You can think of it very similarly to `useState`, where it returns a particular state and a function to update that state.

With `useState`:

    const [ firstState, setFirstState ] = useState('alpha')
    const [ secondState, setSecondState ] = useState('beta')

With `usePromise`:

    const [ firstPromiseState, readFirstThing ] = usePromise(read)
    const [ secondPromiseState, readSecondThing ] = usePromise(read)

To initialize the promise state similar to `useState('alpha')`:

    const [ firstPromiseState, readFirstThing ] = usePromise(read, { status: 'resolved', value: 'alpha' })
    const [ secondPromiseState, readSecondThing ] = usePromise(read, { status: 'resolved', value: 'beta' })