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 is used for building scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, as it can handle multiple connections simultaneously without blocking. Many popular web servers and applications are built with Node.js.
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Difference between Node.js vs Java scriptGhulamHussain799241 An interpreted, cross-platform, and lightweight client-side scripting language is called JavaScript. Java and HTML are both present. Burraq IT Solutions is an IT institute offering Node.js training in Lahore, Pakistan. Node.js is an open-source, cross-platform, server-side JavaScript courses runtime environment built on Google Chrome’s V8 JavaScript engine. IN contrast, Node.js is a V8-based server-side programming language. It's employed to create network-centric apps as a result. It is a network system designed for real-time, data-intensive applications. It is evident from a comparison between node js vs python that node js will always be the better choice.
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ProposalConstantine Priemski Node.js is a server-side JavaScript platform that allows building scalable network applications quickly. It uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. Node.js runs on a single thread event loop, handles concurrent connections without blocking and takes advantage of asynchronous programming. It is commonly used for real-time applications that require two-way communication between client and server like chat, streaming etc.
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node.js
- 2. Node.js is a software platform for scalable server-side and networking applications. Node.js applications are written in JavaScript, and can be run within the Node.js runtime on Windows, Mac OS X and Linux with no changes. Node.js applications are designed to maximize throughput and efficiency, using non-blocking I/O and asynchronous events. Node.js applications run single-threaded, although Node uses multiple threads for file and network events. Node.js internally uses the Google V8 JavaScript engine to execute code, and a large percentage of the basic modules are written in JavaScript. Node.js contains a built-in HTTP server library, making it possible to run a web server without Apache or Lighttpd. -Wikipedia
- 3. I/O needs to be done differently.
- 4. Many web applications have code like this: var result = db.query("select * from T"); // use result What is the software doing while it queries the database?
- 5. In many cases, just waiting for the response.
- 6. I/O latency L1: 3 cycles L2: 14 cycles RAM: 250 cycles DISK: 41,000,000 cycles NETWORK: 240,000,000 cycles
- 7. Better software can multitask. Other threads of execution can run while waiting.
- 10. Apache vs NGINX The difference? Apache uses one thread per Connection. NGINX doesn’t use threads. It uses an event loop.
- 11. Code like this var result = db.query("select.."); // use result either blocks the entire process or implies multiple execution stacks.
- 12. But a line of code like this db.query("select..", function (result) { // use result }); allows the program to return to the event loop immediately.
- 13. So why isn’t everyone using event loops, callbacks, and non-blocking I/O? For reasons both cultural and infrastructural.
- 14. What can you make with it?
- 15. Who is using it?
- 16. Is it easy to use?
- 17. What client libraries are available? Memcached, Redis, MySQL, MongoDB, Solr, RabbitMQ
- 18. MEAN framework
- 20. Questions?