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• About
• Status
• Installation
• Dependencies
• Usage examples
• API
  • Binary search result predicates
• Authors
• License

About

Array / Arraylike utilities.

Status

STABLE - used in production

Search or submit any issues for this package

Installation

yarn add @thi.ng/arrays

ESM import:

import * as arr from "@thi.ng/arrays";

Browser ESM import:

<script type="module" src="https://esm.run/@thi.ng/arrays"></script>

JSDelivr documentation

For Node.js REPL:

const arr = await import("@thi.ng/arrays");

Package sizes (brotli'd, pre-treeshake): ESM: 3.17 KB

Dependencies

• @thi.ng/api
• @thi.ng/checks
• @thi.ng/compare
• @thi.ng/equiv
• @thi.ng/errors
• @thi.ng/random

Note: @thi.ng/api is in most cases a type-only import (not used at runtime)

Usage examples

Six projects in this repo's /examples directory are using this package:

Screenshot	Description	Live demo	Source
	k-means clustering visualization	Demo	Source
	Randomized 4-point 2D color gradient image generator	Demo	Source
	Animated, iterative polygon subdivisions & visualization	Demo	Source
	Responsive image gallery with tag-based Jaccard similarity ranking	Demo	Source
	Responsive & reactively computed stacked column layout	Demo	Source
	Tree-based UI to find & explore thi.ng projects via their associated keywords	Demo	Source

API

Generated API docs

• arrayIterator()
• argMin() / argMax()
• argSort()
• binarySearch()
• bisect()
• blit1d() / blit2d()
• endsWith()
• ensureArray()
• ensureIterable()
• fillRange()
• find()
• findSequence()
• floydRivest()
• fuzzyMatch()
• insert()
• into()
• isSorted()
• levenshtein()
• multiSwap()
• peek()
• permutation()
• quickSort()
• rotate() / rotateTyped()
• selectThresholdMin() / selectThresholdMax()
• shuffle() (w/ custom PRNG support)
• shuffleRange() (w/ custom PRNG support)
• sortByCachedKey()
• startsWith()
• swap()
• swizzle()
• topoSort()

Binary search result predicates

The following predicates can be used to perform predecessor / successor queries using binarySearch().

• bsLT() - Returns index of last item less than search value or -1 if no such values exist
• bsLE() - Similar to bsLT(), but for less-than-equals queries
• bsGT() - Returns index of first item greater than search value or -1 if no such values exist
• bsGE() - Similar to bsGT(), but for less-than-equals queries
• bsEQ() - Merely syntax sugar, casting any non-found result indices to -1

import { binarySearch, bsGT, bsLT } from "@thi.ng/arrays";

const src = [10, 20, 30, 40];

bsLT(binarySearch(src, 25))
// 1

// greater-than queries also require the array length

bsGT(binarySearch(src, 25), src.length)
// 2

bsGT(binarySearch(src, 40), src.length)
// -1

Authors

• Karsten Schmidt

If this project contributes to an academic publication, please cite it as:

@misc{thing-arrays,
  title = "@thi.ng/arrays",
  author = "Karsten Schmidt",
  note = "https://thi.ng/arrays",
  year = 2018
}

License

© 2018 - 2025 Karsten Schmidt // Apache License 2.0