10 line event emitter. Because yeah, you really don't need much else. https://gist.github.com/yoshuawuyts/31dace8a9a485ed345d0b37ab4b2db25 …
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return () => this.listeners[event] = this.listeners[event].filter(c => c != cb);
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But what if an unsubscribe happens as the result of an `.on`? With splice, you get different behavior depending upon the order that the events were bound.
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I can’t imagine a scenario where that extra array would actually be a bottleneck.
End of conversation
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