subListint

SubListInt is a programming utility that returns a contiguous portion of a list of integers. It takes a list (or array) of integers and two indices, usually named fromIndex and toIndex, and yields the elements from fromIndex inclusive up to toIndex exclusive.

In typical implementations, the operation adheres to 0-based indexing. The resulting sublist contains elements at positions from fromIndex to toIndex-1. Implementations commonly enforce bounds: 0 <= fromIndex <= toIndex <= list length; violations raise an error or exception. If fromIndex equals toIndex, the result is an empty list. The exact handling of edge cases and negative indices depends on the language or library.

SubListInt may be implemented in two main ways. Some languages return a view into the original list, meaning the sublist and the source share memory and changes to elements reflect in both. Others return a new list that contains copies of the elements, so the sublist is independent of the original. Time and space performance differ accordingly: creating a view is typically O(1) in time and O(1) in additional space, while copying to a new list is O(n) time and O(n) space, where n is the length of the sublist.

Common usage includes extracting segments for processing, partitioning data, or creating windows over a sequence. Similar concepts exist in various languages under different names, such as slicing in Python, GetRange in some libraries, or List.subList in Java.

Example: subListInt([3, 5, 7, 9, 11], 1, 3) yields [5, 7].