Method that chunks an array of n elements into sub-arrays of max y elements

chunk.js

const chunk = (array, num) => array.reduce((array, current) => {
  const last = array[array.length - 1];
  const init = array.slice(0, -1);
  if (!last) {
    return [...init, [current]]
  }
  if (last.length >= num) {
    return [...array, [current]]
  }
  return [...init, [...last, current]];
}, []);