UI Technical Lead Interview Questions and Answers

Event emitter in JavaScript allows objects to subscribe and listen for events.

• Event emitter is a design pattern where an object (the emitter) maintains a list of listeners and notifies them of events.

• Listeners can subscribe to specific events and execute a callback function when the event is emitted.

• Example: const emitter = new EventEmitter(); emitter.on('event', () => { console.log('Event emitted!'); }); emitter.emit('event');

• EventEmitter is a built-in module in Node.js that...read more

Implement a click counter in React

• Create a state variable to store the count

• Increment the count when a button is clicked

• Display the count in the UI

OOPS stands for Object-Oriented Programming System. It is a programming paradigm based on the concept of objects.

• OOPS focuses on creating objects that contain data and methods to manipulate that data.

• Encapsulation is the concept of bundling data and methods that operate on the data within a single unit, called an object.

• Inheritance allows one class to inherit properties and behavior from another class.

• Polymorphism allows objects to be treated as instances of their parent clas...read more