Perpetualblock Technologies Junior Software Engineer Interview Questions, Process, and Tips

Basic aptitude questions

Q1. What is object oriented programming
Ans. 
Object oriented programming is a programming paradigm based on the concept of objects, which can contain data and code.
• OOP focuses on creating objects that interact with each other to solve problems

• Encapsulation, inheritance, and polymorphism are key principles of OOP

• Examples of OOP languages include Java, C++, and Python
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Q2. Find the duplicate from the string
Ans. 
Find duplicates in a string array
• Iterate through the array and store each element in a hash set

• If an element is already in the hash set, it is a duplicate
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Q3. Do you know async and await in javascript
Ans. 
Async and await are keywords in JavaScript used to work with asynchronous code, making it easier to write and understand.
• Async functions return a Promise, which allows the function to pause execution and wait for a Promise to resolve before continuing.

• Await can only be used inside an async function to pause execution until a Promise is settled.

• Async/await is syntactic sugar built on top of Promises, making asynchronous...read more
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Q1. Explain your academic projects
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Q2. Write a code to find longest and smallest string from the array
Ans. 
Code to find longest and smallest string from array of strings
• Iterate through the array and compare lengths to find longest and smallest strings

• Use built-in functions like length() to determine string lengths

• Consider edge cases like empty array or strings of equal length
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