Node.js - Debugging and Profiling
Which method correctly unregisters an event listener in Node.js to avoid memory leaks?
Which method correctly unregisters an event listener in Node.js to avoid memory leaks?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Understand event listener removal
Node.js introduced 'off' as modern syntax to remove listeners.Step 2: Compare methods
'removeListener' is older; 'off' is preferred for clarity and consistency.Final Answer:
emitter.off(eventName, listenerFunction) -> Option CQuick Check:
Use 'off' to remove listeners [OK]
Quick Trick: Use emitter.off() to remove listeners [OK]
Common Mistakes:
- Using non-existent methods like deleteListener
- Confusing removeListener with off
- Assuming clearListener exists
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