The How and Why of Flexible React Components

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1. The how and why of flexible React components THE HOW

   AND WHY OF FLEXIBLE REACT COMPONENTS

2. Hi! I’m Jenn. Senior Frontend Engineer, ClassPass @gurlcode

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4. flexible @gurlcode

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7. with Tooltip withTooltip @gurlcode

8. with Tooltip with Dot withTooltip withDot @gurlcode

9. with Tooltip with Dot with Modal withDot withModal withTooltip @gurlcode

10. <BlockComponent className=“block block-md block—orange” message={message} withTooltip={false} withModal modalProps={modalProps} userId={userId} userName={userName}

    withDot={false} experimentRunning experimentId={experimentId} colorChange={false} showMessageOnLoad onModalClose={() => {}} hasRoundedCorners withAnalytics analyticsProps={analyticsProps} /> BEWARE THE APROPSCALYPSE <BlockComponent className=“block block—md block—orange” withTooltip={false} withDot={false} withModal modalProps={modalProps} onModalClose={onModalClose} onMouseOver={onMouseOver} withExperiment experimentId={experimentId} userName={userName} userId={userId} analyticsProps={analyticsProps} roundedCorners /> @gurlcode

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13. You have another reservation at this time. @gurlcode

14. Is the user logged in? State of subscription? Join State

    of class? Reactivate Reserve Cancel Disabled Join yes no cancelled subscribed unsubscribed available unavailable reserved @gurlcode
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17. reusable !== flexible @gurlcode

18. Flexibility is about more than reusability. It’s about the ability

    understand and augment. @gurlcode

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21. <ScheduleCta type={?} /> @gurlcode

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26. Keep business logic out of your components. @gurlcode

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28. Centralized logic is easier to reason about @gurlcode

29. Test the component separate from the logic @gurlcode

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31. <ScheduleCta type={?} /> @gurlcode

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46. <ScheduleCta type={?} /> @gurlcode

47. components[type] @gurlcode

48. components = { reserve: ReserveCta, join: JoinCta, cancel: CancelCta, disable:

    DisableCta, reactivate: ReactivateCta } @gurlcode

49. const Component = components[type]; @gurlcode

50. const Component =`${left || right}Sidebar`; @gurlcode

51. const Component = props.isCard ? ( <Card> <Content /> </Card>

    ) : (<Content />); @gurlcode

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57. <ScheduleCta type={?} className=“” />

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59. Decreased prop complexity Use whatever logic we want Use individual

    CTAs alone Add & remove CTAs with ease Use whatever logic we want Use individual CTAs alone Add & remove CTAs with ease @gurlcode

60. CTAs added and removed for A/B tests Removing Disable CTA

    on some pages Classnames changed Messaging changed for ReserveCta Ask for specific CTA on specific page @gurlcode

61. Hmm… @gurlcode

62. Render Props* *children as a function @gurlcode

63. … so what if children were a function? @gurlcode

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65. ? ? ? ? ? ? ? ? ? ?

    ? ? ? ? ? ?? ?? ?? ? ? ?? ? ? ? ? ?? @gurlcode

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72. Render Props === state delegate children function === UI handler

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73. https://reactjs.org/docs/render-props.html https://github.com/paypal/downshift @gurlcode

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75. you === flexible @gurlcode

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77. Know your traps. @gurlcode

78. Kill your darlings. @gurlcode

79. Start with the ideal API Let the API inform the

    component design Decide what level of magic you want Business logic does not belong in components Render Props is awesome (use it!) Be flexible as an engineer (know your traps, kill your darlings) @gurlcode

80. Thank you! Content by Jenn Creighton Illustrations by Janny Ji

    (jannyji.com) @gurlcode