Simple-Events.js

const EventSystem = function () {
  const _storage = {}

  this.addListener = (event, func) => {
    if (!_storage[event]) _storage[event] = []

    _storage[event].push(func)
  }

  this.removeListener = (event, func) => {
    _storage[event] = _storage[event].filter(cb => cb !== func)
  }

  this.removeAll = event => {
    _storage[event] = []
  }

  this.trigger = event => {
    _storage[event].forEach(func => func())
  }
}

const doc = new EventSystem()

const clickOne = () => console.log('click one')
const clickTwo = () => console.log('click two')
const touchOne = () => console.log('tocuh one')

doc.addListener('click', clickOne)
doc.addListener('click', clickTwo)

doc.addListener('touch', touchOne)

console.log('Trigger Click Event')
doc.trigger('click')
console.log()

console.log('Trigger Touch Event')
doc.trigger('touch')
console.log()

doc.removeListener('click', clickOne)
console.log('Trigger Click Event')
doc.trigger('click')
console.log()

doc.removeAll('click', clickOne)
console.log('Trigger Click Event')
doc.trigger('click')
console.log()