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+---
+title: useMediaQuery
+tags: hooks,state,effect,intermediate
+---
+
+A hook that returns a value based on a media query.
+
+- Check if `window` and `window.matchMedia` exist, return `whenFalse` if not.
+- Use `window.matchMedia()` to match the given `query`, cast its `matches` property to a boolean and store in a state variable, `match`, using `React.useState()`.
+- Use `React.useEffect()` to add a listener for changes and to clean up the listeners after the hook is destroyed.
+- Return either `whenTrue` or `whenFalse` based on the value of `match`.
+
+```jsx
+const useMediaQuery = (query, whenTrue, whenFalse) => {
+  if (typeof window === 'undefined' || typeof window.matchMedia === 'undefined') return whenFalse;
+  
+  const mediaQuery = window.matchMedia(query);
+  const [match, setMatch] = React.useState(!!mediaQuery.matches);
+
+  React.useEffect(() => {    
+    const handler = () => setMatch(!!mediaQuery.matches);
+    mediaQuery.addListener(handler);
+    return () => mediaQuery.removeListener(handler);
+  }, []);
+
+  return match ? whenTrue : whenFalse;
+};
+```
+
+```jsx
+const ResponsiveText = () => {
+  const text = useMediaQuery(
+    '(max-width: 400px)', 'Less than 400px wide', 'More than 400px wide'
+  );
+  
+  return <span>{text}</span>;
+}
+
+ReactDOM.render(<ResponsiveText />, document.getElementById('root'));
+```