Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
How to Re-Architect a JavaScript Class System
Search
Olga
May 13, 2019
Programming
0
120
How to Re-Architect a JavaScript Class System
Olga
May 13, 2019
Tweet
Share
More Decks by Olga
See All by Olga
Visual Feature Engineering for Machine Learning with React
olgapetrova
0
220
Introduction to ExtReact, ExtAngular and ExtWebComponents
olgapetrova
0
62
Visual Feature Engineering for ML with React and TensorFlow.js
olgapetrova
0
62
Web Push Notifications
olgapetrova
1
290
How to add D3.js visualization to your Ext JS application
olgapetrova
1
540
Turbo-charged Data Analysis and Visualization using Ext JS 6.2
olgapetrova
3
90
ExtJS 6: one framework for all devices
olgapetrova
1
760
Other Decks in Programming
See All in Programming
shadcn/uiを使ってReactでの開発を加速させよう!
lef237
0
390
chibiccをCILに移植した結果 (NGK2025S版)
kekyo
PRO
0
190
SRE、開発、QAが協業して挑んだリリースプロセス改革@SRE Kaigi 2025
nealle
1
3.3k
定理証明プラットフォーム lapisla.net
abap34
1
670
Simple組み合わせ村から大都会Railsにやってきた俺は / Coming to Rails from the Simple
moznion
3
3.7k
最近のVS Codeで気になるニュース 2025/01
74th
1
240
Rubyでつくるパケットキャプチャツール
ydah
0
530
Alba: Why, How and What's So Interesting
okuramasafumi
0
240
DMMオンラインサロンアプリのSwift化
hayatan
0
270
AWS re:Invent 2024個人的まとめ
satoshi256kbyte
0
150
はてなにおけるfujiwara-wareの活用やecspressoのCI/CD構成 / Fujiwara Tech Conference 2025
cohalz
3
3.2k
非ブラウザランタイムとWeb標準 / Non-Browser Runtimes and Web Standards
petamoriken
0
450
Featured
See All Featured
RailsConf 2023
tenderlove
29
980
jQuery: Nuts, Bolts and Bling
dougneiner
63
7.6k
BBQ
matthewcrist
85
9.4k
Rails Girls Zürich Keynote
gr2m
94
13k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
27
1.5k
A Philosophy of Restraint
colly
203
16k
GraphQLとの向き合い方2022年版
quramy
44
13k
Thoughts on Productivity
jonyablonski
68
4.4k
Become a Pro
speakerdeck
PRO
26
5.1k
Practical Orchestrator
shlominoach
186
10k
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
3.7k
Typedesign – Prime Four
hannesfritz
40
2.5k
Transcript
None
How to Re-Architect a JavaScript Class System Olga Petrova, @tyoushe
Developer Advocate, Sencha
Olga Petrova, @tyoushe Evolution of Standards and Technologies
Olga Petrova, @tyoushe
Olga Petrova, @tyoushe
Olga Petrova, @tyoushe What Makes Technology Future-Proof?
Olga Petrova, @tyoushe
Olga Petrova, @tyoushe
Olga Petrova, @tyoushe
Olga Petrova, @tyoushe Inheritance via Prototyping function MyComponent() {} MyComponent.prototype.init
= function() { //... } function MyChildComponent() {} MyChildComponent.prototype = Object.create(new MyComponent()); MyChildComponent.prototype.destroy = function() { //... } var cmp = new MyChildComponent(); cmp.init(); cmp.destroy();
Olga Petrova, @tyoushe
Olga Petrova, @tyoushe
Olga Petrova, @tyoushe
Olga Petrova, @tyoushe
Olga Petrova, @tyoushe Ext JS Class System ✔ Inheritance ✔
Config properties ✔ Dependencies ✔ Mixins ✔ Overrides ✔ Build tool
Olga Petrova, @tyoushe Ext JS Class Ext.define('My.own.Component', { extend: 'Ext.Component',
requires: ['My.Component.Dependency'], myProperty: true, myMethod: function() { //... this.callParent(arguments); }, statics: { staticMethod: function() { //... } } });
Olga Petrova, @tyoushe Ext JS Config Properties Ext.define('My.own.Component', { extend:
'Ext.Component‘, config: { myConfig: 'My Text' }, applyMyConfig: function(newTitle, oldTitle) { //implement validation return newTitle; }, updateMyConfig: function(newTitle, oldTitle) { //implement side effects } });
Olga Petrova, @tyoushe Ext JS Overrides var MyComponent = new
Ext.Component({}); Ext.override(MyComponent, { myProperty: 'My Text', myMethod: function () { //... } });
Olga Petrova, @tyoushe Ext JS Mixins Ext.define('Mixin‘, { processData: function(data)
{ /**/ } }); Ext.define('MyComponent‘, { mixins: { myMixin: 'Mixin' }, processData: function(data) { //... this.mixins.myMixin.processData.call(this); } });
Olga Petrova, @tyoushe 10K CUSTOMERS WORLDWIDE 2M SENCHA DEVS WORLDWIDE
7.2M PRODUCT DOWNLOADS 500K ACTIVE FORUM MEMBERS 60% of Fortune 100 Companies Rely on Sencha
Olga Petrova, @tyoushe
Olga Petrova, @tyoushe ECMAScript6 Class system
Olga Petrova, @tyoushe
Olga Petrova, @tyoushe
Olga Petrova, @tyoushe
Olga Petrova, @tyoushe ECMAScript6 Class Systems ✔ Inheritance ✔ Dependencies
✔ Build tool ❌ Config properties ❌ Mixins ❌ Overrides
Olga Petrova, @tyoushe
Olga Petrova, @tyoushe + =
Olga Petrova, @tyoushe + =
Olga Petrova, @tyoushe
Olga Petrova, @tyoushe Decorator pattern is a design pattern that
allows behavior to be added to an individual object, dynamically, without affecting the behavior of other objects from the same class
Olga Petrova, @tyoushe JavaScript Decorators
Olga Petrova, @tyoushe @wrap Method class C { @wrap(f) method()
{ } } class C { method() { } } C.prototype.method = f(C.prototype.method); =>
Olga Petrova, @tyoushe @wrap Class @wrap(f) class C { }
class C { } C = f(C); =>
Olga Petrova, @tyoushe JavaScript Class Fields
Olga Petrova, @tyoushe Class Fields class MyComponent { myField =
42; }
Olga Petrova, @tyoushe ECMAScript 6 to Ext JS Class Systems
✔ Inheritance ✔ Dependencies ✔ Build tool ✔ Config properties @define for class & @config for class fields ✔ Mixins @define for class ✔ Overrides @override for class
Olga Petrova, @tyoushe Class @define({ prototype: { myProperty: "My text"
}, static: { myStaticProperty: 42 } }) class MyOwnComponent extends Component { // }
Olga Petrova, @tyoushe Configs @define class MyOwnComponent extends Component {
@config('nullify') myConfig = 42; applyMyConfig (value, oldValue) { //validation return value; } updateMyConfig (value, oldValue) { //side effects } }
Olga Petrova, @tyoushe Mixins @define class Mixin extends Base {
processData (data) {...} } @define({ mixins: [ Mixin ] }) class MyComponent extends Component { @junction processData (data) { super.processData(data); } }
Olga Petrova, @tyoushe Overrides class MyComponent extends Component {} @override(MyComponent)
class MyComponentOverride { myProperty = ‘My Text’; myMethod () { //... } }
Olga Petrova, @tyoushe Life-cycle Methods class MyComponent extends Component {
ctor () { // do constructor-like things } setup() { // finalize configuration } dtor () { // do destructor-like things } }
Olga Petrova, @tyoushe Lessons Learned
Olga Petrova, @tyoushe Follow Standards if You Can
Olga Petrova, @tyoushe Estimate Effort on Re-write
Olga Petrova, @tyoushe Encapsulate
Olga Petrova, @tyoushe Keep your Eyes on New Standards
Olga Petrova, @tyoushe Start to Adapt Earlier
Olga Petrova, @tyoushe Keep Decorator/Adapter/Facade Patterns in Mind
Olga Petrova, @tyoushe 3