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
Introduction to React
Search
Shuhei Kagawa
January 20, 2014
Technology
10
4.1k
Introduction to React
Facebook/Instagram の OSS UI ライブラリである React の紹介です。2014/1/20 に行われた M3 Tech Talk #17 で発表しました。
Shuhei Kagawa
January 20, 2014
Tweet
Share
More Decks by Shuhei Kagawa
See All by Shuhei Kagawa
Profiling Node.js apps on production
shuhei
0
890
Building a Pixel Art Editor with Elm
shuhei
1
790
Redux Middleware Wars (Japanese)
shuhei
8
1.8k
Redux Middleware Wars (English)
shuhei
0
170
Draw Animated Chart on React Native
shuhei
0
8.8k
Angular 2 Offline Compiler
shuhei
0
5.4k
Weird Attractors
shuhei
0
870
Angular 2 @ JS Ojisan #6-3
shuhei
1
3k
Introduction to Angular 2
shuhei
2
160
Other Decks in Technology
See All in Technology
ビジネス職が分析も担う事業部制組織でのデータ活用の仕組みづくり / Enabling Data Analytics in Business-Led Divisional Organizations
zaimy
1
290
Delegating the chores of authenticating users to Keycloak
ahus1
0
170
SREのためのeBPF活用ステップアップガイド
egmc
1
780
Reach American Airlines®️ Instantly: 19 Calling Methods for Fast Support in the USA
flyamerican
1
180
ゼロからはじめる採用広報
yutadayo
3
1k
ソフトウェアテストのAI活用_ver1.25
fumisuke
1
510
対話型音声AIアプリケーションの信頼性向上の取り組み
ivry_presentationmaterials
1
600
【LT会登壇資料】TROCCO新コネクタ「スマレジ」を活用した直営店データの分析
kazari0425
1
140
VS CodeとGitHub Copilotで爆速開発!アップデートの波に乗るおさらい会 / Rapid Development with VS Code and GitHub Copilot: Catch the Latest Wave
yamachu
2
300
PO初心者が考えた ”POらしさ”
nb_rady
0
220
20250707-AI活用の個人差を埋めるチームづくり
shnjtk
6
4.1k
第4回Snowflake 金融ユーザー会 Snowflake summit recap
tamaoki
1
330
Featured
See All Featured
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
tammyeverts
53
2.9k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
667
120k
10 Git Anti Patterns You Should be Aware of
lemiorhan
PRO
656
60k
The MySQL Ecosystem @ GitHub 2015
samlambert
251
13k
Git: the NoSQL Database
bkeepers
PRO
430
65k
Reflections from 52 weeks, 52 projects
jeffersonlam
351
21k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
507
140k
Docker and Python
trallard
44
3.5k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
48
2.9k
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
Scaling GitHub
holman
460
140k
[RailsConf 2023] Rails as a piece of cake
palkan
55
5.7k
Transcript
React Shuhei Kagawa @M3 Tech Talk - 2014/1/20
What’s React? • ͷ OSS ͳ Web UI ϥΠϒϥϦ •
JavaScript MVC Framework • ෳͷίϯϙʔωϯτΛΈ߹Θͤͯ UI Λߏஙɻ
None
Why React? • ࣮ɹFacebook, Instagram ͰΘΕ͍ͯΔɻClosure, jQuery ͱಉʹɺੈքͰ࠷ݫ͍͠ݱͰΘΕ͍ͯΔ JavaScript ϥ
ΠϒϥϦɻAngular Google ͷओཁͳϓϩμΫτͰΘΕͯ ͍ͳ͍ɻ • γϯϓϧɹ֮͑Δ͜ͱ͕গͳ͍ɻComponent ͚ͩɻAngular ͷ Controller, Model, Scope, Directive… • View ͚ͩɹطଘϓϩδΣΫτʹΈࠐΈ͍͢ɻFacebook Ͱ ίϝϯτཝ͔Β࣮ઓೖɻInstagram Ͱॳ Backbone.js ͱͷΈ߹ΘͤͰ༻ɻ
Declarative • Α͋͘ΔͷɺHTML Λ jQuery Ͱͪΐͪ͜ΐ͜ม ߋɻͩΜͩΜεύήοςΟʹɾɾɾɻ • React ͳΒɺαʔόαΠυͷΑ͏ʹςϯϓϨʔτ
ʢͷΑ͏ͳͷʣΛॻ͚ͩ͘ͰɺσʔλͷมߋʹԠ ͯ͡ DOM Λॻ͖ม͑ͯ͘ΕΔɻ • ࣗͰ DOM ૢ࡞ෆཁʂ
Declarative? • var Counter = React.createClass({ getInitialState: function () {
return { count: this.props.initialCount }; }, add: function (diff) { this.setState({ count: this.state.count + diff }); }, render: function () { return ( React.DOM.div(null, [ React.DOM.button({ onClick: this.add.bind(this, -1)}, “-“), React.DOM.span(null, [“Count: “, this.state.count]), React.DOM.button({ onClick: this.add.bind(this, 1)}, “+“) ]) ); } }); React.renderComponent(<Counter initialCount={100}>, document.body);
Declarative! • var Counter = React.createClass({ getInitialState: function () {
return { count: this.props.initialCount }; }, add: function (diff) { this.setState({ count: this.state.count + diff }); }, render: function () { return ( <div> <button onClick={this.add.bind(this, -1)}>-</button> <span>Count: {this.state.count}</span> <button onClick={this.add.bind(this, 1)}>+</button> </div> ); } }); React.renderComponent(<Counter initialCount={100}>, document.body);
JSX • DeNA Ͱ࡞ͬͯΔ AltJS ͱผɻ • JavaScript ͷதʹ HTMLʢΆ͍ͷʣ͕ॻ͚Δʂ
• return <div>{this.prop.name}</div>; • ୯७ʹ JavaScript ʹม͞ΕΔɻߦҰॹɻ • return React.DOM.div(null, this.prop.name);
JSX • ࣄલʹ JavaScript ʹίϯύΠϧ͓ͯ͘͠ɻ • $ npm install -g
react-tools $ jsx —watch src build • ϒϥβ্ͰίϯύΠϧՄೳɻ • <script src="build/react.js"></script> <script src="build/JSXTransformer.js"></script> <script type="text/jsx"> /** @jsx React.DOM */ React.renderComponent( <h1>Hello, world!</h1>, document.getElementById('example') ); </script>
Virtual DOM • DOM Λຖճॻ͖ͬͯ͢ɺແବͰʁը໘͕ͪΒͭ͘ͷͰ ʁ • ͕͔͔࣌ؒΔͷ DOM ૢ࡞ɻJavaScript
ͦͷͷ͍ʂ • JavaScript ্Ͱ Virtual DOM ΛߏஙɻVirtual DOM ಉ࢜Ͱࠩ Λͱͬͯɺ࣮ࡍͷ DOM ૢ࡞Λ࠷খݶʹ͑Δɻ • DOM πϦʔͷൺֱͬͯɺύϑΥʔϚϯεग़ΔͷʁώϡʔϦ εςΟΫεʹΑΓ O(n^3) ͔Β O(n) ʹɻ
Component • ೋछྨͷσʔλͰ UI Λඳըɻ • props: ֎͔Β͞ΕΔ • state:
ଆͰอ࣋ɾมߋ͢Δ • render() Ͱ্هͷೋछྨͷΛͬͯɺVirtual DOM Λߏங͢Δɻ • ௨ৗ props ͷมߋ·ͨ setState() ͷݺͼग़࣌͠ͷΈɺද͕ࣔߋ৽͞ΕΔɻ • ௨ৗඞཁͳ͍͕ɺखಈͰදࣔΛߋ৽͢Δ͜ͱՄೳɻforceUpdate() • ֎෦ͱͷΠϯλʔϑΣΠε props ͚ͩɻ
Composition • render() Ͱผͷ component Λࢠͱͯ࣋ͭ͜͠ͱ͕Ͱ͖Δɻ • ͔ΒࢠͷϝιουΛݺΜͩΓ͠ͳ͍ɻͨͩ props Λ͚ͩ͢ɻ
• <Parent name=“Oyataro” age={49} /> • render: function () { return ( <div> <Child name=“Taro” age={this.props.age - 25} /> <Child name=“Jiro” age={this.props.age - 30} /> </div> ); } • ͔ΒσʔλΛྲྀ͠ࠐΉͱɺ·Ͱσʔλ͕ߦ͖Δɻ
Demo https://github.com/shuhei/react-sample-counter
·ͱΊ • Facebook, Instagram Ͱͷ࣮ઓͰ͑ΒΕ͍ͯΔɻ • View ͷݟ௨͕͠ྑ͘ͳΔɻrender() ݟΕશͯ ͔Δɻ
• Virtual DOM Ͱ DOM ૢ࡞͍Βͣɻ • ࠶ར༻ੑͷߴ͍ ComponentɻJS ͱςϯϓϨʔτ͕ ͔Ε͍ͯͳ͍ͷͰɺऔΓճ͍͢͠ɻ
ඍົͳͱ͜Ζ • render Ͱฦ͢ͷɺҰͭͰͳ͍ͱ͍͚ͳ͍ɻෳ ͷཁૉΛฦ͢߹ <div /> Ͱғ͏ɻ • Bootstrap
Έ͍ͨʹΫϥε໊ͨ͘͞Μ͚ͭΔͷΛ JSX ͰΔͷඍົɻJSX தʹ Bootstrap ͷΫϥ ε໊͚ͭͣɺSass ͷ @extend ͳΜ͔ͰελΠϦ ϯά͢Δͱྑͦ͞͏ɻ
Q&A • ϞόΠϧͰ͑Δͷ͔ʁಛʹ੍ͳ͍ͣɻ • ରԠϒϥβʁIE8- αϙʔτɻJS ্Ͱ͍Ζ͍ΖΔͷͰɻDOM Λ͘Β͍࣮ͯ͠͠Δײ͡ɻ • ϝϞϦͷফඅ͕େ͖͍ͷͰʁVirtual
DOM ൺֱత͍ܰͣɻ2 ͭϖʔδΛ։͘ΑΓஅવ͍ܰɻ • Facebook ͷ OSS αϙʔτѱ͍ͱฉ͕͘ʁࠓͷͱ͜Ζɺ͔ͳΓ׆ൃɻ • ྑ͍αϯϓϧʁ͋·ΓΒͳ͍ɻFacebook Instagram ͷιʔεΛͬͯΈΔͷ͍͍͔ɻ͋ ͱɺࢥ͍ͭٙ͘υΩϡϝϯτʹ͍͍ͨͯॻ͍ͯ͋Δɻ • 1.0 ·ͰͷϩʔυϚοϓʁΘ͔Βͳ͍ɻ! • JSX Ͱ className ͱ͔͚͋ͬͨͲɺHTML ͱҧ͏ʁJS ʹͳΔͷͰɺ༧ޠɻHTML ͦͷͷͰ ͳ͍ɻΫϩεϒϥβͳཧతͳ DOMɻ • JSX ίϯύΠϧͷιʔεϚοϓରԠʁ·ͩɻPull Request དྷͯΔ͕·ͩϚʔδ͞Εͯͳ͍ɻ https://github.com/facebook/react/pull/833
References • ެࣜαΠτ - ؾʹͳΔͱ͜ΖΛઌճΓͯ͠ॻ͍ͯ͘Ε͍ͯΔɻ http://facebook.github.io/react/index.html • Github https://github.com/facebook/react •
Rethinking best practices - ίϯηϓτ͕த৺ͷߨԋɻ http://www.youtube.com/watch?v=x7cQ3mrcKaY • Introduction to React - ࣮دΓͷࡉ͔͍ɻ http://www.youtube.com/watch?v=XxVg_s8xAms • Khan Academy Ͱͷࣄྫ http://www.quora.com/React-JS-Library/How-is-Facebooks-React-JavaScript- library/answer/Ben-Alpert