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The JavaScript implements of TinyMT for Pokémon RNG.

License: MIT License

TypeScript 100.00%

tinymt javascript typescript pokemon

js-tinymt's Introduction

js-tinymt

The JavaScript implements of TinyMT for Pokémon RNG.

⚠️ Note ⚠️

This library is not designed for common use, but for Pokémon RNG. If you want to use for simulation and numerical analysis and so on, I recommend other library.

Installation

$ npm install @mizdra/tinymt -S
# or
$ yarn add @mizdra/tinymt

Usage

import * as assert from 'assert'
import { Tinymt32 } from '@mizdra/tinymt'

function u32 (num) {
  return num >>> 0
}
const param: Tinymt32.Param = {
  mat1: 0x8F7011EE,
  mat2: 0xFC78FF1F,
  tmat: 0x3793fdff,
}
const seed = 1
const status = [0xCCA24D8, 0x11BA5AD5, 0xF2DAD045, 0xD95DD7B2]

// Tinymt32.fromSeed(param, seed)
const rng1 = Tinymt32.fromSeed(param, seed)
assert(u32(rng1.gen()) === 2545341989)
assert(u32(rng1.gen()) === 981918433)
assert.deepEqual(
  [...Array(2)].map((_) => u32(rng1.gen())),
  [3715302833, 2387538352],
)

// Tinymt32.fromStatus(param, status)
const rng2 = Tinymt32.fromStatus(param, status)
rng2.nextState()
assert(u32(rng2.temper()) === 2545341989)
assert(u32(rng2.gen()) === 981918433)
assert(u32(rng2.temper()) === 981918433)
for (let i = 0; i < 2; i++) { rng2.nextState() }
assert.deepEqual(
  rng1.status().map(u32),
  rng2.status().map(u32),
)