Random

random.js

let seed = Date.now();

function randomA() {
  seed = (5 * seed + 3) % 16;
  return seed / 16;
}

function randomB() {
  seed = (seed * 7919 + 1) & 0xffff;
  // upper range is 0xffff (65535) so bring it down to 0-1
  return seed / 0xffff;
}

let ctr = 0;
function randomC(n = 7) {
  ctr++;
  let value = ((((seed >> 9) & 1) ^ ((seed >> 1) & 1)) << 15) | (seed >> 1);

  seed = value;
  value >>= 8; // high byte
  value += ctr;
  value %= n;

  return value / n;
}