Node js tutorial step by step 4 References And === Video Lecture | The Complete NodeJS Developer Course (in Hindi) - Back-End Programming

Ans. Node.js is a JavaScript runtime environment that allows developers to run JavaScript on the server-side. It is widely used in back-end programming because it offers several advantages such as scalability, high performance, and the ability to handle a large number of concurrent connections. Node.js also allows developers to build real-time applications, handle data-intensive tasks efficiently, and easily share code between the server and the client.

Ans. Node.js uses a single-threaded, event-driven architecture to handle asynchronous operations. It employs an event loop that continuously checks for pending events and executes the associated callbacks when an event occurs. This non-blocking I/O model allows Node.js to handle multiple concurrent operations efficiently without blocking the execution of other code. As a result, Node.js is particularly well-suited for building highly scalable and performance-driven applications.

Ans. Some advantages of using Node.js for back-end programming include: - Fast and efficient: Node.js is built on the V8 JavaScript engine, which is known for its speed and performance. It allows developers to handle a large number of concurrent connections without consuming excessive resources. - JavaScript everywhere: Node.js uses JavaScript as its primary language, which makes it easy for developers to share code between the server and the client. This enables a more streamlined and efficient development process. - Event-driven architecture: Node.js follows an event-driven, non-blocking I/O model, allowing it to handle asynchronous operations efficiently. This makes it suitable for building real-time applications and handling data-intensive tasks. - Large ecosystem and community: Node.js has a vast ecosystem of open-source libraries and modules, making it easy for developers to find and implement additional functionalities in their applications. It also has a large and active community that provides support and regularly updates the platform.

Ans. While Node.js offers many advantages, it also has some limitations and drawbacks. These include: - Single-threaded: Since Node.js runs on a single thread, it may not be the best choice for CPU-intensive tasks that require parallel processing. Such tasks can block the event loop and impact the overall performance of the application. - Code execution order: In some cases, the asynchronous nature of Node.js can lead to complex code execution order, making it harder to manage and debug. Developers need to be careful and handle asynchronous operations properly to avoid any unexpected behavior. - Stability: Node.js is relatively new compared to other back-end technologies, which may lead to some stability issues. It is important to ensure that the chosen libraries and modules are well-maintained and have a stable release. - Learning curve: Although JavaScript is a widely-used language, some developers may still need to learn new concepts and patterns when transitioning to Node.js. This learning curve can be a challenge for those who are not familiar with event-driven programming or asynchronous operations.

Ans. Node.js handles concurrency in back-end programming by utilizing an event-driven, non-blocking I/O model. Instead of creating a new thread for each incoming request, Node.js uses a single thread to handle multiple concurrent connections. It does this by relying on callbacks and event-driven programming, allowing it to efficiently process requests without blocking the execution of other code. When a request is received, Node.js registers a callback function and continues to process other requests. Once the I/O operation is complete, Node.js triggers the corresponding callback, allowing the application to continue with the associated task. This approach eliminates the need for blocking I/O operations, resulting in better performance and scalability for applications.