Skip to content

mergeIntervalsTime

mergeIntervalsTime(intervals: { start: string; end: string; }[]): { start: string; end: string; }[]
import { mergeIntervalsTime } from "@northguild/gmt/plain/interval";

Collapse a list of time intervals into the minimum set of non-overlapping intervals.

  • List-form generalization of intervalUnionTime, which is pairwise only.
  • Intervals are merged when they overlap or share an endpoint exactly (adjacent intervals ARE merged).
  • Order of the input list does not matter; the result is sorted by start.
  • Returns [] for an empty list.
  • Returns [] when intervals is not an array, when any element is not a { start, end } record of valid ISO PlainTime strings, or when any element has start > end.
Parameter Type Description
intervals { start: string; end: string; }[] array of { start, end } records

the minimum set of non-overlapping { start, end } records, sorted by start, or [] on invalid input

mergeIntervalsTime([{ start: "09:00:00", end: "12:00:00" }, { start: "11:00:00", end: "15:00:00" }]) // [{ start: "09:00:00", end: "15:00:00" }]
mergeIntervalsTime([]) // []
mergeIntervalsTime([{ start: "15:00:00", end: "09:00:00" }]) // []

plain/interval/mergeIntervalsTime.ts