initial commit

frontend/src/hooks/useLocalStorage.js

@@ -0,0 +1,30 @@
+import { useState } from 'react';
+
+const useLocalStorage = (key, initialValue) => {
+  // Get from local storage then parse stored json or return initialValue
+  const [storedValue, setStoredValue] = useState(() => {
+    try {
+      const item = window.localStorage.getItem(key);
+      return item ? JSON.parse(item) : initialValue;
+    } catch (error) {
+      console.error(`Error reading localStorage key "${key}":`, error);
+      return initialValue;
+    }
+  });
+
+  // Return a wrapped version of useState's setter function that persists the new value to localStorage
+  const setValue = (value) => {
+    try {
+      // Allow value to be a function so we have the same API as useState
+      const valueToStore = value instanceof Function ? value(storedValue) : value;
+      setStoredValue(valueToStore);
+      window.localStorage.setItem(key, JSON.stringify(valueToStore));
+    } catch (error) {
+      console.error(`Error setting localStorage key "${key}":`, error);
+    }
+  };
+
+  return [storedValue, setValue];
+};
+
+export default useLocalStorage;