Invalid custom hook call - reactjs

Question

I'm just a react beginner. I'm trying to create a custom hook, which will be triggered once an onClick event is triggered. By what I see, I need to use the useRef hook, to take into account if the component is rendered by first time, or if it's being re-rendered.
My code approach is the next:
const Clear = (value) => {
const useClearHook = () => {
const stateRef = useRef(value.value.state);
console.log(stateRef);
useEffect(() => {
console.log("useEffect: ");
stateRef.current = value.value.state;
stateRef.current.result = [""];
stateRef.current.secondNumber = [""];
stateRef.current.mathOp = "";
console.log(stateRef.current);
value.value.setState({
...stateRef.current,
result: value.value.state.result,
secondNumber: value.value.state.secondNumber,
mathOp: value.value.state.mathOp,
});
}, [stateRef.current]);
console.log(value.value.state);
};
return <button onClick={useClearHook}>Clear</button>;
};
Any suggestion? Maybe I might not call ...stateRef.current in setState. I'm not sure about my mistake.
Any help will be appreciated.
Thanks!

Answer 1

Your problem is useClearHook is not a component (the component always goes with the first capitalized letter like UseClearHook), so that's why when you call useRef in a non-component, it will throw that error. Similarly, for useEffect, you need to put it under a proper component.
The way you're using state is also not correct, you need to call useState instead
Here is a possible fix for you
const Clear = (value) => {
const [clearState, setClearState] = useState()
const useClearHook = () => {
setClearState((prevState) => ({
...prevState,
result: [""],
secondNumber: [""],
mathOp: "",
}));
};
return <button onClick={useClearHook}>Clear</button>;
};
If your states on the upper component (outside of Clear). You can try this way too
const Clear = ({value, setValue}) => {
const useClearHook = () => {
setValue((prevState) => ({
...prevState,
result: [""],
secondNumber: [""],
mathOp: "",
}));
};
return <button onClick={useClearHook}>Clear</button>;
};
Here is how we pass it
<Clear value={value} setValue={setValue} />
The declaration for setValue and value can be like this in the upper component
const [value, setValue] = useState()