reactjs - React Native Function Call

Question

I am very new to react native and out of curiosity I want to know that whether we can call a function which is defined inside useEffect hook, outside of the hook? Like, everytime i refresh the page the function should be fired. I have thought of this approach, if any better solutions are available kindly guide. I am using a functional component. This is what i want to acheive:

RefreshControl component
 {somefunction()}

useEffect(
somefunction(){

//function body
}
    )

question from:https://stackoverflow.com/questions/65599866/react-native-function-call

Answer 1

No, function will not be accessible outside of useEffect. Regular Javascript rules apply.

Why would you not define it outside of useEffect?

const foo = () => { console.log('yay') };

useEffect(() => {
  foo();
}, [])

It is also not rally clear what everytime i refresh the page means in the context of react-native, could you elaborate?

There is another way to "trigger" useEffect, to call it indirectly:

function C {
  [t, setT] = useState();
  useEffect(() => {
    const foo = () => console.log(t);
    foo();
  }, [t])
  return <Button onPress={() => setT(new Date())} title="Trigger foo" />
}

Above useEffect will be called at least every time t changes.