JavaScript basic algorithm

function chunkArrayInGroups(arr, size) {
  if (arr.length <= size) {
    return [arr];
  } else {
    return [arr.slice(0, size)].concat(
      chunkArrayInGroups(arr.slice(size), size)

From what I understand about slice, it takes two arguments which are start and end but the end is not included. So in the above line of code, size was an end argument for the first slice which I think will end up giving one less element than the required size considering the index pattern of array. How was this reconciled please

Secondly, Is there a difference between the two sizes (first and second argument) in the last line of code

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Thank you.

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