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
240
Introduction to ExtReact, ExtAngular and ExtWebComponents
olgapetrova
0
69
Visual Feature Engineering for ML with React and TensorFlow.js
olgapetrova
0
69
Web Push Notifications
olgapetrova
1
290
How to add D3.js visualization to your Ext JS application
olgapetrova
1
590
Turbo-charged Data Analysis and Visualization using Ext JS 6.2
olgapetrova
3
96
ExtJS 6: one framework for all devices
olgapetrova
1
790
Other Decks in Programming
See All in Programming
Writing Better Go: Lessons from 10 Code Reviews
konradreiche
0
1.3k
CSC305 Lecture 08
javiergs
PRO
0
220
テーブル定義書の構造化抽出して、生成AIでDWH分析を試してみた / devio2025tokyo
kasacchiful
0
140
Cursorハンズオン実践!
eltociear
2
1.1k
Le côté obscur des IA génératives
pascallemerrer
0
150
Go Conference 2025: Goで体感するMultipath TCP ― Go 1.24 時代の MPTCP Listener を理解する
takehaya
9
1.7k
フロントエンド開発のためのブラウザ組み込みAI入門
masashi
1
340
Go言語はstack overflowの夢を見るか?
logica0419
0
370
私はどうやって技術力を上げたのか
yusukebe
44
19k
The Past, Present, and Future of Enterprise Java
ivargrimstad
0
430
『毎日の移動』を支えるGoバックエンド内製開発
yutautsugi
2
250
overlayPreferenceValue で実現する ピュア SwiftUI な AdMob ネイティブ広告
uhucream
0
190
Featured
See All Featured
How to train your dragon (web standard)
notwaldorf
97
6.3k
Building Better People: How to give real-time feedback that sticks.
wjessup
369
20k
A Modern Web Designer's Workflow
chriscoyier
697
190k
JavaScript: Past, Present, and Future - NDC Porto 2020
reverentgeek
52
5.6k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
morganepeng
132
19k
Speed Design
sergeychernyshev
32
1.2k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
31
2.7k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
26
3.1k
Large-scale JavaScript Application Architecture
addyosmani
514
110k
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
sstephenson
162
15k
The Straight Up "How To Draw Better" Workshop
denniskardys
238
140k
Building a Scalable Design System with Sketch
lauravandoore
463
33k
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