use-error.md

title	type	language	tags	cover	dateModified
React useError hook	snippet	react	hooks state effect	cloudy-mountaintop	2021-09-30

Creates an error dispatcher.

• Use the useState() hook to create a state variable that holds the error.
• Use the useEffect() hook to throw the error whenever it's truthy.
• Use the useCallback() hook to update the state and return the cached function.

const useError = err => {
  const [error, setError] = React.useState(err);

  React.useEffect(() => {
    if (error) throw error;
  }, [error]);

  const dispatchError = React.useCallback(err => {
    setError(err);
  }, []);

  return dispatchError;
};

const ErrorButton = () => {
  const dispatchError = useError();

  const clickHandler = () => {
    dispatchError(new Error('Error!'));
  };

  return <button onClick={clickHandler}>Throw error</button>;
};

ReactDOM.createRoot(document.getElementById('root')).render(
  <ErrorButton />
);