Complex SPAs (Single-Page Applications)ġ0.Node.js is widely used in the following applications: The medium can be a physical device, network, or files within a system Every transfer is an output from one medium and an input into another.The term I/O is used to describe any program, operation, or device that transfers data to or from a medium and to or from another medium.The control flow of asynchronous logic is more specified and structured.What are the advantages of using promises instead of callbacks? All APIs of Node are written to support callbacks. Being an asynchronous platform, Node.js heavily relies on callback. It allows other code to be run in the meantime and prevents any blocking. Explain callback in Node.js.Ī callback function is called after a given task. The event loop is the processing model's beating heart in Node.js. As a result, Node.js can easily manage more concurrent client requests. The Node JS Processing paradigm is heavily influenced by the JavaScript Event-based model and the JavaScript callback system. The Multi-Threaded Request/Response Stateless Model is not followed by the Node JS Platform, and it adheres to the Single-Threaded Event Loop Model. If Node.js is single-threaded, then how does it handle concurrency? By doing async processing on a single-thread under typical web loads, more performance and scalability can be achieved instead of the typical thread-based implementation. Node.js is single-threaded for async processing. Once the task is carried out completely, the response is sent to the Event Loop that sends that response back to the client. This thread is responsible for completing a particular blocking request by accessing external resources, such as computation, database, file system, etc. The Event Loop processes simple requests (non-blocking operations), such as I/O Polling, and returns the responses to the corresponding clientsĪ single thread from the Thread Pool is assigned to a single complex request.It checks if the requests are simple enough not to require any external resources The requests are then passed one-by-one through the Event Loop.Node.js retrieves the incoming requests and adds those to the Event Queue.Requests can be non-blocking or blocking: Clients send requests to the webserver to interact with the web application.Let’s explore this flow of operations in detail. It offers a unified programming language and data typeĪ web server using Node.js typically has a workflow that is quite similar to the diagram illustrated below.Node.js makes building scalable network programs easy. You can also use it for developing: Real-time web applications, Network applications, General-purpose applications, and Distributed systems. You can use I/O intensive web applications like video streaming sites. Node.js is perfect for data-intensive applications as it uses an asynchronous, event-driven model. It is used to create server-side web applications. Node.js is an open-source, cross-platform JavaScript runtime environment and library to run web applications outside the client’s browser. This section will provide you with the Basic Node.js interview questions which will primarily help freshers. Node.js Interview Questions and Answers For Freshers
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