Coding Challenge - #12: Chunk An Array

programming web dev
1

Write a function chunk(arr, size) that splits an array into smaller sub-arrays of a specified length. For example, chunk([1, 2, 3, 4, 5], 2) should return [[1, 2], [3, 4], [5]].

function chunk(arr, size) {
  // Your code here
}

Rules:

  • Must return a new array of chunked arrays.
  • The final chunk can contain fewer elements if the input array cannot be divided evenly.
  • Do not use any external libraries.

Post your solution as a reply. Answer goes up in about a day.

2

A simple approach is to step through the array by the chunk size and use slice():

function chunk(arr, size) {
  const result = [];

  for (let i = 0; i < arr.length; i += size) {
    result.push(arr.slice(i, i + size));
  }

  return result;
}

For example:

chunk([1, 2, 3, 4, 5], 2);
// [[1, 2], [3, 4], [5]]

This keeps the original array unchanged and naturally handles the final smaller chunk.

3

nice, slicing is definitely a good way to approach this. we’ll see how close that gets you later today!