If you want to run an effect and clean it up only once (on mount and unmount), you can pass an empty array ([]) as a second argument. This tells React that your effect doesn't depend on any values from props or state, so it never needs to re-run.

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    However, as the length of the array is not specified, you could pass an array of arbitrary length, including the empty array, [||]. Reason also always opts for the safest form of a given hook as well. So React.useState in JS can take an initial value or a function that returns an initial value. The former cannot be used safely in all situations, so ReasonReact only supports the second form which takes a function and uses the return.

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    React Native Firebase is the officially recommended collection of packages that brings React Native support for all Firebase services on both Android and iOS apps. Prerequisites Before getting started, the documentation assumes you are able to create a project with React Native and that you have an active Firebase project.

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