Organize common code

1 files changed, 18 insertions, 0 deletions

diff --git a/modern/src/common/util/usePersistedState.js b/modern/src/common/util/usePersistedState.js
new file mode 100644
index 00000000..8bc4401f
--- /dev/null
+++ b/modern/src/common/util/usePersistedState.js
@@ -0,0 +1,18 @@
+import { useEffect, useState } from 'react';
+
+export const savePersistedState = (key, value) => {
+  window.localStorage.setItem(key, JSON.stringify(value));
+};
+
+export default (key, defaultValue) => {
+  const [value, setValue] = useState(() => {
+    const stickyValue = window.localStorage.getItem(key);
+    return stickyValue ? JSON.parse(stickyValue) : defaultValue;
+  });
+
+  useEffect(() => {
+    savePersistedState(key, value);
+  }, [key, value]);
+
+  return [value, setValue];
+};