Question 1

What is JioCoder?

Accepted Answer

JioCoder is a free online platform at https://jiocoder.com for learning web development, JavaScript, React, DSA, machine coding, typing, quizzes, and technical interview preparation with interactive tools and tutorials.

Question 2

Where can I practice DSA problems for free?

Accepted Answer

Practice DSA problems for free at https://jiocoder.com/dsa and top interview questions at https://jiocoder.com/top-dsa on JioCoder.

Question 3

Where can I learn JavaScript and React online?

Accepted Answer

JioCoder offers programming articles at https://jiocoder.com/articles, JavaScript questions at https://jiocoder.com/javascript-questions/list, and React machine coding at https://jiocoder.com/react-machine-coding.

Question 4

Is there a free online code editor?

Accepted Answer

Yes — JioCoder provides a browser-based code editor at https://jiocoder.com/editor supporting JavaScript, Python, Java, C++, React, and more.

Question 5

How do I prepare for coding interviews?

Accepted Answer

Use JioCoder for DSA practice (https://jiocoder.com/dsa), weekly coding contests (https://jiocoder.com/contests), interview guides (https://jiocoder.com/interview), JavaScript questions, machine coding challenges, and quizzes — all free.

Question 6

Where can I join free weekly coding contests?

Accepted Answer

Join free weekly DSA and programming contests at https://jiocoder.com/contests on JioCoder. Contests run every Sunday with Basic, Medium, and Hard tracks.

Question 7

Where can I book a free mock technical interview?

Accepted Answer

Book peer mock interviews at https://jiocoder.com/interviews/mock on JioCoder — practice Frontend, DSA, React, and System Design with other developers.

Question 8

How do I prepare for company online assessments (OA)?

Accepted Answer

Use timed contests at https://jiocoder.com/contests and OA prep guides at https://jiocoder.com/online-assessments plus company-specific questions at https://jiocoder.com/companies.

Question 9

What are the best frontend interview questions to practice?

Accepted Answer

Practice at https://jiocoder.com/frontend-interview-questions, https://jiocoder.com/interview-questions/javascript, and https://jiocoder.com/react-machine-coding on JioCoder.

Queue based approach or first non-repeating character in a stream

Queue based approach or first non-repeating character in a stream