'use strict'
var isArray = require('isarray')
module.exports = EventTarget
function EventTarget () { this._events = {} } EventTarget.prototype.addEventListener = function addEventListener (name, callback) { if (typeof callback !== 'function') return if (!isArray(this._events[name])) this._events[name] = [] this._events[name].push(callback) } EventTarget.prototype.removeEventListener = function removeEventListener (name, callback) { if (!name || !callback) return var events = this._events[name] if (isEmpty(events)) return var listener if (events.length === 1) { listener = events[0] if (listener === callback) { events.length = 0 delete this._events[name] } return } for (var i = 0; i < events.length; i++) { listener = events[i] if (listener === callback) events.splice(i, 1) } } EventTarget.prototype.send = function send (name) { var events = this._events[name] if (isEmpty(events)) return var args = Array.prototype.slice.call(arguments, 1) var callback for (var i = 0; i < events.length; i++) { callback = events[i] callback.apply(this, args) } }
function isEmpty (events) { return !events || !events.length }