Series

Frontend Interview Questions

In this series, I'll be writing articles explaining some good frontend interview questions and their solutions. These are the questions, most commonly asked in the interviews that I have taken. Hop on

Articles in this series

Concurrency Control with Promises

Rajat JainRajat Jain
Jul 30, 20234 min read

Question You are given an array of asynchronous tasks that need to be executed concurrently using promises. Each task is represented as a function...

Concurrency Control with Promises

Design an LRU cache

Rajat JainRajat Jain
Mar 17, 20224 min read

What is an LRU Cache Let’s first quickly go over what is cache. Computers have cache memory that temporarily stores the most frequently used data....

Design an LRU cache

Easy Implementation of Promise in JS

Rajat JainRajat Jain
Sep 10, 20216 min read

Disclaimer: In this post, I am not going to implement Promise exactly the way it has been done in the JS specification. This is more likely a frontend...

Easy Implementation of Promise in JS

Shuffle an array in place

Rajat JainRajat Jain
Jun 29, 20213 min read

❓Question Write the function shuffle(array) that shuffles (randomly reorders) elements of the array. Multiple runs of shuffle may lead to different...

Shuffle an array in place

In place deduping an array

Rajat JainRajat Jain
Jun 23, 20213 min read

easy but analytical · ❓Question Given an array containing all kinds of data, please implement a function deduplicate() to remove the duplicates. You...

In place deduping an array

LocalStorage wrapper with expiration

Rajat JainRajat Jain
Jun 22, 20213 min read

because everything in this world has to expire some time · LocalStorage is a simple and handy client-side storage, but you should avoid using it because...

LocalStorage wrapper with expiration