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+---
+title: useToggler
+tags: hooks,state,callback,beginner
+---
+
+Provides a boolean state variable that can be toggled between its two states.
+
+- Use the `useState()` hook to create the `value` state variable and its setter.
+- Create a function that toggles the value of the `value` state variable and memoize it, using the `useCallback()` hook.
+- Return the `value` state variable and the memoized toggler function.
+
+```jsx
+const useToggler = initialState => {
+  const [value, setValue] = React.useState(initialState);
+
+  const toggleValue = React.useCallback(() => setValue(prev => !prev), []);
+
+  return [value, toggleValue];
+};
+```
+
+```jsx
+const Switch = () => {
+  const [val, toggleVal] = useToggler(false);
+  return <button onClick={toggleVal}>{val ? 'ON' : 'OFF'}</button>;
+};
+ReactDOM.render(<Switch />, document.getElementById('root'));
+```