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
ReactでDecoratorsを使う
Search
Masashi Hirano
March 07, 2018
Programming
0
1.1k
ReactでDecoratorsを使う
React Beer Bash! (
https://react-beer-bash.connpass.com/event/78112/
) でLTしました
Masashi Hirano
March 07, 2018
Tweet
Share
More Decks by Masashi Hirano
See All by Masashi Hirano
Protocol Buffers and Connect for Frontend Development
masashi
0
99
You may not need XXX in Node.js
masashi
5
1.5k
OSSとコミュニティを支える
masashi
1
1.4k
英語ができなかった自分達が、グローバルチーム立ち上げに挑戦!?
masashi
1
3.4k
フロントエンド開発のためのセキュリティ入門について
masashi
1
530
フロントエンド開発のためのセキュリティ入門
masashi
49
18k
Node.jsの2022年と未来 / Node.js in 2022 and Future
masashi
1
1.1k
Corepack ~Node.jsに追加されたパッケージマネージャーマネージャー~ / #tng37
masashi
3
13k
Node.js + Web Compatibility
masashi
2
670
Other Decks in Programming
See All in Programming
今だからこそ入門する Server-Sent Events (SSE)
nearme_tech
PRO
3
250
Oracle Database Technology Night 92 Database Connection control FAN-AC
oracle4engineer
PRO
1
470
知っているようで知らない"rails new"の世界 / The World of "rails new" You Think You Know but Don't
luccafort
PRO
1
190
Navigation 2 を 3 に移行する(予定)ためにやったこと
yokomii
0
350
アプリの "かわいい" を支えるアニメーションツールRiveについて
uetyo
0
280
MCPでVibe Working。そして、結局はContext Eng(略)/ Working with Vibe on MCP And Context Eng
rkaga
5
2.3k
rage against annotate_predecessor
junk0612
0
170
速いWebフレームワークを作る
yusukebe
5
1.7k
基礎から学ぶ大画面対応(Learning Large-Screen Support from the Ground Up)
tomoya0x00
0
4.3k
2025 年のコーディングエージェントの現在地とエンジニアの仕事の変化について
azukiazusa1
24
12k
Ruby×iOSアプリ開発 ~共に歩んだエコシステムの物語~
temoki
0
350
Cache Me If You Can
ryunen344
2
4k
Featured
See All Featured
Build The Right Thing And Hit Your Dates
maggiecrowley
37
2.9k
What's in a price? How to price your products and services
michaelherold
246
12k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
9
810
jQuery: Nuts, Bolts and Bling
dougneiner
64
7.9k
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
32
1.6k
What’s in a name? Adding method to the madness
productmarketing
PRO
23
3.7k
The Cult of Friendly URLs
andyhume
79
6.6k
How to Think Like a Performance Engineer
csswizardry
26
1.9k
Principles of Awesome APIs and How to Build Them.
keavy
126
17k
Writing Fast Ruby
sferik
628
62k
Learning to Love Humans: Emotional Interface Design
aarron
273
40k
Navigating Team Friction
lara
189
15k
Transcript
ReactͰDecoratorsΛ͏ 2018/03/07 React Beer Bash ฏণ࢜ / @shisama
{ "about": { "name": "Masashi Hirano", "works": "Weblio, Inc.", "twitter":
"@shisama_", "github": "shisama" } }
͜ͷൃදʹ͍ͭͯ • JavaScriptͷ࠷ۙػೳΛઌऔΓͯ͠ReactͰ ͏ࣄྫΛհ • Reactͬͨ͜ͱ͋Δਓ͚ • ίʔυΛ؆ܿʹॻ͖͍ͨਓ͚
Agenda • Decoratorsͷհ • Decoratorsͷ࣮ྫ
Decoratorsͱ • EcmaScriptυϥϑτ(stage-2)ͷػೳ • ॲཧΛՃͨ͠Γஔ͖͑ͨΓͰ͖Δ • @ϚʔΫΛ͚ͨهड़ • JavaͷΞϊςʔγϣϯPythonͷσίϨʔ λʔΈ͍ͨͳهड़
• ໊લͷ༝དྷGoFͷσίϨʔλʔύλʔϯ
ྫ͑ϓϩύςΟͷՃ function name(name) { return function (target) { target.prototype.name =
name; } } ΫϥεʹOBNFͱ͍͏ϓϩύςΟΛՃ͢Δ ؔΛఆٛ
@name(“React") class App extends React.Component { ɹrender() { return (
<div> Hello, {this.name} </div> ); } } ReactDOM.render(<App />, document.getElementById('app')); ͜ͷίϯϙʔωϯτࣗମOBNFͱ͍ ͏ϓϩύςΟ͍࣋ͬͯͳ͍ σίϨʔλʔ
ϨϯμϦϯά݁Ռ Hello, React σίϨʔλʔؔʹΑͬͯOBNFͷϓ ϩύςΟ͕Ճ͞Εͨ
DecoratorsΛ͏ํ๏ • Babel • babel-plugin-transform-decorators-legacy Λ͏ɻ • TypeScript • tsc
--experimentalDecorators
Decoratorsͷࣄྫ
react-redux https://github.com/reactjs/react-redux
react-redux • ReduxͱstateΛཧ͢ΔϥΠϒϥϦ • react-reduxReactͱReduxΛͭͳ͛ΔϥΠϒ ϥϦ
react-redux class MyFancyComponent extends React.Component { // ׂѪ } const
mapStateToProps = (state) => { return { users: state.users }; } const mapDispatchToProps = (dispatch, ownProps) { return {// ׂѪ} } export default connect(mapStateToProps, mapDispatchToProps)(MyFancyComponent) SFBDUSFEVYͷDPOOFDUؔɻ Α͘ݟΔ͍ํ
react-redux @connect(mapStateToProps, mapDispatchToProps) class MyFancyComponent extends React.Component { // ׂѪ
} const mapStateToProps = (state) => { return { users: state.users }; } const mapDispatchToProps = (dispatch, ownProps) { return {// ׂѪ} } DPOOFDUΛσίϨʔλʔͱͯ͠$MBTT ʹ͚Δ͜ͱ͕Ͱ͖Δ
MobX https://mobx.js.org/best/decorators.html
MobX • ReduxΈ͍ͨʹstateΛཧ͢ΔϥΠϒϥϦ • ReduxΑΓ؆ܿʹॻ͚Δҹ
MobX class Timer { constructor() { extendObservable(this, { start: Date.now(),
current: Date.now(), get elapsedTime() { return (this.current - this.start) }, tick: action(function() { this.current = Date.now() }) }) } } FYUFOE0CTFSWBCMFؔΛͬͯ PCTFSWBCMFʹ͍ͯ͠Δ
MobX class Timer { @observable start = Date.now(); @observable current
= Date.now(); @computed get elapsedTime() { return (this.current - this.start) } @action tick() { this.current = Date.now() } } σίϨʔλʔΛͬͯ؆ܿʹॻ͚Δ
MobX https://mobx.js.org/best/decorators.html ެࣜʹࡌ͍ͬͯΔ
react-log-decorator https://github.com/shisama/react-log-decorator
react-log-decorator • ࡞ͬͨ • npm install —save react-log-decoratorͰೖΔ • rendercomponentDidMountͳͲͷϝιο
υ͕ݺΕͨͱ͖ʹpropsͱstateͱҾͷ Λίϯιʔϧʹදࣔ͢ΔσόοΨʔ
react-log-decorator import logger from 'react-log-decorator'; const log = logger(process.env.NODE_ENV ===
'development'); export default class MyComponent extends Component { @log render() { return ( <div> <input type="text" onChange = {this.props.onChange} /> <p>{this.props.message}</p> </div> ) } } ࣮ߦ࣌ʹQSPQTTUBUFͷ༰Λίϯ ιʔϧʹද͍ࣔͨ͠ϝιουʹ͚Δ
SFOEFS͕࣮ߦ͞ΕΔͨͼʹQSPQT TUBUFͷΛදࣔ react-log-decorator
pure-deep-equal https://github.com/shisama/pure-deep-equal
pure-deep-equal • ࡞ͬͨ • npm install —save pure-deep-equalͰೖΔ • shouldComponentUpdateͷதͰdeep
compare͢Δ
pure-deep-equal ࡞ͬͨܦҢ͜͜
pure-deep-equal class Test extends React.Component { shouldComponentUpdate(nextProps, nextState) { return
!deepEqual(this.props, nextProps) || !deepEqual(this.state, nextState); } render() { return <span>{this.props.message}</h1> } } TIPVME$PNQPOFOU6QEBUFͷதͰ EFFQDPNQBSF
pure-deep-equal @PureDeepEqual class Test extends React.Component { render() { return
<span>{this.props.message}</h1> } } TIPVME$PNQPOFOU6QEBUFΛ࣮͠ ͳͯ͘σίϨʔλ͕ؔEFFQ DPNQBSFͯ͘͠ΕΔ
Ͳ͏ͬͯ Decorators࡞Δͷʁ
https://qiita.com/shisama/items/ 45f07f39a46a9e7fa85a
࠷ޙʹ • DecoratorsΛ͑ίʔυ͕؆ܿʹͳΔ • ͚ͨΓ֎ͨ͠Γ͕؆୯ʹߦ͑ɺΞεϖΫτ ࢦతʹ͑Δ • ͨͩ͠ɺ·ͩఏҊதͷػೳͳͷͰ༷͕มΘ ΔՄೳੑ͋Δ
͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠