3 Lightning Talks that I gave as part of the Shibuya.js group while in Tokyo, November 2010.

1. ECMAScript 4:
The Reckoning
John Resig

2. 2007: ShibuyaJS

3. The Direction
ECMAScript 4
JavaScript 2 ActionScript 4
Tamarin
JScript Etc.
Screaming
Monkey
KJS (Apple)
Opera

4. A TON of new
features!

5. Classes
✦ class Programmer {
var name;
var city = “Boston, MA”;
const interest = “computers”;
function work() {}
}
✦ var p = new Programmer;
p.name = “John”;
p.work();
p.work.apply( someotherp );
p.interest = “science”; // Error
p.lastName = “Resig”; // Error

6. Catch-Alls
✦ dynamic class Programmer {
meta function get(name) { ... }
meta function set(name, value) {
alert(“Setting “ + name + “ to “ + value);
}
}
✦ var p = new Programmer
p.name = “John”;
// alert(“Setting name to John”);

7. Inheritance
✦ class Artist {
function draw() { alert(“Drawing!”); }
}
class Designer extends Artist {
override function draw() {
alert(“Designing!”);
}
}
✦ var d = new Designer
d.draw();
// alert(“Designing!”);

8. Interfaces
✦ Verify that a class implements another
✦ interface Artist {
function draw();
}
class Designer implements Artist {
function draw() { alert(“Designing!”); }
}
✦ var d = new Designer();
if ( d is Artist )
alert(“Designers are Artists!”);

9. Too much?

10. The new features are important!
They give the language more power and
make large applications easier to create.
Plus applications will be able to get faster!

11. The new features are important!
They give the language more power and
make large applications easier to create.
(Plus it’s close to what we’ve already
done in ActionScript!)

12. There are too many new features!
Not enough attention was paid to security.

13. Not enough attention was paid to security.

14. We don’t like it.

15. WAR!
YES NO

16. The Direction
ECMAScript 4
JavaScript 2 ActionScript 4
Tamarin
JScript Etc.
Screaming
Monkey
KJS (Apple)
Opera

17. Compromise:
NO SYNTAX CHANGES

18. Compromise:
LESS NEW FEATURES

19. ECMAScript 5!!

20. JSON Parsing
• JSON.parse(“true”) -> true
• JSON.stringify(true) -> “true”

21. Strict Mode
• (function(){
“use strict”;
// NO eval, with, etc.
})();

22. Object Properties
• var obj = {};
• Object.defineProperty( obj, "value", {
value: true,
writable: false,
enumerable: true,
configurable: true
});
• (function(){
var name = "John";
Object.defineProperty( obj, "name", {
get: function(){ return name; },
set: function(value){ name = value; }
});
})();

23. HARMONY:
Build off of ES5

24. What about Tamarin?

25. Don’t need it!
COMPETITION:
Everyone got faster!
Don’t need a new
language to get
faster.

26. More about ES5
• http://ejohn.org/blog/ecmascript-5-objects-
and-properties/
• http://ejohn.org/blog/ecmascript-5-strict-
mode-json-and-more/

27. Processing.js
John Resig

28. Processing
✦ Data visualization programming language
✦ Built on top of Java
✦ I ported it to JavaScript in 2008!
✦ Crude port of the Processing Language +
✦ Porting the 2D Processing API
✦ All runs in JavaScript on top of HTML 5
Canvas
✦ Works in all browsers (IE with excanvas)

29. The Language
✦ Strictly typed
✦ Has classes, inheritance
✦ A bunch of globally-accessible functions
✦ (Very flat API)
✦ setup() and draw() methods
✦ Very OpenGL-like
✦ draw() is called continually at a specific
framerate

30. Draw A Line w/ Mouse
✦ While you hold the mouse down, draw a
line from the previous mouse point
✦ http://ejohn.org/apps/processing.js/
examples/topics/continuouslines.html
✦ void setup() {
size(200, 200);
background(102);
}
void draw() {
stroke(255);
if (mousePressed) {
line(mouseX, mouseY, pmouseX, pmouseY);
}
}

31. Drawing
✦ Different drawing methods:
✦ line()
✦ rect()
✦ arc()
✦ ellipse()
✦ point()
✦ quad()
✦ triangle()
✦ bezier()
✦ All use stroke(), strokeWeight(), fill()

32. The Canvas
✦ OpenGL-y
✦ Mutate the canvas rendering:
✦ translate()
✦ scale()
✦ rotate()
✦ Save and Restore the state of the canvas:
✦ pushMatrix()
✦ popMatrix()
✦ http://ejohn.org/apps/processing.js/
examples/basic/arm.html

33. Shapes
✦ A series of vertices, built into a shape
✦ fill(127);
beginShape();
for (int i=0; i<segments; i++){
vertex(ground[i].x1, ground[i].y1);
vertex(ground[i].x2, ground[i].y2);
}
vertex(ground[segments-1].x2, height);
vertex(ground[0].x1, height);
endShape(CLOSE);

34. Classes
✦ Hold data, do inheritance
✦ http://ejohn.org/apps/processing.js/
examples/topics/reflection2.html
✦ class Ground {
float x1, y1, x2, y2, x, y, len, rot;
Ground(){ }
Ground(float x1, float y1, float x2, float y2) {
this.x1 = x1; this.y1 = y1; this.x2 = x2; this.y2 = y2;
x = (x1+x2)/2;
y = (y1+y2)/2;
len = dist(x1, y1, x2, y2);
rot = atan2((y2-y1), (x2-x1));
}
}
ECMAScript 4??

35. Processing.js 1.0!
✦ Just released yesterday!
✦ Full API parity with Processing
✦ ALSO
✦ Full WebGL/3D support!
✦ A great API for doing graphical work.

36. jQuery Mobile
John Resig

37. The Missing Gap
• Almost all mobile web development
focuses on modern WebKit
• There are far too many other platforms
• Blackberry, Opera,Windows Mobile,
Mobile Firefox, Symbian, etc.
• jQuery Mobile works everywhere - and
without sacrificing experience.

40. Phase 1: jQuery Core
• We’re working to make jQuery core work
on all the popular mobile browsers.
• Building out our test suite and continuous
integration testing.
• Using TestSwarm to automate our testing
across all platforms.
• Fixing mobile bugs in core.

42. Phase 2: jQuery Mobile
• A complete framework for building mobile
web sites and applications.
• Provide all the widgets and layout
components necessary to build mobile
sites.
• Built on the principles of progressive
enhancement