True Random Generator

rando.js

/**
* This small gist is based on https://github.com/nastyox/Rando.js
* The idea of this gist is to have a compatible node and browser script that can replace Math.random()
* using crypto libraries built-in in node and browser and without the extra baggage for automatic object
* array o string behaviours
* it fallbacks to Math.random()
**/

const rando = () => {
  try {
    let crypto
    try {
      crypto = require('crypto').randomFillSync
    } catch (_) {
      crypto = (window.crypto || window.msCrypto).getRandomValues
    }
    let cryptoRandoms
    const cryptoRandomSlices = []
    let cryptoRandom
    while ((cryptoRandom = '.' + cryptoRandomSlices.join('')).length < 30) {
      cryptoRandoms = crypto(new Uint32Array(5))
      for (let i = 0; i < cryptoRandoms.length; i++) {
        const cryptoRandomSlice = cryptoRandoms[i] < 4000000000 ? cryptoRandoms[i].toString().slice(1) : ''
        if (cryptoRandomSlice.length > 0) cryptoRandomSlices[cryptoRandomSlices.length] = cryptoRandomSlice
      }
    }
    return Number(cryptoRandom)
  } catch (_) {
    return Math.random()
  }
}

/**
* USAGE: rando()
**/
// console.log(rando())