[!NOTE] This is one of 211 standalone projects, maintained as part of the @thi.ng/umbrella monorepo and anti-framework.

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• About
  • Random distributions
  • Other utilities
• Status
• Support packages
• Related packages
• Installation
• Dependencies
• Usage examples
• API
• Authors
• License

About

Pseudo-random number generators w/ unified API, distributions, weighted choices, ID generation.

[!IMPORTANT] In July 2024 this package was restructured and split-up to extract some features into smaller more focused packages:

• @thi.ng/uuid

This package provides the IRandom interface and various (mostly seedable) pseudo-random number generator implementations, incl. IRandom wrappers for Math.random() (or other external PRNGs) and window.crypto:

• Crypto
• SFC32
• Smush32
• System
• WrappedRandom
• Xoshiro128
• XorShift128
• XorWow
• XsAdd

Partially ported from C implementations taken from c.thi.ng.

Random distributions

• exponential()
• gaussian()
• geometric()
• normal()
• uniform()

Other utilities

• coin() / fairCoin()
• pickRandom() / pickRandomKey()
• randomBytes() / randomBytesFrom()
• randomID()
• weightedRandom() / weightedRandomKey()
• uniqueIndices() / uniqueValuesFrom()

Status

STABLE - used in production

Search or submit any issues for this package

Support packages

• @thi.ng/random-fxhash - @thi.ng/random compatible wrapper & utilities for fxhash's PRNG

Related packages

• @thi.ng/ksuid - Configurable K-sortable unique IDs, ULIDs, binary & base-N encoded, 32/48/64bit time resolutions

Installation

yarn add @thi.ng/random

ESM import:

import * as rnd from "@thi.ng/random";

Browser ESM import:

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

JSDelivr documentation

For Node.js REPL:

const rnd = await import("@thi.ng/random");

Package sizes (brotli'd, pre-treeshake): ESM: 1.93 KB

Dependencies

• @thi.ng/api
• @thi.ng/errors

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

Usage examples

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

| Screenshot | Description | Live demo | Source | |:-----------------------------------------------------------------------------------------------------------------------------|:-----------------------------------------------------------------------------------------|:------------------------------------------------------------|:-----------------------------------------------------------------------------------------| | | Self-modifying, animated typographic grid with emergent complex patterns | Demo | Source | | | Probabilistic color theme generator | Demo | Source | | | Interactive inverse FFT toy synth | Demo | Source | | | 2D Bezier curve-guided particle system | Demo | Source | | | Basic hiccup-based canvas drawing | Demo | Source | | | Barnsley fern IFS fractal renderer | Demo | Source | | | k-means clustering visualization | Demo | Source | | | Randomized space-filling, nested grid layout generator | Demo | Source | | | Randomized 4-point 2D color gradient image generator | Demo | Source | | | Interactive pixel sorting tool using thi.ng/color & thi.ng/pixel | Demo | Source | | | Animated, iterative polygon subdivisions & visualization | Demo | Source | | | Procedural stochastic text generation via custom DSL, parse grammar & AST transformation | Demo | Source | | | Basic usage of thi.ng/rdom keyed list component wrapper | Demo | Source | | | Generative audio synth offline renderer and WAV file export | Demo | Source | | | Evolutionary shader generation using genetic programming | Demo | Source | | | Responsive & reactively computed stacked column layout | Demo | Source | | | thi.ng/rdom & thi.ng/rstream based quiz to guess thi.ng package names | Demo | Source | | | Animated t-SNE visualization of 4D data | Demo | Source | | | Game of Life implemented as WebGL2 multi-pass shader pipeline | Demo | Source |

API

Generated API docs

import { Smush32 } from "@thi.ng/random";

const rnd = new Smush32(0xdecafbad);

// the following methods are available for all generators

// next uint (0 .. 2^32-1)
rnd.int()
// 4022849029

// next float [0.0 .. 1.0)
rnd.float()
// 0.2698542904737066

// next normalized float (w/ opt scale)
// [-scale .. +scale)
rnd.norm(100)
// 57.70723665079737

// next float in given interval [min .. max)
rnd.minmax(10, 20)
// 15.295951807707537

rnd.minmaxInt(10, 20)

Authors

• Karsten Schmidt

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

@misc{thing-random,
  title = "@thi.ng/random",
  author = "Karsten Schmidt",
  note = "https://thi.ng/random",
  year = 2015
}

License

© 2015 - 2025 Karsten Schmidt // Apache License 2.0