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var timers = (function() {
  //
  var timers = []

  //
  const getIndex = (array, attr, value) => {
      for (let i = 0; i < array.length; i += 1) {
          if (array[i][attr] === value) {
              return i
          }
      }
      return -1
  };

  // add
  const add = (callback, time) => {
    var id = setTimeout(() => {
      let index = getIndex(timers, 'id', id)
      timers.splice(index, 1)
      callback()
    }, time)
    timers.push({
      id: id,
      time: time,
      debug: callback.toString()
    })
  };

  // get all active timers
  const all = () => timers

  // stop timer by timer id
  const stop = (id) => {
    if (!isNaN(id)) {
      let index = getIndex(timers, 'id', id)
      if (index !== -1) {
        clearTimeout(timers[index].id)
        timers.splice(index, 1)
      }
    }
  };

  // stop all timers
  const stopAll = () => {
    for (let i = 0; i < timers.length; i++) {
      clearTimeout(timers[i].id)
    }
    timers = []
  };

  return {
    add: add,
    all: all,
    stop: stop,
    stopAll: stopAll,
  };
})();

//
timers.add(function() {
  console.log("timeout 1 fired");
}, 1000)

timers.add(function() {
  console.log("timeout 2 wont get fired");
}, 2000)

timers.add(function() {
  console.log("timeout 3 fired");
}, 3000)

timers.add(function() {
  console.log("timeout 4 fired, timers", timers.all());
}, 4000)

timers.add(function() {
  console.log("timeout 5 fired");
}, 5000)

console.log('All timers', timers.all())

console.log("kill timer 2")
timers.stop(2)