Something about node basics
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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 using an event-driven, non-blocking I/O model that makes it lightweight and efficient, especially for data-intensive real-time applications that run across distributed devices. The document provides an introduction to Node.js and its core components, demonstrates how to create a simple HTTP server, and discusses how to take advantage of the Node package ecosystem and modules to build applications and share reusable code.
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Something about node basics
- 1. Something about Node The basics
- 3. Google’s JavaScript VM V8
- 4. POSIX
- 5. libuv
- 7. Why node.js?
- 9. V8 = Speed!
- 10. Easy to get started with…
- 11. var http = require("http") ! var html = "<html>" + "<title>Hello Node</title>" + "<body>Hello Node</body>" + "</html>" ! var handler = function(req, res) { res.writeHead(200, { "Content-Type": "text/html" }) res.end(html) } ! http.createServer(handler).listen(3000, "127.0.0.1")
- 12. It’s all about the ecosystem!
- 13. NPM
- 14. “If some component is reusable enough to be a module then the maintenance gains are really worth the overhead of making a new project with separate tests and docs.” – James Halliday (http://substack.net/how_I_write_modules)
- 15. mkdir -p my_thing cd my_thing npm init
- 16. package.json
- 17. { "name": "my_thing", "version": "0.0.0", "description": "detect what is my thing", "main": "index.js", "scripts": { "test": "node ./test.js" }, "keywords": [ "my", "thing" ], "author": "sideshowcoder", "license": "BSD-2-Clause" }
- 18. index.js
- 19. var myThing = function(thing, cb) { if(thing.match(/snowboard*/)) { cb(null, thing + ", is my thing!") } else { cb(thing + ", is not really my thing!") } } ! module.exports = myThing
- 20. var myThing = require("./") ! var handler = function(err, res) { if(err) { console.log(err) return } console.log(res) } ! myThing("snowboardng into a beertent", handler) myThing("walking into a beertent", handler) !
- 21. Install and use modules
- 22. npm install --save minimist
- 23. var myThing = require("../my_thing") var argv = require("minimist")(process.argv.slice(2)) ! myThing(argv.i, function(err, res) { if(err) return console.error(err) console.log(res) }) !
- 24. Build cat in node!
- 25. Why node for client side engineering?
- 26. Browserify
- 27. You can use almost* everything here for webapps *The browser is not an OS sorry :(
- 28. Pitfalls & “Best practices”
- 30. myThing(argv.i, function(err, res) { if(err) return console.error(err) console.log(res) }) ! … because! myThing("snowboardng into a beertent", handler) ! !
- 31. Beware of the V of evil doThisFirst(function(err) { if(err) throw err nowDoThis(function() { if(err) throw err andFinallyDoThis() { if(err) throw err done() }) }) })
- 32. JavaScript is more OO than you think!
- 33. Exceptions are not control flow!
- 34. function wait(cb) { setTimeout(cb, 100); } try { wait(function() { throw new Error("Out of time") }) } catch(e) { console.log(e) }
- 35. Don’t call the callback more than once!
- 36. function going(err, cb) { if(err) cb(err) cb() } ! going("wild", function() { console.log("going wild") }) ! !