Tagged collections

Split a list into consecutive batches of at most n items, in order; the last batch may be short.

Remove records that share a key value, keeping the first or the last of each, in input order.

Compare two lists of records by key: which were added, which removed, and which changed and in what fields.

Group records by the value at one key, preserving input order inside each group.

Slice a list into a 1-based page and report the totals an API response needs.

Filter records by a case-insensitive substring match across named fields, in input order.

Stably sort records by one key, ascending or descending, with a total order across mixed types.

Retry dates for a failed subscription payment from a retry policy, in calendar or business days.