-
Notifications
You must be signed in to change notification settings - Fork 30
/
classes.html
483 lines (432 loc) · 12 KB
/
classes.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
<!--
Google IO 2012/2013 HTML5 Slide Template
Authors: Eric Bidelman <ebidel@gmail.com>
Luke Mahé <lukem@google.com>
URL: https://code.google.com/p/io-2012-slides
-->
<!DOCTYPE html>
<html>
<head>
<title>Classes</title>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="chrome=1">
<!--<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0">-->
<!--<meta name="viewport" content="width=device-width, initial-scale=1.0">-->
<!--This one seems to work all the time, but really small on ipad-->
<!--<meta name="viewport" content="initial-scale=0.4">-->
<meta name="apple-mobile-web-app-capable" content="yes">
<link rel="stylesheet" media="all" href="theme/css/default.css">
<link rel="stylesheet" media="only screen and (max-device-width: 480px)" href="theme/css/phone.css">
<base target="_blank"> <!-- This amazingness opens all links in a new tab. -->
<script data-main="js/slides" src="js/require-1.0.8.min.js"></script>
</head>
<body style="opacity: 0">
<slides class="layout-widescreen">
<slide class="title-slide segue nobackground">
<aside class="gdbar"><img src="images/es6.png"></aside>
<!-- The content of this hgroup is replaced programmatically through the slide_config.json. -->
<hgroup class="auto-fadein">
<h1 data-config-title style="display: none;"><!-- populated from slide_config.json --></h1>
<h2 data-config-subtitle style="display: none;"><!-- populated from slide_config.json --></h2>
<p data-config-presenter style="display: none;"><!-- populated from slide_config.json --></p>
<h1>Classes</h1>
<p data-config-presenter><!-- populated from slide_config.json --></p>
</hgroup>
</slide>
<slide>
<hgroup>
<h2>Classes</h2>
</hgroup>
<article>
<p>
<h4>History of ES6 Classes</h4>
</p>
<ul class="build fade">
<li>Goes back to ES4 days</li>
<li>Lots of Churn</li>
<li>Lots of Precedence</li>
<li><a href="https://mail.mozilla.org/pipermail/es-discuss/2012-March/021430.html">Russell Leggett, March 19 2012</a></li>
</ul>
</article>
</slide>
<slide>
<hgroup>
<h2>Classes</h2>
</hgroup>
<article>
<p>
<h4>Russell Leggett's Proposal</h4>
</p>
<ul class="build fade">
<li>Called "Maximall Minimal Classes"</li>
<li>Points out the need for classes in JS, a la CoffeeScript</li>
<li>Make sure it is enhanceable in Future Harmony Releases</li>
<li>Points to Brendan's <b>Goldilocks Proposal</b></li>
<li>Proposes new analogy - <b>Safety School Proposal</b></li>
<li><b>Since we must have something in ES6, what is it?</b></li>
<li>Wins Out! (not easily)</li>
</ul>
</article>
</slide>
<slide>
<hgroup>
<h2>Classes</h2>
</hgroup>
<article>
<p>
<h4><a href="http://wiki.ecmascript.org/doku.php?id=strawman:maximally_minimal_classes">Class Proposal Site</a></h4>
</p>
<h2>There Be Dragons!!</h2>
</article>
</slide>
<slide>
<hgroup>
<h2>Classes</h2>
</hgroup>
<article>
<p>
<h4>Example</h4>
</p>
<pre class="prettyprint" data-lang="javascript">
<b>//FUNCTIONALLY SAME</b>
function Foo(){
//....
}
class Foo{
//....
}
</pre>
<ul class="build fade">
<li>Class is sugar</li>
</ul>
</article>
</slide>
<slide>
<hgroup>
<h2>Classes</h2>
</hgroup>
<article>
<p>
Constructor
</p>
<pre class="prettyprint" data-lang="javascript">
class Animal{
<b>constructor(name)</b>{
this.name = name;
}
}
</pre>
</article>
</slide>
<slide>
<hgroup>
<h2>Classes</h2>
</hgroup>
<article>
<p>
<a href="http://google.github.io/traceur-compiler/demo/repl.html#%2F%2F%20Options%3A%20--annotations%20--array-comprehension%20--async-functions%20--block-binding%20--exponentiation%20--generator-comprehension%20--source-maps%20--symbols%20--types%20%0A%0Avar%20a%20%3D%20(function()%7B%0A%20%20var%20monsterHealth%20%3D%20Symbol()%3B%0A%20%20console.log(monsterHealth)%3B%0A%0A%20%20class%20Monster%7B%0A%20%20%20%20constructor(name%2C%20health)%7B%0A%20%20%20%20%20%20this.name%20%3D%20name%3B%0A%20%20%20%20%20%20this%5BmonsterHealth%5D%20%3D%20health%3B%0A%20%20%20%20%7D%0A%20%20%7D%0A%20%20%0A%20%20return%20Monster%3B%0A%7D)()%3B%0A%0Aconsole.log(a)%3B">
Private Properties
</a>
</p>
<pre class="prettyprint" data-lang="javascript">
<b>const monsterHealth = Symbol();</b>
class Monster{
constructor(name, health){
this.name = name;
<b>this[monsterHealth] = health;</b>
}
}
</pre>
<ul class="build fade">
<li>Look at <a href="http://google.github.io/traceur-compiler/demo/repl.html#%2F%2F%20Options%3A%20--annotations%20--array-comprehension%20--async-functions%20--block-binding%20--exponentiation%20--generator-comprehension%20--source-maps%20--symbols%20--types%20%0A%0Avar%20a%20%3D%20(function()%7B%0A%20%20var%20monsterHealth%20%3D%20Symbol()%3B%0A%20%20console.log(monsterHealth)%3B%0A%0A%20%20class%20Monster%7B%0A%20%20%20%20constructor(name%2C%20health)%7B%0A%20%20%20%20%20%20this.name%20%3D%20name%3B%0A%20%20%20%20%20%20this%5BmonsterHealth%5D%20%3D%20health%3B%0A%20%20%20%20%7D%0A%20%20%7D%0A%20%20%0A%20%20return%20Monster%3B%0A%7D)()%3B%0A%0Aconsole.log(a)%3B">Symbols</a></li>
</ul>
</article>
</slide>
<slide>
<hgroup>
<h2>Classes</h2>
</hgroup>
<article>
<p>
Get Properties
</p>
<pre class="prettyprint" data-lang="javascript">
const monsterHealth = Symbol();
class Monster{
constructor(name, health){
this.name = name;
this[monsterHealth] = health;
}
<b>get isAlive(){</b>
return this[monsterHealth] > 0;
}
}
</pre>
</article>
<aside class="note">
<section>
<pre class="prettyprint" data-lang="javascript">
let nessy = new Monster('Nessy', 100);
console.log(<b>nessy.isAlive</b>); <b>//Logs true</b>
</pre>
</section>
</aside>
</slide>
<slide>
<hgroup>
<h2>Classes</h2>
</hgroup>
<article>
<p>
Set Properties
</p>
<pre class="prettyprint" data-lang="javascript">
//....
class Monster{
constructor(name, health){
this.name = name;
this[monsterHealth] = health;
}
//...
<b>set health(val){</b>
if(val < 0){
throw new Error('Health must be positive number');
}
this[monsterHealth] = val;
}
}
</pre>
</article>
<aside class="note">
<section>
<pre class="prettyprint" data-lang="javascript">
let nessy = new Monster('Nessy', 100);
<b>nessy.health = 200; //Cause nessy is bad A</b>
</pre>
</section>
</aside>
</slide>
<slide>
<hgroup>
<h2>Classes</h2>
</hgroup>
<article>
<p>
Prototype Methods
</p>
<pre class="prettyprint" data-lang="javascript">
//....
class Monster{
constructor(name, health){
this.name = name;
this[monsterHealth] = health;
}
//...
<b>attack(target){</b>
console.log(this.name + ' attacks ' + target.name);
}
}
</pre>
</article>
<aside class="note">
<section>
<pre class="prettyprint" data-lang="javascript">
let nessy = new Monster('Nessy', 100);
let dom = new Monster('Dominique', 20);
<b>nessy.attack(dom); //Nessy attacks Dominique</b>
</pre>
</section>
</aside>
</slide>
<slide>
<hgroup>
<h2>Classes</h2>
</hgroup>
<article>
<p>
Class Properties
</p>
<pre class="prettyprint" data-lang="javascript">
class Monster{
constructor(name, health){
this.name = name;
this[monsterHealth] = health;
<b>Monster.allMonsters.push(this);</b>
}
//....
}
<b>Monster.allMonsters = [];</b>
</pre>
</article>
</slide>
<slide>
<hgroup>
<h2>Classes</h2>
</hgroup>
<article>
<p>
Extend Classes
</p>
<pre class="prettyprint" data-lang="javascript">
class Monster{
constructor(name, health){
this.name = name;
this[monsterHealth] = health;
}
//....
}
<b>class Godzilla extends Monster{</b>
constructor(){
<b>super('Godzilla', 10000);</b>
}
}
</pre>
<ul class="build fade">
<li>Could we do this with Prototypes?</li>
</ul>
</article>
<aside class="note">
<section>
<h4>How to use this</h4>
<pre class="prettyprint" data-lang="javascript">
let zilly = new Godzilla();
zilly instanceof Gozilla; <b>//true</b>
zilly instanceof Monster; <b>//true</b>
</pre>
</section>
</aside>
</slide>
<slide>
<hgroup>
<h2>Classes</h2>
</hgroup>
<article>
<p>
Extend Classes via Expression
</p>
<pre class="prettyprint" data-lang="javascript">
class MySocket <b>extends getClass()</b> {
//....
}
function getClass(){
if(isIE()){
return IEWebSocketImpl;
}
return WebSocket;
function isIE(){
return false;
}
}
</pre>
</article>
</slide>
<slide>
<hgroup>
<h2>Classes</h2>
</hgroup>
<article>
<pre class="prettyprint" data-lang="javascript">
class Monster{
constructor(name, health){
this.name = name;
this[monsterHealth] = health;
}
attack(target){...}
}
class Godzilla extends Monster{
constructor(){
super('Godzilla', 10000);
}
attack(target){
<b>super(target); //Currently THIS</b>
<b>super.attack(target); //Could Change to THIS</b>
}
}
</pre>
</article>
</slide>
<slide>
<hgroup>
<h2>Classes</h2>
</hgroup>
<article>
<p>
<h4>Classes Do No Hoist</h4>
</p>
<pre class="prettyprint" data-lang="javascript">
new Bar(); <b>//runtime error</b>
class Bar{}
</pre>
</article>
</slide>
<slide>
<hgroup>
<h2>Classes</h2>
</hgroup>
<article>
<p>
<h4>If no constructor, default behavior</h4>
</p>
<pre class="prettyprint" data-lang="javascript">
constructor(..args){
super(...args);
}
</pre>
</article>
</slide>
<slide>
<hgroup>
<h2>Classes</h2>
</hgroup>
<article>
<p>
<h4>Benefits of Classes</h4>
</p>
<ul class="build fade">
<li>Sugar</li>
<li>Easier to learn #noobs</li>
<li>Subclassing easier to learn #noobs</li>
<li>Subclass built in object: Array, Error, etc</li>
<li>Code more portable between JS Frameworks</li>
<li>Possible Perf Gains</li>
</ul>
</article>
</slide>
<!-- -->
<slide class="segue dark quote nobackground">
<aside class="gdbar right bottom"><img src="images/es6.png"></aside>
<article class="flexbox vleft auto-fadein">
<h2>Classes</h2>
<h3>Questions???</h3>
<div class="author">
#ES6 #frontendmasters @js_dev
</div>
</article>
</slide>
<slide>
<hgroup>
<h2>TRY THIS</h2>
</hgroup>
<article>
<ul>
<li><b>Classes</b> in <a href="http://google.github.io/traceur-compiler/demo/repl.html#%2F%2F%20Options%3A%20--annotations%20--array-comprehension%20--async-functions%20--block-binding%20--exponentiation%20--generator-comprehension%20--symbols%20--types%0A%0A">Traceur Repl</a></li>
<li><b>Classes</b>: build some inheritance model</li>
<li>Build something in Prototype AND Class</li>
<li>Force method implementation from Super</li>
</ul>
</article>
</slide>
<slide class="backdrop"></slide>
</slides>
<script>
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-XXXXXXXX-1']);
_gaq.push(['_trackPageview']);
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
</script>
</body>
</html>