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JavaScript Presentation

Intro

History

  • 1995; Brendan Eich created in 10 days
  • Netscape Navigator
  • Copied into IE as "JScript"

The Name

  • JavaScript is not Java
  • It is a completely different language
  • AKA "ECMAScript"

Heritage

  • Inspired by LISP, particularly Scheme
    • Functions as first-class objects
    • Optional arguments
    • Loose typing
    • Closure
    • Tail recursion (coming soon!)
  • C syntax

Usages

  • Web & mobile apps
  • Browser plugins
  • Servers

Use it in the browser

REPL

  • Click F12 (Cmd+Option+I on Mac)
  • Choose "console"

Persistence

  • Create a folder called project\
  • Open Notepad
  • Create and save each of the following files
    • Be careful NOT to save as ".txt"! Choose "Save as type:" > "All files" and specify the file extensions.

project\index.html:

<script src="index.js"></script>

project\index.js:

console.log('Hello World!');
  • Open project\ folder, right-click on index.html
  • Choose "Open with" > "Google Chrome"
  • Click F12 and choose "console"

Use it as a server

REPL

  • Open command line ("cmd")
cd Downloads
node.exe
> console.log('hello world')
hello world
undefined
  • Type "Ctrl+C" to exit.

Persistence

  • Open Notepad
  • Create and save each of the following files

project\server.js:

var http = require('http');
http.createServer(function (request, response) {
  response.writeHead(200, {'Content-Type': 'text/plain'});
  response.end('Hello World\n');
}).listen(1337, '127.0.0.1');
console.log('Server running at http://localhost:1337/');
  • Open command line again
node.exe server.js
Server running at http://localhost:1337/
  • Open a web browser and navigate to http://localhost:1337/