chunk<T> function

List<List<T>> chunk<T>(List<T> list, [ int size = 1 ])

Creates an List of elements split into groups the length of size. If List can't be split evenly, the final chunk will be the remaining elements.

• @param {List} list The array to process.
• @param {Int} size The length of each chunk
• @returns {List} Returns the new List of chunks.

@example

chunk(['a', 'b', 'c', 'd'], 2)
// => [['a', 'b'], ['c', 'd']]

chunk(['a', 'b', 'c', 'd'], 3)
// => [['a', 'b', 'c'], ['d']]

Implementation

List<List<T>> chunk<T>(List<T> list, [int size = 1]) {
  size = size.clamp(0, list.length);
  final length = list.length;
  if (length == 0 || size < 1) {
    return [];
  }
  int index = 0;
  int resIndex = 0;
  final result = List<List<T>>.filled((length / size).ceil(), []);

  while (index < length) {
    result[resIndex++] = slice(list, index, (index += size));
  }
  return result;
}