I create a hook that manages the state of a single object with fetch to api. This hook exposes function to interact with this object.
// the hook
const useMyHook = () => {
const [myObject, setMyObject] = useState(null);
useEffect(() => {
const fetchData = async () => {
const data = await fetchSomething();
setMyObject(data);
}
fetchData();
}, []);
const updateMyObject = async () => {
console.log(myObject); // log : { ... }
try {
console.log(myObject); // log : undefined
// ...
} catch(err) {
// ...
}
};
return {
updateMyObject,
myObject
};
};
Then i use this hook inside a component and trigger updateMyObject() with a button.
// the component
const MyComponent = () => {
const { myObject, updateMyObject } = useMyHook();
return (
<button onClick={updateMyObject}>
Click me
</button>
);
};
How is this possible that before the try catch block the log is clean and inside the block i get undefined ?
Your code is perfectly alright !! There could be a problem in the fetchSomething() method. Ideally, it should return data, but it's not doing the same job.
Here is a small example. You can give it a try.
const fetchSomething = async () => {
const response = await fetch(
"https://jsonplaceholder.typicode.com/posts/1"
).then((res) => res.json());
return response;
};
I think this gonna work
useEffect(() => {
const fetchData = async () => {
const data = await fetchSomething();
setMyObject(data);
}
If(!myObject)
fetchData();
}, [myObject]);