Splitting an array up into chunks of a given size [duplicate]

Answer 1

You misunderstood what the slice parameters mean. The second one is the index until which (not included) you want to get the subarray. It's not a length.

array.slice(from, to); // not array.slice(from, length)

function chunkArrayInGroups(arr, size) {
  var myArray = [];
  for(var i = 0; i < arr.length; i += size) {
    myArray.push(arr.slice(i, i+size));
  }
  return myArray;
}
console.log(chunkArrayInGroups(["a", "b", "c", "d"], 2));