EventEmitter.hasListener

Check if the object has any listener or specified listener function.

Usage

emitter.hasListener()
emitter.hasListener(event);
emitter.hasListener(event, listener);

Arguments

Argument	Type	Required	Description
event	string		The name of the event.
listener	function		A function.

Return

In the first form, the method returns true if the event emitter has any events at all.

In the second form, the method returns true if the event emitter has listeners for specified event.

In the third form, the method returns true the event emitter has specified listener for specified event.

In any other case method returns false.