Answers for "node processing lengthly for loop in chunck"

js split array into smaller arrays

Array.prototype.chunk = function(n) {
  if (!this.length) {
    return [];
  }
  return [this.slice(0, n)].concat(this.slice(n).chunk(n));
};
console.log([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15].chunk(5));

array chunk javascript

//#Source https://bit.ly/2neWfJ2 
const chunk = (arr, size) =>
  Array.from({ length: Math.ceil(arr.length / size) }, (v, i) =>
    arr.slice(i * size, i * size + size)
  );
console.log(chunk([1, 2, 3, 4, 5], 2));