30-seconds-of-code/snippets/chunk-array.md

Chunk array

Use Array.apply() to create a new array, that fits the number of chunks that will be produced. Use Array.map() to map each element of the new array to a chunk the length of size. If the original array can't be split evenly, the final chunk will contain the remaining elements.

const chunk = (arr, size) =>
  Array.apply(null, {length: Math.ceil(arr.length/size)}).map((v, i) => arr.slice(i*size, i*size+size));
// chunk([1,2,3,4,5], 2) -> [[1,2],[3,4],5]