PayMate India Software 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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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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Test was based on arrays and some dsa concepts.

Q1. What is Java String pool?
Ans. 
Java String pool is a special memory area in Java heap where String literals are stored to optimize memory usage.
• String pool is a part of Java heap memory.

• String literals are stored in the String pool to avoid duplicate objects.

• Strings created using double quotes are stored in the String pool.

• Strings created using new keyword are not stored in the String pool.
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Q1. Did you have any conflicts with your peers and have did you handle it?
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There was a hacker rank assignment

Leetcode style question, medium

Q1. System design question normal
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Coding question of moderate difficulty

Q1. They asked Java coding question
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