pythonOff-by-oneHard

Data batcher missing the final records

Time: 0:00

What it should do

chunk(items, size) should split a list into groups of size, keeping any short final group. chunk([1,2,3,4,5], 2) gives [[1,2],[3,4],[5]].

What goes wrong

chunk([1,2,3,4,5], 2) returns [[1,2],[3,4]] — the final [5] is missing entirely.

Hints

This is an off-by-one errors bug

The loop that runs one time too many, the slice that drops the last item, the index that starts in the wrong place.