Blue Yonder React Js Frontend Developer Interview Questions and Answers

Medium data structure problem was given and asked to solve. System design questions was asked.

Medium data structure problem was asked. Java questions were asked and previous projects were discussed.

Q1. System Design question was asked. Java concepts were asked.
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Q2. Java Concepts were asked.
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Q3. Previous projects were discussed.
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Q1. Previous projects were discussed. Roles and responsibilities were discussed.
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Q1. All about react
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Q1. What is the purpose of using a constant reference in a copy constructor in C++?
Ans. 
Using a constant reference in a copy constructor avoids unnecessary copying and ensures the original object remains unchanged.
• Efficiency: Passing by constant reference prevents the overhead of copying large objects, improving performance.

• Const Correctness: It ensures that the original object cannot be modified, maintaining the integrity of the data.

• Syntax Example: In a copy constructor, you might see 'ClassName(const C...read more
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Q2. What is the mechanism of runtime polymorphism?
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Runtime polymorphism allows methods to be invoked at runtime based on the object's type, enabling dynamic method resolution.
• Achieved through method overriding in inheritance.

• Example: A base class 'Animal' has a method 'sound()', overridden by 'Dog' and 'Cat'.

• The method invoked depends on the object type at runtime.

• Facilitates code flexibility and reusability.

• Commonly used in frameworks and libraries for dynamic behavio...read more
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Q3. What is the process for creating a custom string class using char* in coding?
Ans. 
Creating a custom string class using char* involves managing memory, constructors, destructors, and operator overloading.
• Memory Management: Use dynamic memory allocation (e.g., new and delete) to manage the char* array, ensuring proper allocation and deallocation.

• Constructor: Implement a constructor to initialize the string from a char* input, copying the content and allocating necessary memory.

• Destructor: Define a des...read more
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Q4. What is the minimum number of weighings required to identify the person with a different weight among nine individuals, where eight have equal weight and one has a different weight, using a balance scale?
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Q5. What is the method for projecting one vector onto another vector?
Ans. 
Vector projection involves calculating the component of one vector along another using dot products.
• The formula for projecting vector A onto vector B is: proj_B(A) = (A · B / B · B) * B.

• Here, A · B represents the dot product of vectors A and B.

• The result is a vector that points in the direction of B and has a magnitude equal to the component of A in that direction.

• Example: If A = (3, 4) and B = (1, 0), then proj_B(A) =...read more
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Q6. Given the product of the ages of two individuals is a certain number and both individuals are eligible to vote, how can one determine the ages of each individual?
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Q1. Core deep concepts of c++ and few basic coding questions
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Q1. Reverse a string without any library function.
Ans. 
Reverse a string without any library function.
• Create an empty string to store the reversed string

• Loop through the original string from end to start

• Append each character to the empty string

• Return the reversed string
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Q2. About current project and it's architecture. Challenges you've faced in current project and how did you've solved it. Basic of OOPS
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Q1. Personality check, tell me something about yourself which is not there in CV
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Round duration - 45 minutes
Round difficulty - Medium

Technical Interview round with questions on DSA.

Q1. 
Reverse Words in a String: Problem Statement
You are given a string of length N. Your task is to reverse the string word by word. The input may contain multiple spaces between words and may have leading o...read more
Ans. 
Reverse words in a string while handling leading, trailing, and multiple spaces.
• Split the input string by spaces to get individual words

• Reverse the order of the words

• Join the reversed words with a single space in between

• Handle leading, trailing, and multiple spaces appropriately
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Q2. 
Reverse a Stack Using Recursion
You are given a stack of integers. Your task is to reverse the stack using recursion without using any extra space other than the internal stack space used due to recursion...read more
Ans. 
Reverse a stack using recursion without using any extra space other than the internal stack space.
• Use recursion to pop all elements from the original stack and store them in function call stack.

• Once the stack is empty, push the elements back in reverse order.

• Base case of recursion should be when the original stack is empty.
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Round duration - 45 minutes
Round difficulty - Medium

Technical Interview round with questions on DSA.

Q1. 
Convert a Binary Tree to its Mirror Tree
Given a binary tree, convert this binary tree into its mirror tree. A binary tree is a tree in which each parent node has at most two children. The mirror of a bin...read more
Ans. 
Convert a binary tree to its mirror tree by interchanging left and right children of all non-leaf nodes.
• Traverse the binary tree in a recursive manner.

• Swap the left and right children of each non-leaf node.

• Continue this process until all nodes have been processed.
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Q2. 
Remove Nth Node from End of Linked List
You are given a singly linked list with 'N' nodes, each containing integer data, and an integer 'K'. Your goal is to remove the 'K'th node counting from the end of ...read more
Ans. 
Remove the Kth node from the end of a singly linked list.
• Use two pointers approach to find the Kth node from the end.

• Handle edge cases like removing the head node or removing the last node.

• Update the pointers to remove the Kth node and reconnect the list.
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Round duration - 30 minutes
Round difficulty - Easy

Typical Managerial round.