7 questions for “Events & EventEmitter”

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7 questions in 1 technology

#	Question	Technology	Topic	Level
1	How do you create a custom class that emits events by extending Node's built-in EventEmitter? Node.js › Events & EventEmitter	Node.js	Events & EventEmitter	Beginner
2	How does the 'once' method differ from 'on' when subscribing to an EventEmitter's events, and when would you use it? Node.js › Events & EventEmitter	Node.js	Events & EventEmitter	Intermediate
3	What happens when an EventEmitter emits an event that has an 'error' listener versus one that doesn't? Node.js › Events & EventEmitter	Node.js	Events & EventEmitter	Intermediate
4	What is the default maximum listener limit on an EventEmitter, and why does Node.js warn when it's exceeded? Node.js › Events & EventEmitter	Node.js	Events & EventEmitter	Advanced
5	How would you implement a custom event that carries multiple pieces of data, and what's the convention for structuring the emitted payload? Node.js › Events & EventEmitter	Node.js	Events & EventEmitter	Advanced
6	What does the node:events module's EventEmitter class provide, and what naming convention do most Node.js core APIs follow when using it? Node.js › Core Node.js Modules	Node.js	Core Node.js Modules	Beginner
7	What is the Observer pattern, and how does Node.js's EventEmitter class implement it natively? Node.js › Architecture & Design Patterns	Node.js	Architecture & Design Patterns	Advanced