Chunk a List

A packing machine fills boxes in order, size items per box, and the last box may be only partly full. Write chunk(items, size) that returns the boxes as a list of lists.

Every box except the last holds exactly size items, and the items keep their order. An empty list gives an empty list: no boxes at all.

Examples

chunk([1, 2, 3, 4, 5], 2)                 # returns [[1, 2], [3, 4], [5]]
chunk(['a', 'b', 'c', 'd', 'e', 'f'], 3)  # returns [['a', 'b', 'c'], ['d', 'e', 'f']]
chunk([1, 2], 5)                          # returns [[1, 2]]

Note

size is always at least 1.