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Unmount ↔ (process) to remove UI from DOM API

aka Unmounted, Unmounting

References​

  1. componentWillUnmount() ↔ CC Lifecycle Method to trigger when CC Unmount from DOM API

  2. Run [useEffect()](useeffect) only [Cleanup](cleanup-function) for [**_Unmount_**](unmount) ↔ double Arrow Function to return Cleanup Function

useEffect(() => () => CLEANUP(),
  [] )

  1. destroyOnMount: true ↔ (default) reduxForm behaviour to dump form data on Unmount

  2. Cleanup Function ↔ function call on Unmount, via return function from useEffect()