Chunk an array

Write chunk(arr, size) that splits arr into groups of size items. The last group holds whatever is left over.

chunk([1, 2, 3, 4], 2) → [[1, 2], [3, 4]]
chunk([1, 2, 3, 4, 5], 2) → [[1, 2], [3, 4], [5]]
chunk([1, 2, 3], 10) → [[1, 2, 3]]
chunk([1, 2, 3], 0) → []

Return [] for an empty array or when size is less than 1, and leave the input array untouched.

Define chunk in the editor. 7 tests will call it.

one clean solution

function chunk(arr, size) {
  if (!(size >= 1)) return []; // also covers NaN and undefined
  const result = [];
  for (let i = 0; i < arr.length; i += size) {
    result.push(arr.slice(i, i + size));
  }
  return result;
}

solution.js

function chunk(arr, size) {
  // Split arr into arrays of `size` items each.
  // The last chunk may be shorter. Return [] if size < 1.
}

Tests`⌘/Ctrl` + `Enter` to run

splits an array into equal chunks

puts the remainder in the last chunk

returns a single chunk when size is larger than the array

size 1 wraps every item

returns [] for an empty array

returns [] when size is less than 1

does not mutate the input

Chunk an array

Tests⌘/Ctrl + Enter to run

Tests`⌘/Ctrl` + `Enter` to run