createFrequencyCheck.ts

// the returned function will return true at regular intervals p% of the time it gets called.
// use instead of (i % N === 0) checks, whenever other frequencies other than (1 / someInteger) are needed.
// as accumulated values carry over, we can change the targetd frequency at runtime.
const createFrequencyCheck = () => {
  let sum = 0
  return (p: number) => {
    sum += p
    if (sum >= 1) {
      sum = sum - Math.trunc(sum)
      return true
    }
    return false
  }
}