off(eventName, listener)

Removes a specific listener for an event. If no listener is provided, all listeners for that event are removed.

Parameters:

• eventName (string) – Event name.
• listener (function, optional) – Specific listener to remove.

Returns: The EventEmitter instance (supports chaining).

Example:

          
            1const fn = (msg) => console.log(msg);2emitter.on("data", fn);3emitter.off("data", fn); // Removes fn
          
        

Edge Cases:

• Calling off with no listener removes all listeners for the event.
• Safe to call off on an event that has no listeners; does nothing.

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