Walmart Software Engineer Interview Questions and Answers for Freshers

Q1. Questions about JavaScript and React
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Usually they judge on basis of your behaviour and attitude.

Q1. Discussion about the CTC
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Two DSA ques were asked. One easy and one medium.

Q1. Project discussion and some DSA ques
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Q1. Standard hr question
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Q1. Internals of hashset
Ans. 
HashSet is a collection that stores unique elements using a hash table.
• Uses hashing to store elements

• Does not allow duplicate elements

• Provides constant-time performance for basic operations like add, remove, contains
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Q2. Deques based questions
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Q1. Projects discussion from beginning
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Q2. How do you resolve conflicts?
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I resolve conflicts by actively listening, understanding all perspectives, finding common ground, and proposing solutions.
• Actively listen to all parties involved

• Understand each perspective and the underlying reasons for conflict

• Find common ground and areas of agreement

• Propose solutions that address the concerns of all parties
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Q1. What is the difference between virtual and real DOM?
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Virtual DOM is a lightweight copy of the real DOM, used for efficient updates.
• Real DOM updates are slow and expensive, while virtual DOM updates are fast and efficient.

• Virtual DOM is used in React to update the UI without reloading the entire page.

• Real DOM is the actual HTML document, while virtual DOM is a JavaScript object.

• Virtual DOM compares the previous and current states of the UI to determine the minimum number ...read more
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Q2. What is the difference between var, let and const?
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var is function scoped, let and const are block scoped. var can be redeclared and reassigned, let can be reassigned but not redeclared, const cannot be reassigned or redeclared.
• var is hoisted to the top of the function, let and const are not

• var can be redeclared within the same scope, let and const cannot

• let and const have a temporal dead zone where they cannot be accessed before they are declared

• const cannot be reassi...read more
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Q1. Optimization techniques in React.
Ans. 
Optimization techniques in React include code splitting, lazy loading, and memoization.
• Code splitting: breaking down the code into smaller chunks to reduce load time.

• Lazy loading: loading components only when they are needed, reducing initial load time.

• Memoization: caching the results of expensive function calls to improve performance.

• Using shouldComponentUpdate to prevent unnecessary re-renders.

• Using React.PureCompone...read more
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Q2. All about flexbox modal in CSS.
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Q1. Agile methodology and your previous projects
Ans. 
I have experience working with Agile methodology in my previous projects.
• I have worked in Scrum and Kanban frameworks.

• I have experience in conducting daily stand-up meetings, sprint planning, and retrospectives.

• I have worked in cross-functional teams and have experience in collaborating with product owners and stakeholders.

• I have used tools like Jira and Trello to manage tasks and track progress.

• In one of my previous p...read more
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Q1. Immutable Class, Remove duplicates from string using java 8
Ans. 
Immutable class, remove duplicates from string using Java 8
• Create an immutable class to represent the string

• Use Java 8 streams to remove duplicates from the string

• Convert the string to a character array, use distinct() and collect() to remove duplicates
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Q2. Sealed classes in java
Ans. 
Sealed classes in Java restrict inheritance to a predefined set of subclasses.
• Sealed classes were introduced in Java 15 to restrict inheritance to a predefined set of subclasses.

• Subclasses of a sealed class must be declared in the same file as the sealed class.

• Sealed classes are declared using the 'sealed' modifier before the 'class' keyword.

• Example: sealed class Shape permits Circle, Square, Triangle;
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Q1. Fallout Mechanism between the microservices
Ans. 
Fallout mechanism between microservices refers to how failures in one microservice can impact other microservices.
• Fallout can occur due to cascading failures when one microservice depends on another.

• Implementing circuit breakers can help prevent fallout by isolating failures.

• Monitoring and alerting systems are crucial for detecting and responding to fallout.

• Using asynchronous communication can reduce the impact of fall...read more
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Q1. Java tricky question related to collections
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Q1. HLD discussion related to current project
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Q1. Questions about JavaScript, different types of DataTypes,
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Q2. Write code to add elements dynamically
Ans. 
Adding elements dynamically to an array in code
• Use push() method to add elements to an array in JavaScript

• In Python, use append() method to add elements to a list

• In Java, use ArrayList and add() method to dynamically add elements
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Q3. What is Hoisting
Ans. 
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope.
• Variable and function declarations are hoisted to the top of their scope during the compilation phase.

• Only the declarations are hoisted, not the initializations.

• Function declarations take precedence over variable declarations when hoisted.
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Q1. Current CTC, Experience
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Q2. What is expected CTC
Ans. 
Expected CTC should be based on industry standards, experience, skills, and location.
• Research industry standards for Software Engineer salaries

• Consider your experience level and skills when determining expected CTC

• Take into account the cost of living in the location of the job

• Negotiate based on the job responsibilities and market demand
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