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function EventEmitter() {
this.listeners = {};
}
EventEmitter.prototype.emit = function (event) {
if (!(event in this.listeners)) {
return;
}
this.listeners[event].forEach(function (listener) {
listener.apply(this, arguments);
}.bind(this));
};
EventEmitter.prototype.addListener = function (event, f) {
this.listeners[event] = this.listeners[event] || [];
this.listeners[event].push(f);
};
EventEmitter.prototype.removeListener = function (event, f) {
if (!(event in this.listeners)) {
return false;
}
var index = this.listeners[event].indexOf(f);
if (index >= 0) {
this.listeners[event].splice(index, 1);
}
};
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