Mersenne Twister: a good Pseudo Random Number Generator ( PRNG )

PRNG

/*
from : http://en.wikipedia.org/wiki/Mersenne_twister
*/
let MT
let index
class PRNG {
  static setSeed(seed) {
    // Create a length 624 array to store the state of the generator
    MT = new Uint32Array(624)
    index = 0
    MT[0] = seed
    for (let i = 1; i < 624; i++) {
      MT[i] = 1812433253 * (MT[i - 1] ^ ((MT[i - 1] >> 30) + i))
    }
  }

  static extractNumber() {
    if (index === 0) {
      this.generateNumbers()
    }

    let y = MT[index]
    y = y ^ (y >> 11)
    y = y ^ ((y << 7) & 2636928640)
    y = y ^ ((y << 15) & 4022730752)
    y = y ^ (y >> 18)

    index = (index + 1) % 624
    return y
  }

  static generateNumbers() {
    for (let i = 0; i < 624; i++) {
      const y = (MT[i] & 0x80000000) + (MT[(i + 1) % 624] & 0x7fffffff)
      MT[i] = MT[(i + 397) % 624] ^ (y >> 1)
      if (y % 2 !== 0) {
        MT[i] = MT[i] ^ 2567483615
      }
    }
  }

  static random() {
    return this.extractNumber() / 0x7fffffff
  }
}
PRNG.setSeed(1)
export default PRNG
/*
//usage:

    PRNG.setSeed( seed );//seed: any int, uint or number
        
    PRNG.random(); //returns a pseudo-random value between 0 & 1
*/