Junglee Games Sdet Interview Questions and Answers

There were two coding questions; one was related to linked lists, and the other was linked to binary trees.

Q1. Can you elaborate on the project discussion you mentioned in your resume?
Ans. 
Developed a web application for tracking inventory and sales data
• Used React for front-end development

• Implemented RESTful APIs using Node.js and Express for back-end

• Utilized MongoDB for database management

• Integrated authentication and authorization features for secure access

• Implemented data visualization using Chart.js
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Q2. Can you provide the code to reverse a linked list?
Ans. 
Reversing a linked list involves changing the direction of pointers to go from the end to the beginning.
• Start by initializing three pointers: current, previous, and next.

• Iterate through the linked list, updating the pointers to reverse the direction of the links.

• Update the head of the linked list to point to the new first node, which was the original last node.
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Q3. Some questions were asked regarding the four pillars of Object-Oriented Programming (OOP)?
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Q4. Questions related to pointers, dangling pointers.
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Q1. Program for finding the perfect squares between two numbers.
Ans. 
Program to find perfect squares between two numbers
• Iterate through numbers between the given range

• Check if the square root of the number is an integer

• If yes, then it is a perfect square
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Q2. What are smart pointers in C++?
Ans. 
Smart pointers in C++ are objects that act like pointers but provide automatic memory management.
• Smart pointers help prevent memory leaks by automatically managing memory allocation and deallocation.

• Examples include unique_ptr, shared_ptr, and weak_ptr.

• unique_ptr is used for exclusive ownership, shared_ptr for shared ownership, and weak_ptr to prevent circular references.
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Q3. What is mutual exclusion in the context of concurrent programming?
Ans. 
Mutual exclusion is a concept in concurrent programming where only one thread can access a shared resource at a time.
• Ensures that only one thread can access a critical section of code at a time

• Prevents race conditions and data corruption

• Commonly implemented using locks, semaphores, or mutexes

• Example: Using a mutex to protect a shared variable in a multi-threaded application
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Q4. What is the process for implementing multithreading?
Ans. 
Implementing multithreading involves creating and managing multiple threads to execute tasks concurrently.
• Identify the tasks that can be executed concurrently

• Create and manage multiple threads to execute these tasks simultaneously

• Use synchronization techniques like locks and semaphores to prevent race conditions

• Handle communication and coordination between threads

• Consider thread safety and resource sharing issues
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Round duration - 90 Minutes
Round difficulty - Medium

The first round was scheduled in the evening time.
First of all interviewer introduced himself and after my introduction 
He directly shoot first DSA question. The question was easy but conceptual. I have solved some question with same concept and he ask me to share the screen and code in online compiler. Finally I was able to get correct output with all the use cases and I was like "Half work done!"
Then he asked me very core concepts of JavaScript along with that Some Output based questions.
Then finally he asked me theory questions on React along with my experience in React. 
The interviewer was very helpful as well as polite. I don't think if he will not help me during interview I could crack the interview

Q1. 
Is the Sentence a Pangram?
Ninja is relocating to a place called NinjaGram, and for school admission, he is required to identify if a given sentence is a pangram. Your task is to assist Ninja in determini...read more
Ans. 
Yes, the sentence is a pangram if it includes every letter of the English alphabet at least once.
• Check if the sentence contains all 26 letters of the English alphabet.

• Convert the sentence to lowercase to simplify the checking process.

• Use a set to keep track of the letters present in the sentence.

• Iterate through the sentence and add each unique letter to the set.

• After iterating, check if the set contains all 26 letters.
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Questions based or percentage, profit loss, ratio

Q1. Explain about stacks
Ans. 
Stacks are a data structure that follows the Last In First Out (LIFO) principle.
• Elements are added and removed from the top of the stack

• Common operations include push (add element) and pop (remove element)

• Stacks can be implemented using arrays or linked lists

• Examples of stack usage include function call stack and undo/redo functionality in text editors
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Q2. To find middle number in the linked list
Ans. 
To find the middle number in a linked list.
• Traverse the linked list using two pointers, one moving twice as fast as the other.

• When the fast pointer reaches the end, the slow pointer will be at the middle node.

• If the linked list has even number of nodes, there will be two middle nodes. Return either one.
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Q1. Introduction , hobbies, goals
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Q2. Strength, weakness, short term and long term goals
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Q1. Write a program to check if string is a anagram
Ans. 
Program to check if a string is an anagram
• Create a function that takes in two strings as input

• Remove all spaces and convert both strings to lowercase

• Sort both strings and compare if they are equal to determine if they are anagrams
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Q2. What is react lifecycle method
Ans. 
React lifecycle methods are special methods that are automatically called by React at specific points in a component's life cycle.
• React components have several lifecycle methods such as componentDidMount, componentDidUpdate, componentWillUnmount, etc.

• These methods allow developers to perform actions at specific points in a component's life cycle, such as fetching data, updating the UI, or cleaning up resources.

• Understa...read more
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Create a web app to perform cred operation

General aptitude questions

Abstract topic group discussion

Q1. Technical interview covering topics on oops , data structures , conditional statements.
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Q1. General questions- introduction , how previous rounds went ,hobbies , what do you know about our company , situation based questions.
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Few questions that would involve problem solving. Basic 10th std math would suffice

Had few DSA questions.

Q1. Technical interview
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Q1. About job, expection etc
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Simple question on maths

Q1. Explain OOPS concept
Ans. 
OOPS (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.
• OOPS focuses on creating objects that interact with each other to solve complex problems

• Key principles include encapsulation, inheritance, polymorphism, and abstraction

• Encapsulation ensures that the internal state of an object is hidden from the outside world

• Inheritance allows a class to inherit...read more
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Q2. Coding array questions
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Q1. Oops concept Js related output questions
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