This project is part of the @thi.ng/umbrella monorepo.
Closed/open/semi-open interval data type, queries & operations.
Supports point & range queries and set operations with other intervals (union, intersection, difference).
Furthermore, a parser for ISO 80000-2 / ISO 31-11 interval
notation is provided. See
Interval.parse()
for details.
STABLE - used in production
yarn add @thi.ng/intervals// ES module
<script type="module" src="https://unpkg.com/@thi.ng/intervals?module" crossorigin></script>
// UMD
<script src="https://unpkg.com/@thi.ng/intervals/lib/index.umd.js" crossorigin></script>Package sizes (gzipped, pre-treeshake): ESM: 1.43 KB / CJS: 1.48 KB / UMD: 1.57 KB
import { interval, Interval } from "@thi.ng/intervals";
// [0 .. +∞] (fully closed)
a = Interval.withMin(0);
// [-∞ .. 1) (open on RHS)
b = Interval.withMax(1, true);
i = a.intersection(b);
i.toString();
// [0 .. 1)
// parse from string
interval("[0 .. 1)")
// Interval { l: 0, r: 1, lopen: false, ropen: true }
i.contains(1);
// false (because interval is open on RHS)
i.contains(0.999999);
// true
// classify interval relative to point (true if RHS < x)
i.isBefore(-1)
// false
i.isBefore(1)
// true
// classify interval relative to point (true if LHS > x)
i.isAfter(-1);
// true
i.isAfter(1);
// false
// grow interval to include 2 => [0 ... 2]
i2 = i.include(2);
// sort order: LHS -> RHS
i.compare(i2);
// -1
// classify WRT given interval arg
i.classify(Interval.infinity());
// 3 (aka Classifier.SUBSET)
// create transformed interval
// (here scaled around centroid)
i.map((x) => x + (x - i.centroid()) * 2).toString();
// [-1 .. 2)
// iterator of decimated interval values
[...i.values(0.25)];
// [ 0, 0.25, 0.5, 0.75 ]
// close RHS
i.ropen = false;
[...i.values(0.25)];
// [ 0, 0.25, 0.5, 0.75, 1 ] => now includes 1- Karsten Schmidt (@postspectacular)
© 2018 - 2020 Karsten Schmidt // Apache Software License 2.0