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node.js EventEmitter.once (with example) (answer for http://stackoverflow.com/questions/12150540/javascript-eventemitter-multiple-events-once)
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| var EventEmitter = require('events').EventEmitter; | |
| EventEmitter.prototype.once = function(events, handler){ | |
| // no events, get out! | |
| if(! events) | |
| return; | |
| // Ugly, but helps getting the rest of the function | |
| // short and simple to the eye ... I guess... | |
| if(!(events instanceof Array)) | |
| events = [events]; | |
| var _this = this; | |
| var cb = function(){ | |
| events.forEach(function(e){ | |
| _this.removeListener(e, cb); | |
| }); | |
| handler.apply(null, Array.prototype.slice.call(arguments, 0)); | |
| }; | |
| events.forEach(function(e){ | |
| _this.addListener(e, cb); | |
| }); | |
| }; | |
| // EXAMPLE | |
| var game = new EventEmitter(); | |
| game.endGame = function(){ | |
| console.log('Game ended!'); | |
| }; | |
| game.on('player:quit', function(){ | |
| console.log('quit') | |
| }); | |
| game.on('player:disconnect', function(){ | |
| console.log('disconnect') | |
| }); | |
| game.once(['player:quit', 'player:disconnect'], function (a, b, c) { | |
| console.log('Disconnecting...'); | |
| console.log('arg 1: ' + a); | |
| console.log('arg 2: ' + b); | |
| console.log('arg 3: ' + c); | |
| game.endGame() | |
| }); | |
| game.emit('player:disconnect', 1, 2, 3); | |
| game.emit('player:quit', 1, 2, 3); |
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