JS Summit: Modular React & Redux

Transcript

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   Jeremy Fairbank blog.jeremyfairbank.com @elpapapollo | github.com/jfairbank MODULAR React& redux

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   We help brands excel. pushagency.io Your website, SimplyBuilt. simplybuilt.com

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   https://commons.wikimedia.org/wiki/File:2001_Monolith.jpg

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   https://commons.wikimedia.org/wiki/File:Close_up_of_Hand_Cut_Jigsaw_Puzzle.JPG

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   Modularity • Independent • Single Responsibility • Small • Testable

   • Apply to React components • Apply to Redux state and reducers
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   None
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   None
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   <Dashboard> <Panel label="Account"> <PanelItem>Name: {user.name}</PanelItem> <PanelItem>Username: {user.username}</PanelItem> <PanelItem>Email: {user.email}</PanelItem> </Panel>

   </Dashboard>
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   class NameTag extends React.Component { componentWillMount() { this.setState({ name: this.props.name

   }); } updateName(name) { this.setState({ name }); } render() { return ( <div> <p>Hello, my name is {this.state.name}</p> <p> <input type="text" value={this.state.name} onChange={e => this.updateName(e.target.value)} /> </p> </div> ); } } <NameTag name="Jeremy Fairbank"/>
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    <NameTag name="Jeremy Fairbank" onChange={myUpdateFunction}/> const NameTag = ({ name, onChange

    }) => ( <div> <p> Hello, my name is {name} </p> <p> <input type="text" value={name} onChange={e => onChange(e.target.value)} /> </p> </div> );
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    PROBLEMS STATE AND RESPONSIBILITY

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    const NameTag = ({ name, onChange }) => ( <div>

    <p> Hello, my name is {name} </p> <p> <input type="text" value={name} onChange={e => onChange(e.target.value)} /> </p> </div> ); External state
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    const NameTag = ({ name, onChange }) => ( <div>

    <p> Hello, my name is {name} </p> <p> <input type="text" value={name} onChange={e => onChange(e.target.value)} /> </p> </div> ); Who manages the state?
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    class NameTag extends React.Component { componentWillMount() { this.setState({ name: this.props.name

    }); } updateName(name) { this.setState({ name }); } render() { return ( <div> <p>Hello, my name is {this.state.name}</p> <p> <input type="text" value={this.state.name} onChange={e => this.updateName(e.target.value)} /> </p> </div> ); } }
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    class NameTag extends React.Component { componentWillMount() { this.setState({ name: this.props.name

    }); } updateName(name) { this.setState({ name }); } render() { return ( <div> <p>Hello, my name is {this.state.name}</p> <p> <input type="text" value={this.state.name} onChange={e => this.updateName(e.target.value)} /> </p> </div> ); } }
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    class NameTag extends React.Component { componentWillMount() { this.setState({ name: this.props.name

    }); } updateName(name) { this.setState({ name }); } render() { return ( <div> <p>Hello, my name is {this.state.name}</p> <p> <input type="text" value={this.state.name} onChange={e => this.updateName(e.target.value)} /> </p> </div> ); } } Many components => State strewn across app
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    class NameTag extends React.Component { componentWillMount() { this.setState({ name: this.props.name

    }); } updateName(name) { this.setState({ name }); } render() { return ( <div> <p>Hello, my name is {this.state.name}</p> <p> <input type="text" value={this.state.name} onChange={e => this.updateName(e.target.value)} /> </p> </div> ); } } Intermingling view and behavior => Violating SRP
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    PROBLEMS PROPS FATIGUE

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    const App = ({ name, onChangeName }) => ( <AppDashboard

    name={name} onChangeName={onChangeName}/> ); const AppDashboard = ({ name, onChangeName }) => ( <Dashboard> <Panel> <User name={name} onChangeName={onChangeName}/> </Panel> </Dashboard> ); const User = ({ name, onChangeName }) => ( <NameTag name={name} onChange={onChangeName}/> ); { name: 'Jeremy', onChangeName: (name) => { updateSomeGlobalState({ name }); } }
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    Wishlist • Manage state in one place outside of components

    in a modular fashion. • Define behavior separate from view. • Inject props without deep passing. (Like partial application.)
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    + Redux =

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    { user: { name: 'Jeremy', email: 'jeremy@example.com', username: 'elpapapollo' }

    } Store App
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    Provider & connect { user: { name: 'Jeremy', email: 'jeremy@example.com',

    username: 'elpapapollo' } } Store App
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    { name: 'Jet', type: 'UPDATE_NAME' } Action Provider & connect

    { user: { name: 'Jeremy', email: 'jeremy@example.com', username: 'elpapapollo' } } Store App Dispatch
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    { name: 'Jet', type: 'UPDATE_NAME' } Action Provider & connect

    { user: { name: 'Jet', email: 'jeremy@example.com', username: 'elpapapollo' } } New Store State App Dispatch { user: { name: 'Jeremy', email: 'jeremy@example.com', username: 'elpapapollo' } } Store Reducer
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    <Demo> <ContactManager/> </Demo> Demo

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    Recap • Modularity • Modular React components • Modular Redux

    reducers and state
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    Resources • facebook.github.io/react • redux.js.org • egghead.io/series/getting-started-with-redux

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    Jeremy Fairbank blog.jeremyfairbank.com @elpapapollo | github.com/jfairbank THANKS! Code: github.com/jfairbank/modular-react-and-redux-talk