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EventEmitter#once only takes instanceof function

pull/22966/head
Aaron Heckmann 2011-03-15 09:01:24 -04:00 committed by Ryan Dahl
parent 52b9ede6db
commit a4dad95be3
1 changed files with 4 additions and 0 deletions
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4
lib/events.js
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@ -137,6 +137,10 @@ EventEmitter.prototype.addListener = function(type, listener) {
EventEmitter.prototype.on = EventEmitter.prototype.addListener; EventEmitter.prototype.on = EventEmitter.prototype.addListener;
EventEmitter.prototype.once = function(type, listener) { EventEmitter.prototype.once = function(type, listener) {
if ('function' !== typeof listener) {
throw new Error('.once only takes instances of Function');
}
var self = this; var self = this;
self.on(type, function g() { self.on(type, function g() {
self.removeListener(type, g); self.removeListener(type, g);