The How and Why of Flexible React Components

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The how and why of flexible React components THE HOW AND WHY OF FLEXIBLE REACT COMPONENTS

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

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@gurlcode

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flexible @gurlcode

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@gurlcode

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@gurlcode

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with Tooltip withTooltip @gurlcode

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with Tooltip with Dot withTooltip withDot @gurlcode

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with Tooltip with Dot with Modal withDot withModal withTooltip @gurlcode

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{}} hasRoundedCorners withAnalytics analyticsProps={analyticsProps} /> BEWARE THE APROPSCALYPSE @gurlcode

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@gurlcode

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@gurlcode

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You have another reservation at this time. @gurlcode

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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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@gurlcode

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reusable !== flexible @gurlcode

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Flexibility is about more than reusability. It’s about the ability understand and augment. @gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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Keep business logic out of your components. @gurlcode

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@gurlcode

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Centralized logic is easier to reason about @gurlcode

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Test the component separate from the logic @gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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components[type] @gurlcode

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components = { reserve: ReserveCta, join: JoinCta, cancel: CancelCta, disable: DisableCta, reactivate: ReactivateCta } @gurlcode

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const Component = components[type]; @gurlcode

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

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const Component = props.isCard ? ( ) : (); @gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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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

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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

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Hmm… @gurlcode

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Render Props* *children as a function @gurlcode

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… so what if children were a function? @gurlcode

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@gurlcode

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

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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@gurlcode

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Render Props === state delegate children function === UI handler @gurlcode

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

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@gurlcode

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you === ﬂexible @gurlcode

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@gurlcode

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Know your traps. @gurlcode

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Kill your darlings. @gurlcode

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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

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Thank you! Content by Jenn Creighton Illustrations by Janny Ji (jannyji.com) @gurlcode