CommLab India E Learning Developer Interview Questions and Answers

So prepare good amout of aptitude , and try to solve at least 15 Questions

It was an Online coding test 2 questions were there. difficulty (Easy and Medium).

The third round was again an coding round but it was a pen and paper test , it was in offline mode they will tell you the center after you will complete 2nd round.
In pen and paper test there are 10 coding questions and from topics array , string , recursion , Bit manipulation , BST , Linked List. so you have to solve at least 6-7 questions.

Q1. Questions on HTML, CSS
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Q2. Permutations in string (Can you Backtracking approach). Always try to explain your approach
Ans. 
Generate all permutations of a string using a backtracking approach.
• Backtracking involves exploring all possible configurations and abandoning those that don't meet criteria.

• Start with an empty string and build permutations by adding one character at a time.

• Use a boolean array to track which characters are already included in the current permutation.

• Example: For the string 'abc', the permutations are 'abc', 'acb', 'bac...read more
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Q3. Explain your Project?
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Q1. What is event loop in JS?
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Q2. What is virtual DOM in react
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Q1. Given a 2-D matrix, write a function to perform a spiral traversal of the matrix elements.
Ans. 
A spiral traversal of a 2-D matrix involves visiting elements in a spiral order, starting from the top-left corner.
• Initialization: Define boundaries for the top, bottom, left, and right of the matrix.

• Traversal Order: Move right across the top row, then down the right column, then left across the bottom row, and finally up the left column.

• Boundary Adjustment: After each direction, adjust the boundaries to move inward fo...read more
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Q2. Questions based on sql
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Test was of 1.5 hrs and it was online. It was completely based on technical questions.

This test was offline and it was a pen paper test wherein 10 questions will be given you have to write code or spot the error and correct them.

Q1. Asked questions about React
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Q2. Question based on project
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Data structure and algorithm, easy and medium questions

I have given the online aptitude test of zeus learning (on campus) , which was the very first round and the test was divided into two parts, first part was mostly coding-decoding questions (aptitude) which was easy according to me but it was tricky too and second part included 2 dsa question and both the questions were of easy level.

1st round
25 mcq apptitude + 10 DSA question

Q1. Project review , opps, sql
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Basic Aptitude test followed by 2 coding questions. Test was very easy.

This was pen and paper coding test, where we were given 20 questions and we had to write code on paper. Total time was 2-3 hr.

Q1. Technical Interview, 2 coding questions asked, 1 math question and Basics like OOP, Language specific, etc.
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