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Fix #3425: removeAllListeners should delete array #3431

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Fix #3425: removeAllListeners should delete array #3431

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11 changes: 2 additions & 9 deletions lib/events.js
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Expand Up @@ -228,15 +228,8 @@ EventEmitter.prototype.removeAllListeners = function(type) {
return this; return this;
} }


var events = this._events && this._events[type]; // does not use listeners(), so no side effect of creating _events[type]
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@TooTallNate The reverted behavior explicitly tries to avoid calling listeners() to avoid creating _events[type]. Is that still needed?. Regarding your proposal in #3425 (comment)

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I personally think that's overkill. I don't consider removeAllListeners() to be a hot code path enough to justify that, but others would need to weigh in on that as well.

if (!events) return this; if (type && this._events && this._events[type]) this._events[type] = null;

if (isArray(events)) {
events.splice(0);
} else {
this._events[type] = null;
}

return this; return this;
}; };


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13 changes: 9 additions & 4 deletions test/simple/test-event-emitter-remove-all-listeners.js
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Expand Up @@ -39,10 +39,15 @@ e1.removeAllListeners('baz');
assert.deepEqual(e1.listeners('foo'), [listener]); assert.deepEqual(e1.listeners('foo'), [listener]);
assert.deepEqual(e1.listeners('bar'), []); assert.deepEqual(e1.listeners('bar'), []);
assert.deepEqual(e1.listeners('baz'), []); assert.deepEqual(e1.listeners('baz'), []);
// identity check, the array should not change // after calling removeAllListeners,
assert.equal(e1.listeners('foo'), fooListeners); // the old listeners array should stay unchanged
assert.equal(e1.listeners('bar'), barListeners); assert.deepEqual(fooListeners, [listener]);
assert.equal(e1.listeners('baz'), bazListeners); assert.deepEqual(barListeners, [listener]);
assert.deepEqual(bazListeners, [listener, listener]);
// after calling removeAllListeners,
// new listeners arrays are different from the old
assert.notEqual(e1.listeners('bar'), barListeners);
assert.notEqual(e1.listeners('baz'), bazListeners);


var e2 = new events.EventEmitter(); var e2 = new events.EventEmitter();
e2.on('foo', listener); e2.on('foo', listener);
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