Learnyst 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?
Ans. 
Developed a web application for managing inventory and sales for a retail store.
• Used HTML, CSS, and JavaScript for front-end development.

• Implemented backend functionality using Node.js and MongoDB for database management.

• Incorporated user authentication and authorization features for secure access.

• Integrated payment gateway for online transactions.

• Utilized responsive design for mobile compatibility.
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Q1. What is event loop in JS?
Ans. 
The event loop in JavaScript manages asynchronous operations, allowing non-blocking execution of code.
• JavaScript is single-threaded, meaning it can only execute one task at a time.

• The event loop continuously checks the call stack and the message queue.

• When the call stack is empty, the event loop pushes the first message from the queue to the stack for execution.

• Example: setTimeout(() => console.log('Hello'), 1000) a...read more
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Q2. What is virtual DOM in react
Ans. 
The virtual DOM is a lightweight representation of the actual DOM used by React to optimize rendering and improve performance.
• The virtual DOM is a JavaScript object that mirrors the structure of the real DOM.

• React uses the virtual DOM to determine what changes need to be made to the actual DOM.

• When a component's state changes, React updates the virtual DOM first, then compares it with the real DOM (a process called rec...read more
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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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