Dev Information Technology Reactjs Developer Interview Questions and Answers

Q1. Introduce yourself
Ans. 
I am a software developer with 5 years of experience in Java, Python, and SQL.
• 5 years of experience in Java, Python, and SQL

• Strong problem-solving skills

• Experience working in Agile development environment
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Q2. What is React and react native
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React is a JavaScript library for building user interfaces, while React Native is a framework for building mobile applications using React.
• React is a JavaScript library developed by Facebook for building interactive user interfaces.

• React Native is a framework that allows developers to build mobile applications using React.

• React uses a virtual DOM to improve performance by updating only the necessary components.

• React Na...read more
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Q1. About yourself and background only
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I applied in campus placement first round is aptitude test

Q1. Ask question on oops concepts
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Q2. What ia polymorphism Pointers etc.
Ans. 
Polymorphism is the ability of a function or method to behave differently based on the object it is called with.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Animal class with methods eat() and sleep(). Dog and Cat classes can inherit from Animal and override
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Q3. Asked about academic project what is your role on these project
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Q4. Based on resume asked questions and mostly asked the oops and c++ concept
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Q1. Based on resume and asked weakness ,strength
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Some questions about specific puthon types etc...

Q1. Why i want to move on
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Q2. What i like at my future job
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Skilled Based Test Done

Programming Language Test

Q1. Based on skills
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Q2. Based on experience
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I was given a problem statement and was asked to give a LLD and solution implementation and share it on Git.

Q1. Explain the LLD submitted.
Ans. 
The LLD submitted is a detailed design document outlining the architecture and implementation details of the software solution.
• LLD stands for Low Level Design and includes detailed design diagrams, data structures, algorithms, and component interactions.

• The LLD submitted should provide a clear roadmap for developers to implement the software solution based on the high-level design.

• It should cover all aspects of the sof...read more
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Q2. How to add more features in the solution
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To add more features in the solution, consider user feedback, market trends, and technical feasibility.
• Gather user feedback to understand what features are desired

• Research market trends to identify popular features

• Assess technical feasibility to determine if new features can be implemented

• Prioritize features based on impact and resources available
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Q3. SOLID principles, Degin patterns
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Q1. This was a manegerial round.
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Q1. Salary discussion
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Round duration - 90 minutes
Round difficulty - Medium

Q1. 
Cycle Detection in a Singly Linked List
Determine if a given singly linked list of integers forms a cycle or not.
A cycle in a linked list occurs when a node's next points back to a previous node in the ...read more
Ans. 
The task is to determine if a given singly linked list forms a cycle or not.
• A cycle occurs when a node's next points back to a previous node in the list.

• To solve this problem, we can use the Floyd's Cycle-Finding Algorithm.

• The algorithm uses two pointers, one moving at a normal pace and the other moving twice as fast.

• If there is a cycle, the fast pointer will eventually catch up to the slow pointer.

• If the fast pointer ...read more
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Round duration - 60 minutes
Round difficulty - Medium

Q1. 
Minimum Depth of a Binary Tree
Determine the minimum depth of an integer-based binary tree. The minimum depth is defined as the number of nodes present along the shortest path from the root node down to t...read more
Ans. 
The minimum depth of a binary tree is the number of nodes along the shortest path from the root node down to the nearest leaf node.
• The minimum depth can be found by performing a breadth-first search (BFS) traversal of the binary tree

• During the BFS traversal, keep track of the current level and increment the depth by 1 for each level

• Stop the BFS traversal when a leaf node is encountered and return the depth as the minim
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Q2. 
Intersection of Two Arrays Problem Statement
Given two arrays A and B with sizes N and M respectively, both sorted in non-decreasing order, determine their intersection.
The intersection of two arrays in...read more
Ans. 
The problem is to find the intersection of two sorted arrays.
• Use two pointers to iterate through the arrays.

• Compare the elements at the current pointers and move the pointers accordingly.

• If the elements are equal, add it to the intersection array and move both pointers.

• If the element in the first array is smaller, move the first pointer.

• If the element in the second array is smaller, move the second pointer.

• Repeat until...read more
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Q3. What is the difference between a mutex and a semaphore?
Ans. 
A mutex is a binary semaphore used for mutual exclusion, while a semaphore is a generalized synchronization primitive.
• Mutex is used to protect a critical section of code, allowing only one thread to access it at a time.

• Semaphore is used to control access to a shared resource, allowing multiple threads to access it simultaneously.

• Mutex has ownership, meaning the thread that locks it must unlock it.

• Semaphore does not hav...read more
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Round duration - 60 minutes
Round difficulty - Easy

Round duration - 25 minutes
Round difficulty - Easy