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+---
+title: useSet
+tags: hooks,state,advanced
+firstSeen: 2021-11-01T05:00:00-04:00
+---
+
+Creates a stateful `Set` object, and a set of functions to manipulate it.
+
+- Use the `useState()` hook and the `Set` constructor to create a new `Set` from the `initialValue`.
+- Use the `useMemo()` hook to create a set of non-mutating actions that manipulate the `set` state variable, using the state setter to create a new `Set` every time.
+- Return the `set` state variable and the created `actions`.
+
+```jsx
+const useSet = initialValue => {
+  const [set, setSet] = React.useState(new Set(initialValue));
+
+  const actions = React.useMemo(
+    () => ({
+      add: item => setSet(prevSet => new Set([...prevSet, item])),
+      remove: item =>
+        setSet(prevSet => new Set([...prevSet].filter(i => i !== item))),
+      clear: () => setSet(new Set()),
+    }),
+    [setSet]
+  );
+
+  return [set, actions];
+};
+```
+
+```jsx
+const MyApp = () => {
+  const [set, { add, remove, clear }] = useSet(new Set(['apples']));
+
+  return (
+    <div>
+      <button onClick={() => add(String(Date.now()))}>Add</button>
+      <button onClick={() => clear()}>Reset</button>
+      <button onClick={() => remove('apples')} disabled={!set.has('apples')}>
+        Remove apples
+      </button>
+      <pre>{JSON.stringify([...set], null, 2)}</pre>
+    </div>
+  );
+};
+
+ReactDOM.render(<MyApp />, document.getElementById('root'));
+```