JSFiddle - React, Tailwind, and code Playground

JavaScript

let arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13];
alert(chunks(arr, 3));

function chunks(arr, chunkSize) {
  var result = [];
  var index = 0;
  for (var i = 0; i < chunkSize; i++) {
    for (var j = 0; j < arr.length / chunkSize; j++) {
      if (arr[i + (chunkSize * j)] != null)
        result[index++] = arr[i + (chunkSize * j)];
    }
  }
  return result;
}