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
Intro to Reactjs
Search
Michael Lancaster
May 12, 2015
Technology
5
2.2k
Intro to Reactjs
A quick intro to React.js
Michael Lancaster
May 12, 2015
Tweet
Share
More Decks by Michael Lancaster
See All by Michael Lancaster
Docker?! But I'm a frontend.
weblancaster
3
480
Soundnode, The Journey
weblancaster
0
220
intro to javascript unit tests for client side
weblancaster
0
180
Desktop Apps with NW.js and Angular.js (updated)
weblancaster
9
2.3k
CSS the right way?
weblancaster
15
2k
Other Decks in Technology
See All in Technology
現場で効くClaude Code ─ 最新動向と企業導入
takaakikakei
1
260
職種の壁を溶かして開発サイクルを高速に回す~情報透明性と職種越境から考えるAIフレンドリーな職種間連携~
daitasu
0
190
「何となくテストする」を卒業するためにプロダクトが動く仕組みを理解しよう
kawabeaver
0
440
AI時代を生き抜くエンジニアキャリアの築き方 (AI-Native 時代、エンジニアという道は 「最大の挑戦の場」となる) / Building an Engineering Career to Thrive in the Age of AI (In the AI-Native Era, the Path of Engineering Becomes the Ultimate Arena of Challenge)
jeongjaesoon
0
260
[ JAWS-UG 東京 CommunityBuilders Night #2 ]SlackとAmazon Q Developerで 運用効率化を模索する
sh_fk2
3
460
下手な強制、ダメ!絶対! 「ガードレール」を「檻」にさせない"ガバナンス"の取り方とは?
tsukaman
2
460
Aurora DSQLはサーバーレスアーキテクチャの常識を変えるのか
iwatatomoya
1
1.2k
20250905_MeetUp_Ito-san_s_presentation.pdf
magicpod
1
100
Create Ruby native extension gem with Go
sue445
0
130
テストを軸にした生き残り術
kworkdev
PRO
0
220
バイブスに「型」を!Kent Beckに学ぶ、AI時代のテスト駆動開発
amixedcolor
3
590
OCI Oracle Database Services新機能アップデート(2025/06-2025/08)
oracle4engineer
PRO
0
180
Featured
See All Featured
Helping Users Find Their Own Way: Creating Modern Search Experiences
danielanewman
29
2.9k
Building a Modern Day E-commerce SEO Strategy
aleyda
43
7.6k
[RailsConf 2023] Rails as a piece of cake
palkan
57
5.8k
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
46
7.6k
What’s in a name? Adding method to the madness
productmarketing
PRO
23
3.7k
For a Future-Friendly Web
brad_frost
180
9.9k
The World Runs on Bad Software
bkeepers
PRO
70
11k
GraphQLの誤解/rethinking-graphql
sonatard
72
11k
Building Applications with DynamoDB
mza
96
6.6k
Designing for Performance
lara
610
69k
Making the Leap to Tech Lead
cromwellryan
135
9.5k
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
marktimemedia
31
2.5k
Transcript
Intro to React.js
How a Chinese Company built a 57-storey skyscrapers in 19
days?
None
None
None
Composability Encapsulation Reusability Declarative Flexibility Performance Interoperability
None
JSX
import React from "react"; import ReactDOM from "react-dom"; class App
extends React.Component { constructor(props) { super(props); this.state = { todos: ['buy soy milk', 'call mom'] } } render() { return (<div><Todos todos={this.state.todos} /></div>) } } const Todos = ({todos}) => { return ( <ul> {todos.map(todo => { return <TodoItem key={todo.replace(' ', ‘’)} todo={todo} /> })} </ul> ) }; const TodoItem = ({todo}) => (<li>{todo}</li>); const rootElement = document.getElementById("root"); ReactDOM.render(<App />, rootElement);
None
Compiled
var App = (function(_React$Component) { _inherits(App, _React$Component); function App(props) {…}
_createClass(App, [ { key: "render", value: function render() { return React.createElement( "div", null, React.createElement(Todos, { todos: this.state.todos }) ); } } ]); return App; })(React.Component); var Todos = function Todos(_ref) { var todos = _ref.todos; return React.createElement( "ul", null, todos.map(function(todo) { return React.createElement(TodoItem, { key: todo.replace(" ", ""), todo: todo }); }) ); }; var TodoItem = function TodoItem(_ref2) { var todo = _ref2.todo; return React.createElement("li", null, todo); };
import React from "react"; import ReactDOM from "react-dom"; class App
extends React.Component { constructor(props) { super(props); this.state = { todos: ['buy soy milk', 'call mom'] } } render() { return (<div><Todos todos={this.state.todos} /></div>) } } const Todos = ({todos}) => { return ( <ul> {todos.map(todo => { return <TodoItem key={todo.replace(' ', ‘’)} todo={todo} /> })} </ul> ) }; const TodoItem = ({todo}) => (<li>{todo}</li>); const rootElement = document.getElementById("root"); ReactDOM.render(<App />, rootElement);
Diff Algorithm
Level by Level * source http://calendar.perfplanet.com/2013/diff/
Components * source http://calendar.perfplanet.com/2013/diff/
List * source http://calendar.perfplanet.com/2013/diff/
Batching * source http://calendar.perfplanet.com/2013/diff/
Sub-tree rendering * source http://calendar.perfplanet.com/2013/diff/
Selective Sub-tree rendering * source http://calendar.perfplanet.com/2013/diff/
Component Lifecycle
Mounting Update (new props or state) constructor() static getDerivedStateFromProps() render()
componentDidMount() static getDerivedStateFromProps() shouldComponentUpdate() render() getSnapshotBeforeUpdate() componentDidUpdate() Unmounting componentWillUnmount() Error Handling static getDerivedStateFromError() componentDidCatch()
Props vs State
- Props State Can get initial value from parent Component?
Yes Yes Can be changed by parent Component? Yes No Can set default values inside Component? Yes Yes Can change inside Component? No Yes Can set initial value for child Components? Yes Yes
React-Native React-Native-Web React-Primitives React-Sketch React-360 React-Native-Windows
Demo
Thanks!