ArrayUtils.partition will split arrays into fixed-size chunks. ListUtils.partition can’t be used directly on arrays, and converting arrays to lists adds overheads, especially for primitives. This utility will work directly on arrays and simplify common tasks.
For example, I once had to split a large byte[] into equal-sized chunks and realized I wished a ready-made method existed. ArrayUtils.partition will be definitely useful for byte arrays for now. I’m not sure about other array types yet. Kushal On Sat, 6 Sept, 2025, 2:44 am sebb, <[email protected]> wrote: > On Fri, 5 Sept 2025 at 18:46, Kushal Dixit <[email protected]> wrote: > > > > Hi All, > > > > I’d like to propose adding a small utility to ArrayUtils for partitioning > > arrays into fixed-size chunks. > > > > Currently, ListUtils.partition exists for lists, but there is no direct > > equivalent for arrays in Commons Lang. Developers often write custom > loops > > to achieve the same result. > > > > Proposed API example: > > > > int[][] result = ArrayUtils.partition(new int[]{1, 2, 3, 4, 5}, 2); > > // → [[1, 2], [3, 4], [5]] > > > > Key points: > > > > Supports primitive and object arrays. > > > > Null-safe (returns empty array of arrays if input is null). > > > > Consistent with ListUtils.partition behavior. > > > > Small, general-purpose utility aligned with Lang’s focus on array > helpers. > > > > > > I’d like to check whether the community thinks this addition fits Lang’s > > scope before opening a JIRA/PR. > > What use cases are there for this? > > > Thanks, > > Kushal > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > >
