Chunk Array

Instructions:

• Given an array and chunk size, divide the array into many subarrays where each subarray is of length size

Examples:

• 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, 4, 5, 6, 7, 8], 3) --> [[ 1, 2, 3], [4, 5, 6], [7, 8]]
• chunk([1, 2, 3, 4, 5], 4) --> [[ 1, 2, 3, 4], [5]]
• chunk([1, 2, 3, 4, 5], 10) --> [[ 1, 2, 3, 4, 5]]

Repl.it:

• chunk-array

Code:

// First (🍌)
function chunk(array, size) {
  const chunked = [];
  for (element of array) {
    const last = chunked[chunked.length - 1];
    if (!last || last.length === size) {
      chunked.push([element]);
    } else {
      last.push(element);
    }
  }
  return chunked;
}
// Second (🍉)
function chunk(array, size) {
  const chunked = [];
  let index = 0;
  while (index < array.length) {
    chunked.push(array.slice(index, index + size));
    index += size;
  }
  return chunked;
}