Blue Yonder React Js Frontend Developer Interview Questions and Answers

Be good on basics of coding

Q1. Some sql queries and code piece related to substring
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Q1. All about react
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MCQs and coding problems
duration - 1Hr 30min

Q1. Which 2 methods must an object implement in order to be used as a key in hasmap and why
Ans. 
The object must implement the hashCode() and equals() methods to be used as a key in a hashmap.
• hashCode() method is used to generate a unique hash code for the object.

• equals() method is used to compare two objects for equality.

• Both methods are necessary for proper functioning of hashmap operations like put() and get().
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Q2. Is it preferable to use stringBuffer with its synchronized methods or stringBuilder when implementing toString() method? why?
Ans. 
Use stringBuilder for toString() method as it is faster and not thread-safe.
• stringBuilder is faster than stringBuffer as it is not thread-safe

• toString() method is used for converting an object to a string

• If thread-safety is required, use stringBuffer instead

• Example: StringBuilder sb = new StringBuilder(); sb.append("Hello"); sb.append("World"); return sb.toString();
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Q3. What are 2 checklists to be executed for overriding object.equals(object args) for a class with only one instance variable
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Q4. Is it good idea to wrap java.io.FileInputStream and java.io.FileOutputStream in buffered writers and readers and why?
Ans. 
Yes, it is a good idea to wrap FileInputStream and FileOutputStream in buffered writers and readers.
• Buffered streams improve performance by reducing the number of I/O operations

• Buffered streams also provide additional functionality like readLine() and newLine()

• Buffered streams can be chained together for even better performance

• Example: BufferedReader br = new BufferedReader(new FileReader(file));
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Screening of profile based on prior experience

Develop the process for cyberdefense

Group discussion with Manager and VP

Explain the profile and develop the cases that you have proposed for clearing this interview

Discussion on assignments that has been solved till now

Q1. Discussion on salary and family background
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Q1. Managerial round to know how a canal did are handles or manages team
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Q2. Discussion about your next steps to grow in IT carrier
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Q3. Discussion about how do you grow your carrier in building this society
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Q4. How much salary do you expect from this company
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Q1. Technical knowledge on the profile that was assigned by HR
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Q1. Technical HR to handle the candidate knowledge and provide necessary growth to candidate based on the profile on knowledge the candidate carries
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Q1. Salary and Final discussion with HR and Manager.
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Q1. Explain how CLR works
Ans. 
CLR is the runtime environment for .NET applications that manages memory, security, and execution of code.
• CLR stands for Common Language Runtime

• It compiles code into an intermediate language (IL) that can run on any platform with CLR installed

• CLR manages memory through garbage collection

• It provides security through code access security (CAS)

• CLR also includes just-in-time (JIT) compilation for improved performance
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Q2. Explain SOLID principle
Ans. 
SOLID is a set of principles for object-oriented programming that aims to make software more maintainable, scalable, and robust.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Subtypes should be substitutable for their base types.

• I - Interface Segreg...read more
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Q3. Explain design pattern
Ans. 
Design pattern is a reusable solution to a commonly occurring problem in software design.
• Design patterns provide a common language for developers to communicate solutions.

• They help in creating flexible, maintainable, and scalable software.

• Examples include Singleton, Factory, Observer, and MVC pattern.

• Design patterns are categorized into three types: Creational, Structural, and Behavioral.
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Q4. Write a program for palindrome
Ans. 
Program to check if a given string is a palindrome
• Convert the string to lowercase to ignore case sensitivity

• Remove all non-alphanumeric characters from the string

• Reverse the string and compare it with the original string

• If they are the same, then the string is a palindrome
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Q1. Function overloading vs overriding
Ans. 
Function overloading is having multiple functions with the same name but different parameters. Function overriding is having a function in a subclass with the same name and parameters as a function in the superclass.
• Function overloading is used to provide different ways to call a function with different parameters.

• Function overriding is used to provide a specific implementation of a function in a subclass that is diffe...read more
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Q2. Difference between ref and out
Ans. 
Ref and out are both used to pass arguments by reference in C#. Ref is bidirectional while out is unidirectional.
• Ref and out are used to pass arguments by reference instead of by value

• Ref is used for both input and output parameters while out is only used for output parameters

• Ref requires the variable to be initialized before passing while out does not

• Example: void MyMethod(ref int x) { x = x + 1; }

• Example: void MyMeth
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Q3. Explain jagged array in C#
Ans. 
Jagged array is an array of arrays where each array can have different lengths.
• Each array can have different number of elements

• Can be used to represent tables with varying number of columns

• Example: string[][] jaggedArray = new string[3][];
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Q4. How does IIS work internally
Ans. 
IIS is a web server that handles HTTP requests and responses.
• IIS stands for Internet Information Services.

• It is a component of Windows Server.

• It listens for incoming HTTP requests on a specified port.

• It processes the request and sends back a response.

• It can host multiple websites on a single server.

• It supports various protocols like HTTP, HTTPS, FTP, SMTP, etc.

• It can be configured using the IIS Manager tool.

• It can also
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Q1. Why do you want to join Oracle ?
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Q2. What is your greatest weakness ?
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Q1. Compensation discussion.
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Q1. 2 tech rounds 1 tech plus managerial Then final call with HR
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Q1. Technical Interview based on you experience.
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Q2. Logical questions related to the real world problem solving
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Q1. Pure technical on working technologies
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Q2. Basic to in depth technical questions
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Q1. Your responsibilities in the project
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Q2. Achievements in your work
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Q1. Technical questions and achievements
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Q2. Strengths, weaknesses and project structure
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Q1. Salary discussion and position information
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Q2. Salary negotiations and information on position
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Round duration - 60 minutes
Round difficulty - Easy

This was a 60 minute technical round involving questions based on data structures, OOPS concepts, DBMS and projects that I had mentioned in my resume.

Q1. 
Nth Fibonacci Number Problem Statement
Calculate the Nth term in the Fibonacci sequence, where the sequence is defined as follows: F(n) = F(n-1) + F(n-2), with initial conditions F(1) = F(2) = 1.
Input:
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Ans. 
Calculate the Nth Fibonacci number efficiently using recursion or dynamic programming.
• Implement a recursive function to calculate the Nth Fibonacci number.

• Use memoization to store previously calculated Fibonacci numbers for efficiency.

• Consider using dynamic programming to optimize the solution.

• Handle edge cases such as N = 1 or N = 2 separately.

• Ensure the solution works efficiently for large values of N (up to 10000).
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Q2. Can you provide a program demonstrating operator overloading in OOP?
Ans. 
Operator overloading in OOP allows custom behavior for operators like +, -, *, etc.
• Operator overloading is a feature in OOP that allows defining custom behavior for operators

• Example: Overloading the + operator to concatenate strings or add two numbers

• Example: Overloading the * operator to perform matrix multiplication
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Q3. What is function overloading?
Ans. 
Function overloading is when multiple functions have the same name but different parameters or return types.
• Allows multiple functions with the same name but different parameters or return types

• Helps improve code readability and maintainability

• Example: int add(int a, int b) and float add(float a, float b)
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Q4. What are the differences between C and C++?
Ans. 
C is a procedural programming language while C++ is a multi-paradigm programming language with object-oriented features.
• C is a procedural programming language while C++ supports both procedural and object-oriented programming.

• C does not support classes and objects while C++ does.

• C does not have built-in support for exception handling while C++ does.

• C does not have namespaces while C++ does.

• C does not have function over
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Round duration - 45 minutes
Round difficulty - Easy

HR round that lasted for 45 minutes. Did brainstorming on puzzles and HR asked questions to know more about me.
Tips : During HR, think before you speak, they can catch any word that you speak. Prepare well for aptitude, as they shortlist less people after the test. Ask good questions during the end of the interviews. It might impress them. So prepare for it before going for the interview. Lastly, don’t be nervous, HRs are only trying to make you nervous during the interview as a part of the stress test.

Q1. How can you measure 45 minutes using two identical wires?
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