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doc: emitter.removeListener within emit cycle clarification #4764

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doc: emitter.removeListener within emit cycle clarification #4764

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3 changes: 2 additions & 1 deletion doc/api/events.markdown
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Expand Up @@ -339,7 +339,8 @@ Removes the specified `listener` from the listener array for the specified
`removeListener` will remove, at most, one instance of a listener from the
listener array. If any single listener has been added multiple times to the
listener array for the specified `event`, then `removeListener` must be called
multiple times to remove each instance.
multiple times to remove each instance. Listeners removed from an event from
within the emit cycle of that event will still be called in that emit cycle.
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The term emit cycle isn't defined anywhere, is it? It might be better to say that it will run all listeners attached at the time an event is emitted. This is sort of tricky to explain just in text, and a code example would be extremely helpful.

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I would argue that a unit test to prove that this happens would be good too.


Because listeners are managed using an internal array, calling this will
change the position indices of any listener registered *after* the listener
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