Capgemini Engineering Interview Questions and Answers

Q1. What is closure
Ans. 
A closure is a function that has access to its own scope, as well as the scope in which it was defined.
• A closure allows a function to access variables from an outer function even after the outer function has finished executing.

• Closures are commonly used in event handlers, callbacks, and in functional programming.

• Example: const outerFunction = () => { const outerVar = 'I am outer'; return () => { console.log(outer...read more
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Q2. What is difference between state and props
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State is mutable and managed within a component, while props are immutable and passed from parent to child components.
• State is managed within a component and can be changed using setState() method

• Props are passed from parent to child components and cannot be changed within the child component

• State is used for internal component data management, while props are used for passing data from parent to child components

• Exampl...read more
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Q1. What is difference between display block and inline
Ans. 
display block takes up full width and starts on a new line, while display inline only takes up as much width as necessary and does not start on a new line.
• display block elements start on a new line and take up the full width available, while display inline elements do not start on a new line and only take up as much width as necessary

• display block elements can have margin and padding applied on all four sides, while di...read more
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Q2. What is promise
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A promise is an object representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

• A promise can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() to handle success and .catch() to handle errors.

• Example: Fetching data from an API returns a promise that resolves with the data or rejects with ...read more
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Good morning raise a simple terms of the following sentence to be ready to to to to to to to to

Q1. The following sentence to the sentence to be
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Q2. They you are not reachable at the same thing
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Q1. Can we interchange service and controller annotations?
Ans. 
No, service and controller annotations cannot be interchanged.
• Service annotations are used to define a class as a service component, while controller annotations are used to define a class as a controller component.

• Service annotations are typically used for business logic and data manipulation, while controller annotations are used for handling HTTP requests and responses.

• Interchanging these annotations can lead to une...read more
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Q2. Sql query join
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SQL joins combine rows from two or more tables based on related columns, enabling complex queries and data retrieval.
• INNER JOIN: Returns records with matching values in both tables. Example: SELECT * FROM A INNER JOIN B ON A.id = B.id;

• LEFT JOIN: Returns all records from the left table and matched records from the right table. Example: SELECT * FROM A LEFT JOIN B ON A.id = B.id;

• RIGHT JOIN: Returns all records from the r...read more
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Q1. Why want to switch?
Ans. 
Seeking new challenges and opportunities for growth in a different environment.
• Desire for new challenges and opportunities

• Seeking professional growth and development

• Interested in exploring different work environment

• Looking for a change in career path
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Q1. Hashmap internal working
Ans. 
HashMap in Java uses an array of buckets and linked lists to store key-value pairs efficiently.
• 1. Structure: HashMap uses an array of nodes (buckets) to store entries.

• 2. Hashing: Keys are hashed to determine their bucket index.

• 3. Collision Handling: If two keys hash to the same index, a linked list is used to store multiple entries.

• 4. Load Factor: Default load factor is 0.75, balancing space and time efficiency.

• 5. Resi...read more
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Q2. Default methods and multiple abstraction, asynchronous calls in java
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MCQ’s only, DSA and other MCQ 1 hour

Q1. Project related questions
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Discussing project experiences showcases skills, teamwork, and problem-solving abilities in software development.
• Describe the project goals and objectives, e.g., developing a mobile app for health tracking.

• Explain your role and contributions, such as coding, testing, or leading a team.

• Highlight challenges faced and how you overcame them, like debugging complex issues.

• Mention technologies used, e.g., React for frontend ...read more
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Q2. Coding problem in any basic programming language
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Q1. General HR and salary discussions
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Q2. Location and other related queries
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Easy and gaming round also included which has more weightage

Q1. Tell me about yourself
Ans. 
I am a passionate engineer with a strong background in software development and a keen interest in innovative technology solutions.
• Graduated with a degree in Computer Engineering from XYZ University, where I developed a solid foundation in programming and systems design.

• Interned at ABC Corp, where I contributed to a team project that improved application performance by 30% through code optimization.

• Proficient in langua...read more
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Q2. What four pillar of oops
Ans. 
The four pillars of OOP are encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Inheritance: Allowing a class to inherit properties and behavior from another class.

• Polymorphism: The ability for objects of different classes to respond to the same message.

• Abstraction: Hiding the complex implementation details and showing only the n...read more
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