@seroh/roll/dist/randomizer/SeededRandomizer.js

An RPG dice-rolling library with a variety of built-in roll mechanics.

import { Randomizer } from "./Randomizer";
export class SeededRandomizer extends Randomizer {
    seed;
    static LCG_MULTIPLIER = 1664525;
    static LCG_INCREMENT = 1013904223;
    static LCG_MODULUS = 2 ** 32;
    constructor(seed) {
        super();
        this.seed = seed;
        this.validateSeed(seed);
    }
    generator() {
        return this.lcg(this.seed);
    }
    // Linear Congruential Generator (LCG) implementation
    lcg(seed) {
        this.seed =
            (SeededRandomizer.LCG_MULTIPLIER * seed + SeededRandomizer.LCG_INCREMENT) % SeededRandomizer.LCG_MODULUS;
        return this.seed / SeededRandomizer.LCG_MODULUS;
    }
    validateSeed(seed) {
        if (!Number.isInteger(seed)) {
            throw new Error("Seed must be an integer.");
        }
        if (seed < 0 || seed >= 2 ** 32) {
            throw new Error("Seed must be a 32-bit unsigned integer (0 <= seed < 2^32).");
        }
    }
}
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