Nodejs
- 1. NODE JS Server Side JavaScript
- 2. Background âą V8 is an open Source JavaScript engine developed my google ,it is used in google chrome browser âą Node Js runs onV8 âą It is Open Source and created in 2009
- 3. Why Node ? âNode's goal is to provide an easy way to build scalable Network programsâ âą Non Blocking I/O model âą It makes use of event loops via JavaScriptâs callback functionality âą Windows, Linux, Mac âą 1 Language for Frontend and Backend âą Easy to get started.
- 4. Event Loop
- 5. Non Blocking âą Blocking âą Non-Blocking
- 6. Queued Inputs âą If youâre receiving a high amount of concurrent data, your database can become a bottleneck. âą But because database access is a blocking operation (in this case), we run into trouble. âą The solution is to acknowledge the clientâs behavior before the data is truly written to the database
- 7. Node JS Modules âą Node js heavily relies on modules âą Creating an in -built module is easy, just put JS code in a separate js file and include in the code b using require Var module_cal = require(â./calculatorâ); âą Libraries in Node js are called packages and they can be installed by typing npm install âpackage_nameâ âą NPM (Node Package Manager ) Comes bundled with Node js installation
- 8. Node JS Modules âą Express -to make syntax and DB connections simpler âą Nodemon - to monitor Node.js and push change automatically âą Mongoskin - to make mongo queries simpler
- 11. What can be done with Node JS âą Create HTTP/TCP Server âą Create DNS Server âą Static File Server âą Web Chat Application âą Games or anything which sends updates to user in real-time