World of Node.JS
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Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. It allows JavaScript to be run on the server-side and uses asynchronous and event-driven programming. Node.js uses non-blocking I/O to make it efficient for data-intensive real-time applications that run across distributed devices. It has a large community and ecosystem of open source libraries. While single-threaded, it allows for high concurrency through asynchronous and event-driven programming without threads.
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Table of Contents
Node.js: Why and Where to Use It?
How to Run Code in Node.js?
Why Node Js is single-threaded?
What is Non-blocking or asynchronous?
What is Blocking or synchronous?
What is IO?
Blocking vs Non Blocking NodeJS
Blocking or Non-blocking in Node.js: Which is Faster?
Dangers of Mixing Blocking and Non-Blocking Code
How can We Convert Blocking Code to Non-blocking Code?
Pros and Cons of Non Blocking IO Node.js
Is it possible to use asynchronous architecture?
Node.js: Why and Where to Use It?
Node.js has gained immense popularity in recent years due to its unique features and capabilities. It is a powerful JavaScript runtime built on Chrome’s V8 JavaScript engine, which enables developers to build scalable and high-performance applications. In this article, we will explore the reasons why you should consider using Node.js and where it can be most beneficial.
Why to Use Node.js?
Efficient and Scalable:
Node.js is known for its efficiency and scalability, making it an excellent choice for developing applications that can handle a large number of concurrent connections. It uses an event-driven, non-blocking I/O model, allowing it to handle multiple requests without getting blocked, unlike traditional blocking I/O models used in other languages. This makes Node.js ideal for applications that require real-time interactions, such as chat applications, collaborative tools, and gaming platforms.
Single Language, Full Stack:
One significant advantage of Node.js is that it enables developers to use JavaScript both on the server and the client side. This means that you can have a seamless development experience, using the same language and libraries throughout the entire stack. This consistency reduces the complexity of development and eases the transition between front-end and back-end development tasks. It also enables the reuse of code and modules, resulting in faster development cycles and increased productivity.
Large and Active Community:
Node.js has a vibrant and extensive community of developers, which means you can easily find support, libraries, and resources to help you in your Node.js development journey. The community actively contributes to the Node Package Manager (NPM), which hosts a vast collection of open-source packages that can be easily integrated into your projects. With a rich ecosystem and continuous community-driven enhancements, Node.js ensures that you can find solutions to most of your development challenges.
Where to Use Node.js?
High Performance:
Node.js’s event-driven, non-blocking architecture allows it to handle a large number of concurrent connections efficiently. This, coupled with its ability
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- 3. Why JavaScript mattersLarge pool of programmersLarge corporations throw a lot of money at making it more efficient. V8 (in Google Chrome) is one of the fastest dynamic engines. Universal language (every web programmer knows it - ruby, python, php etc.)
- 4. Node.JSIt is a set of non-blocking APIs for the OS, built on top of V8 interpreter.It is a command line tool, mostly for Linux. You download a tarball, compile and install the source.It let's you run JavaScript programs by typing 'node my_app.js' in your terminal.HTTP/S is a first-class citizen. CommonJS module system.
- 5. Asynchronous, Event-basedJavaScript is single threadedEverything runs in parallel, except your code.You don't have to worry about code accessing the same data structures at the same time.Node.JS uses async mechanisms of the underlying OS (epoll, libeio)It’s natural to write it in JS (closures, etc).
- 6. Hello world using Node.js
- 7. Why it’s goodIt’s JavaScript – mentioned before + Code reuse (shared codebase with client side)Modern, unified languageCommonJS module system Large, easily accessible library of modules
- 8. Why it’s goodEfficiency (time+memory): no thread switching/process switching costs + epoll + libev + libeioConceptually easier - no multithreading issues.Massive concurrency.
- 10. Fast development paceLarge active community 1754 packages/libraries in popular package manager~150 coders in Russia
- 11. AlternativesPython: Twisted, TornadoErlang: erlycometRuby: EventMachinePerl: POEJava: JBossNetty (based on java.nio)
- 12. Most notable modulesnpm: packagerconnect/express/ejs/jade/stylus: web stacksocket.io: real-time communication with browser (WebSockets, etc)coffee-script: JavaScript 2.0jsdom+vows+zombie: Unit tests + browser emulation
- 13. Socket.IOLibrary to simplify implementation of realtime communication with different browsers.WebSocketsFlashLong pollingPollingUsers don’t need to know about it.A lot of connections can be kept due to Node.
- 14. Unsolved problemsNo complete easy, standard solution for serversSingle thread -> single core. No standard solution for CPU-intensive tasks.