Juspay Technologies Softwaretest Engineer Interview Questions and Answers

Q1. Diff between react and jQuery
Ans. 
React is a modern JavaScript library for building user interfaces, while jQuery is a fast and concise JavaScript library for DOM manipulation.
• React is component-based, promoting reusability and modularity.

• React uses a virtual DOM for efficient updates, while jQuery directly manipulates the DOM.

• React is declarative, making it easier to reason about the UI, while jQuery is imperative.

• React is typically used for single-pa...read more
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3 dsa questions medium level

Q1. 2 medium level dp questions based on string and stocks
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Q2. One hard question based on graph
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Q1. Hr questions and java , springboot questions etc
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Q1. Internal Implementation of HashMap
Ans. 
HashMap is implemented using an array of linked lists to handle collisions.
• HashMap stores key-value pairs in an array of linked lists

• Hash function is used to determine the index of the array where the key-value pair will be stored

• Collision handling is done by chaining, where multiple key-value pairs with the same hash value are stored in the same linked list

• HashMap allows null keys and values

• HashMap is not synchronized...read more
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3 medium leetcode questions

Q1. Questions of SQL and DBMS 2 DSA questions
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Q2. Valid parentheses in o(1) space
Ans. 
Check if parentheses are valid in constant space
• Use a counter to keep track of open parentheses

• Increment counter for '(' and decrement for ')'

• If counter goes negative or not zero at end, return false
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Q1. Projects and brain stroming
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Q2. Projects were asked in depth
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Q3. Interviewer had good technical knowledge
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Coding and aptitude round

Q1. Tree dsa questions
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Q1. Horse race question
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Q1. Location specific question
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Q1. Basic Python Questions Work Exp related discussions
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Q2. Snake and Ladder Problem
Ans. 
Snake and Ladder Problem is a classic board game where players move their tokens based on the roll of a dice.
• The game involves a board with numbered squares, where players move their tokens based on the roll of a dice.

• Snakes and ladders on the board can either help a player advance or set them back.

• The game continues until a player reaches the final square, usually 100, to win.
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