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Frequently Asked Questions

What are the difference between var, let, and const?

In JavaScript, var is function-scoped, let is block-scoped and reassignable, while const is block-scoped and immutable after assignment.

What are the difference between map(), forEach(), and filter()

map() transforms elements into a new array, forEach() iterates without returning, and filter() selects elements based on a condition.

explain arrow functions and how they are different from regular functions?

Arrow functions are shorter, don’t have their own this, and can’t create objects like regular functions that use the function keyword.

how JavaScript Promises work?

JavaScript Promises handle asynchronous tasks. They have three states: pending, resolved, or rejected, using .then(), .catch(), and .finally() for execution.

how closures work in JavaScript?

Closures in JavaScript happen when a function remembers and accesses variables from its outer scope, even after the outer function finishes.