Visteon Interview Questions and Answers

Sync and async refer to synchronous and asynchronous programming, respectively.

• Sync programming executes tasks sequentially, blocking the program until each task is completed.

• Async programming allows tasks to run concurrently, enabling the program to continue executing other tasks while waiting for asynchronous tasks to complete.

• Examples of sync programming include traditional function calls, while async programming often involves callbacks, promises, or async/await syntax.

Identifying memory leaks involves monitoring memory usage, analyzing memory dumps, and using tools like Valgrind.

• Monitor memory usage over time to detect abnormal increases.

• Analyze memory dumps to identify the source of the leak.

• Use tools like Valgrind to detect memory leaks in C/C++ programs.

• Check for unreleased resources such as file handles or database connections.

SOLID Principles are a set of five design principles in object-oriented programming to make software designs more understandable, flexible, and maintainable.

• 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: Objects of a superclass should be replaceable with objects of its subclasses without affecting the func...read more

Oops concepts are the principles of Object-Oriented Programming, including Inheritance, Encapsulation, Polymorphism, and Abstraction.

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

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and showing only the necessary features.

Optimizing SQL queries can improve performance. Use indexes, limit results, and optimize joins.

• Use indexes to speed up data retrieval

• Limit results to only necessary data

• Optimize joins by using appropriate join types and conditions

• Avoid using SELECT * and instead specify only necessary columns

• Avoid using subqueries if possible

• Use EXPLAIN to analyze query performance

React hooks are functions that allow you to use state and other React features without writing a class.

• Introduced in React 16.8

• Used to manage state and lifecycle methods in functional components

• useState() is the most commonly used hook for managing state

• useEffect() is used for handling side effects

• useContext() is used for consuming context

• useReducer() is used for managing complex state logic

• Custom hooks can be created to reuse stateful logic across components