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A JavaScript library for building user interfaces Introduction to React

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WHOAMI? • me@ usmanbashir.com • @ ubax • usmanbashir.com Who am I? Technology Consultant & Software Developer

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What is React?

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One React To Rule Them All

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ReactJS React Native React VR

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Learn Once, Write Anywhere

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Prerequisites

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ES6 arrow functions classes let const template literals

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What does React brings to the table?

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Components Virtual DOM Props & State

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Imperative vs. Declarative

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Example 1

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funtion submitForm() { // … var submitButton = $(‘button-id’); if (isFormValid === false) { submitButton.prop('disabled', true) .addClass('disabled'); } else { submitButton.prop('disabled', false) .removeClass('disabled'); } // … } Imperative (the old way)

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Declarative (the new way)

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Example 2

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if (userLikes()) { if (!hasBlueLike()) { removeGrayLike(); addBlueLike(); } } else { if (hasBlueLike()) { removeBlueLike(); addGrayLike(); } } Imperative (the old way)

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Declarative (the new way) if (this.state.liked) { return (); } else { return (); }

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UI = RENDER(state)

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Components

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Declarative Components

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class Button extends React.Component { render() { return ; } }

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class Button extends React.Component { render() { return ; } }

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class Button extends React.Component { render() { return ; } }

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Composed Components

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<PlainMenu /> <Header/>

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<PlainMenu /> <Header/>

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Reusable Components

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UI composed of

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Fast Rendering With Virtual DOM

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Before

Virtual DOM Before

After

Virtual DOM After React Virtual DOM

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PATCH … Set

to After … Batch of DOM operations React Virtual DOM

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Before

Real DOM Before

After

Real DOM After Browser DOM Apply

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Data Flow Props

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this.props

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class Welcome extends React.Component { render() { return

Hello, {this.props.name}!

; } }

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class Welcome extends React.Component { render() { return

Hello, {this.props.name}!

; } }

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Pure Functions

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Data Flow State

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this.state

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Imperative vs. Declarative After Credits

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Declarative (the new way)

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class SubmitButton extends React.Component { render() { const classes = `button submit ${this.props.disabled ? “disabled” : “”}`; return ; } }

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class SubmitButton extends React.Component { render() { const classes = `button submit ${this.props.disabled ? “disabled” : “”}`; return ; } }

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const classes = `button submit ${this.props.disabled ? “disabled” : “”}` Template literal

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Developer Tools

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Create React App

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React Developer Tools

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Usman Bashir Developer Circle Lead Workshop

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So... • Notes & Resources • Learn more • Build something • Share it with the community What's Next?

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Thank You