var odd = false;      if (arr.length % size === 0) {         group = arr.length / size;         = true;     } else {         group = math.ceil(arr.length / size);         odd = true;     }      var newarr = new array(group);      (var = 0; < group; i++) {         newarr[i] = new array(size);     }      (i = 0; < group; i++) {         (var j = 0; j < size && counter < arr.length; j++) {             newarr[i][j] = arr[counter++];         }      }      return newarr; }  chunk(['a', 'b', 'c', 'd'], 2); 

using array.prototype.slice, function can written in shorter way:

function chunk(array, size) {   var result = []   (var i=0;i<array.length;i+=size)     result.push( array.slice(i,i+size) )   return result   }