Let's Learn Vocabularies

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Frequently Asked Questions

1. What is the difference between var, let, and const?

var is function-scoped, while let and const are block-scoped. const cannot be reassigned.

2. What is the difference between map(), forEach(), and filter()?

map() returns a new array, forEach() iterates without returning, and filter() returns elements that match a condition.

3. What is an Arrow Function and how is it different from a Regular Function?

Arrow functions have a shorter syntax and do not bind their own this, making them useful in callbacks.

4. How do JavaScript Promises work?

Promises handle asynchronous tasks with pending, resolved, and rejected states using .then() and .catch().

5. How do Closures work in JavaScript?

A closure is a function that remembers variables from its outer scope even after the outer function has finished execution.