Javascript Coding Interview Questions Pdf - 1

Question: 1

How do you handle errors in JavaScript?

Errors in JavaScript can be handled using try-catch blocks to catch exceptions and handle them gracefully, preventing the program from crashing.

Question: 2

What are modules in JavaScript?

Modules are reusable pieces of code that encapsulate related functionality. They help in organizing code, managing dependencies, and promoting reusability.

Question: 3

Explain the concept of prototypal inheritance and how it differs from classical inheritance.

Prototypal inheritance is a mechanism in JavaScript where objects inherit properties and methods from other objects through prototype chains. It differs from classical inheritance, which involves the creation of classes and instances, by being more flexible and dynamic.

Question: 4

What are closures and how can they lead to memory leaks in JavaScript?

Closures are functions that have access to their outer function's scope even after the outer function has finished executing. They can lead to memory leaks if they hold references to large objects or variables that are no longer needed, preventing them from being garbage collected.

Question: 5

What is the event loop in JavaScript?

The event loop is a mechanism that handles asynchronous operations in JavaScript, ensuring that they are executed in a non-blocking manner.