mersenne-twister-serializable
A serializable Mersenne Twister
A modification of fast-mersenne-twister
to support serializing / deserializing (allows to save / restore the seed) and with compatibility enhancements for older browsers/environments.
Usage
const { createMersenneTwister } = require('mersenne-twister-serializable');
let twister = createMersenneTwister(1234567890);
console.log(twister.random()); // 0.6187947695143521
let state = twister.save(); // state is an Object that can be serialized to JSON
console.log(twister.random()); // 0.3405089376028627
twister.restore(state);
console.log(twister.random()); // 0.3405089376028627
let another = createMersenneTwister(state);
console.log(another.random()); // 0.3405089376028627
You can also use an array seed:
const { createMersenneTwister } = require('mersenne-twister-serializable');
let twister = createMersenneTwister([1234, 5678, 9012]);
console.log(twister.random()); // 0.22977210697717965
Methods
All of the original methods are available on the MersenneTwister object returned by the exported function.
They are also aliased to more readable / convenient names.
Convenience | Original | Return |
---|---|---|
randomNumber |
genrand_int32 |
32 bit integer, [0,0xffffffff] |
random31Bit |
genrand_int31 |
31 bit integer, [0,0x7fffffff] |
randomInclusive |
genrand_real1 |
float, [0,1] |
random |
genrand_real2 |
float, [0,1) (this is just like what Math.random() returns) |
randomExclusive |
genrand_real3 |
float, (0,1) |
random53Bit |
genrand_res53 |
float, [0,1) with 53-bit resolution |
save |
toJSON |
serializable Object with Number n and Array d
|
restore |
fromJSON |
void |
Notes
- Extremely true to the original algorithm by Matsumoto & Nishimura
- Converted to JavaScript by Stephan Brumme
- This version cannot be initialized with an array
- Updated by Thomas Randolph for compliance and performance
- with all of the original random generators
- with the ability to be initialized with an array
- with the correct range (the original only outputs unsigned integers, while Stephan's version outputs signed integers)
- Updated by Jimb Esser
- with my code style
- to support saving/restoring
- to support older browsers/environments
- performance optimizations