devtools.tech | The only way to prepare for frontend interviews

Devtools Tech

Team Devtools Tech Official Profile

Certificates

Certificate for JavaScript Memory and Garbage Collection

JavaScript Memory and Garbage Collection

Issued 6 October 2026

How to create an grid lights interactive shape? Uber Frontend Interview Question | JavaScript | React.js

30,761

Build Country Capital Game | Microsoft Frontend Interview Question | JavaScript | React.js

29,039

How to build a File Explorer? Atlassian Frontend Machine Coding Round Question | JavaScript Interview Question | React.js

42,070

How to create OTP Input Component? | Frontend Coding Challege | JavaScript | HTML | CSS | React.js

18,636

What is the output of the following code snippet? | JavaScript Fundamentals | Frontend Interview Question

13,437

Can you identify the behaviour of following code snippet? | JavaScript Output Questions | Problem Solving | JavaScript Copy

16,218

Is Fetch API part of JavaScript Engine or JavaScript Runtime?

14,207

Which function is used to serialize an object into a JSON string in Javascript?

12,747

What will be the output of the following code snippet? JavaScript Min, Max

11,985

What is the use of the <noscript> tag in Javascript?

11,235

How the comparison happens with switch cases in JavaScript?

11,799

Which of the following keywords are used to define a variable in JavaScript?

8,377

What is the paradigm of JavaScript language?

13,762

What is the output of the following code? - Promise Scheduling | Event Loop | JavaScript Quiz

18,066

How to create analytics SDK in JavaScript?

6,920

How to implement Array.isArray? JavaScript Interview Question | Array Polyfills

7,624

How to implement Array.prototype.filter? JavaScript Interview Question | Array Polyfills

5,941

How to implement a prize calculator? JavaScript Interview Question

4,790

Implement Count By | JavaScript Problem Solving

3,603

Implement a Credit Card Masker | Klarna Frontend Interview Question | JavaScript

6,854

How to create a loading animation? | Frontend Coding Challenge | React.js | JavaScript

6,403

How to build a Pagination component in React.js? | Razorpay Interview Question | JavaScript

7,283

How to implement a function to convert a string input into an object? | Razorpay Interview Question | JavaScript

7,681

How to find the most frequent word in a paragraph? Frontend Problem Solving | JavaScript

5,605

Implement a function that returns the number of parameters expected by a function in JavaScript

5,149

How to implement pipe utility? | Razorpay Interview Question | JavaScript

6,588

How to check deep equality between JavaScript objects? | Zeta Frontend Interview Question

7,781

Build a FAQ page | Frontend Coding Challenge | React.js | HTML | CSS | JavaScript

7,680

Implement promiseMerge | Frontend Problem Solving | JavaScript

5,871

Build a GIF Search Engine | Frontend Coding Challenge | React.js | JavaScript

6,674

Implement a function that creates an array of values not included in other array | Lodash Difference | JavaScript Interview Question

5,817

Implement a function to convert all object keys to camel case | JavaScript Interview Question

5,694

Implement a function to split an array into groups of a certain length | Chunk | JavaScript Interview Question | Lodash Polyfills

5,529

Implement a function to generate a range of numbers | Range I | JavaScript Interview Question | Lodash Polyfills

5,635

How to implement getElementsByTagName? | Frontend Problem Solving | JavaScript Interview Question

6,761

How to implement getElementsByClassName? | Frontend Problem Solving | JavaScript Interview Question

5,684

Implement Promise Polyfill | JavaScript Interview Question | Promise Polyfills | Frontend Problem Soving

9,130

Debug and Fix the Feedback Modal Component in React.js | Frontend Coding Challenge | Debugging Round | JavaScript

5,718

How to Sort an Array of Objects by Property Values? | Frontend Problem Solving | JavaScript Interview Questions | Lodash Polyfill

4,803

How to mimic componentDidUpdate using React Hooks? useDidUpdate Custom Hook | React Interview Question | JavaScript

5,726

How to implement String.prototype.repeat? | String Polyfills | Frontend Problem Solving | JavaScript Interview Question

3,975