theprogrammablemind/src/debug.js

const counters = {}
const hits = {}

let db = () => {
  debugger // eslint-disable-line no-debugger
}

const reset = () => {
  Object.keys(counters).forEach(key => delete counters[key])
  Object.keys(hits).forEach(key => delete hits[key])
  db = () => { debugger } // eslint-disable-line no-debugger
}

const getDb = () => {
  return db
}

const setDb = (value) => {
  db = value
}

const hit = (name) => {
  hits[name] = true
}

const unhit = (name) => {
  hits[name] = false
}

const wasHit = (name) => {
  return hits[name]
}

const counter = (name, breakAt = [], debugBreak = true) => {
  if (!counters[name]) {
    counters[name] = 0
  }
  counters[name] += 1
  console.log(`counters[${name}] = ${counters[name]}`)
  unhit(name)
  if (Array.isArray(breakAt) && breakAt.includes(counters[name])) {
    if (debugBreak) {
      db()
    }
    hit(name)
    return true
  } else if (breakAt == counters[name]) {
    if (debugBreak) {
      db()
    }
    hit(name)
    return true
  }
}

const get = (name) => {
  return counters[name]
}

const _break = (name) => {
  if (wasHit(name)) {
    db()
  }
}

module.exports = {
  counter,
  get,
  _break, // break is a keyword

  // used for tests
  reset,
  hit,
  unhit,
  wasHit,
  getDb,
  setDb
}