Front-end Developer Interview Questions!

2. What is the purpose of a version control system, and can you name a popular one?

a. Version control systems like Git help developers track changes to their code, collaborate with others, and maintain a history of modifications. Git is one of the most popular version control systems, known for its distributed nature and efficiency.

3. Explain the concept of RESTful API?

a. REST stands for Representational State Transfer. RESTful APIs are a set of principles for designing networked applications, making it easier to communicate between different systems over the internet. They use standard HTTP methods like GET, POST, PUT, and DELETE to perform CRUD (Create, Read, Update, Delete) operations on resources. They are important for building scalable and maintainable web services.

4. What is a database index, and why is it important for database performance?

a. A database index is a data structure that improves the speed of data retrieval operations on a database table. It acts like a table of contents, allowing the database system to quickly locate specific data without scanning the entire table. Indexes significantly enhance query performance and are essential when dealing with large datasets.

5. What is functional programming in JavaScript?

a. In JavaScript, functional programming is a programming paradigm mainly designed to handle pure mathematical functions as it focuses on writing more compounded and pure functions. It is used in JavaScript as JavaScript is a multi-paradigm language. In JavaScript, we can easily mix a lot of different paradigms inside a simple piece of JavaScript code. We can use procedural, object-oriented, and functional programming paradigms simultaneously in JavaScript, which makes it more powerful.

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