pink-coin

Flip for a random true/false value. By default, a PinkCoin acts as you would expect a normal coin to, however, you can adjust its behavior. Want a player to receive a "random" bonus at the end of a fight with a 5% chance, but don't want them to go more than 20 fights without getting it? Initiate the coin with

const PinkCoin = require("pink-coin");
const coin = new PinkCoin({ initialProbability: 0.05, maxConsecutive: 20 });

then use the didChange property on the flip result to see if the player receives the bonus

if (coin.next().didChange === true) {
  // grant bonus
}

The coin above will behave with a 5% chance of changing from heads to tails (which will set didChange to true) until it misses 20 times, then there will be a 100% chance of triggering.

Options

maxConsecutive : The maximum number of times heads or tails can appear in a row. Default : Number.POSITIVE_INFINITY

initialProbability : The probability of changing from heads to tails or tails to heads (where didChange is true). Default : 0.5

randomFunction : The function used by the coin to generate random, or pseudorandom, numbers used to update the state. Default : Math.random

adjustmentScale : The function used to adjust the probability of a change event occurring for every time it doesn't occur. Default : (x) => Math.pow(x, Number.MAX_SAFE_INTEGER) (This means the probability is effectively unchanged until the maxConsecutive value is reached then it is 1)