Randomize Any

A secure randomization utility library that provides various randomization functions, supporting both browser and Node.js environments. You can find it on npm: randomize-any.

Features

  • 🔒 Secure Random: Uses crypto.getRandomValues() for cryptographically secure random number generation

  • 🎯 Multiple Types: Supports randomization of array elements, integers, and floating-point numbers

  • ⚖️ Weight Support: Built-in weighted random algorithms

  • 🌐 Cross-platform: Supports both browser and Node.js environments

  • 📦 Multiple Formats: Provides ESM, CJS, UMD and other module formats

  • 🔧 TypeScript: Complete TypeScript type definitions

Installation

npm install randomize-any

Or using pnpm:

pnpm add randomize-any

Usage

Basic Import

import { randomizeAny, randomizeInteger, randomizeFloat } from 'randomize-any';

API Documentation

randomizeAny(list: any[]): any

Randomly select an element from an array.

Parameters:

  • list - The array to randomly select from

Returns:

  • A random element from the array

Example:

const fruits = ['apple', 'banana', 'orange', 'grape'];
const randomFruit = randomizeAny(fruits);
console.log(randomFruit); // e.g.: 'banana'

const numbers = [1, 2, 3, 4, 5];
const randomNumber = randomizeAny(numbers);
console.log(randomNumber); // e.g.: 3

randomizeInteger(min: number, max: number): number

Generate a random integer within the specified range.

Parameters:

  • min - Minimum value (inclusive)

  • max - Maximum value (inclusive)

Returns:

  • A random integer within the range

Example:

const randomInt = randomizeInteger(1, 10);
console.log(randomInt); // e.g.: 7

const diceRoll = randomizeInteger(1, 6);
console.log(diceRoll); // e.g.: 4

randomizeFloat(min: number, max: number): number

Generate a random floating-point number within the specified range (precision: 0.01).

Parameters:

  • min - Minimum value (inclusive)

  • max - Maximum value (inclusive)

Returns:

  • A random floating-point number within the range

Example:

const randomFloat = randomizeFloat(0, 1);
console.log(randomFloat); // e.g.: 0.73

const temperature = randomizeFloat(20.0, 30.0);
console.log(temperature); // e.g.: 25.67

getSecureWeightedRandom(weights: number[]): number

Generate a secure random index based on a weight array.

Parameters:

  • weights - Weight array

Returns:

  • A random index based on weight distribution

Example:

// Weights [1, 2, 3], index 2 has the highest probability of being selected
const weights = [1, 2, 3];
const randomIndex = getSecureWeightedRandom(weights);
console.log(randomIndex); // 0, 1, or 2

// Practical application: Select prizes based on weights
const prizes = ['Bronze', 'Silver', 'Gold'];
const prizeWeights = [5, 3, 1]; // Bronze has the highest probability
const selectedPrizeIndex = getSecureWeightedRandom(prizeWeights);
const selectedPrize = prizes[selectedPrizeIndex];
console.log(selectedPrize);

Advanced Usage

Combined Usage

import { randomizeAny, randomizeInteger, getSecureWeightedRandom } from 'randomize-any';

// Create a weighted random selector
function weightedRandomSelect(items, weights) {
  const index = getSecureWeightedRandom(weights);
  return items[index];
}

const items = ['Common Item', 'Rare Item', 'Legendary Item'];
const weights = [70, 25, 5]; // 70% common, 25% rare, 5% legendary

const selectedItem = weightedRandomSelect(items, weights);
console.log(selectedItem);

Generate Random Data

// Generate random user data
function generateRandomUser() {
  const names = ['John', 'Jane', 'Bob', 'Alice'];
  const ages = randomizeInteger(18, 65);
  const scores = randomizeFloat(60, 100);
  
  return {
    name: randomizeAny(names),
    age: ages,
    score: Math.round(scores * 100) / 100
  };
}

const user = generateRandomUser();
console.log(user);
// e.g.: { name: 'Jane', age: 28, score: 87.34 }

Browser Support

This library uses the crypto.getRandomValues() API to provide cryptographically secure random numbers. Supported browsers include:

  • Chrome 11+

  • Firefox 21+

  • Safari 3.1+

  • Edge 12+

  • IE 11+

For unsupported environments, it automatically falls back to Math.random().

Module Formats

This package provides multiple module formats:

  • ESM: dist/index.browser.esm.mjs

  • CommonJS: index.js

  • UMD: dist/index.browser.global.js

  • Legacy versions: Compatible versions with polyfills

Development

# Install dependencies
pnpm install

# Run tests
pnpm test

# Build
pnpm build

# Generate coverage report
pnpm coverage

Websites Using This Library

Here are some websites and applications that use randomize-any in production:

🎮 Gaming & Entertainment

  • Colorfle Unlimited - A color wordle use the random algorithm to select daily target color randomly.

  • Flagle Explorer - A flag wordle select daily flag randomly by using weighted randomization.

🎯 Utilities & Tools

Want to showcase your website here? Open an issue or submit a pull request!

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