add localStorage functions

utils/localStorageFunctions.js

@@ -0,0 +1,44 @@
+/**
+ * Keys used for localStorage.
+ */
+export const storageKeys = {
+   challengeFilters: "challenge-filters",
+   challengeSearch: "challenge-search"
+};
+
+/**
+ * Get the JSON parsed value by key from localStorage. If no value is found,
+ * a default value can optionally be used as the return.
+ * @param {string} key localStorage key
+ * @param {any} defaultValue default value to return if no value was found
+ * @returns {any}
+ */
+export function getStorage(key, defaultValue) {
+   let value = JSON.parse(localStorage.getItem(key));
+   if (value == null) value = defaultValue ?? undefined;
+   return value;
+}
+
+/**
+ * Sets the JSON stringified value of key into localStorage.
+ * @param {string} key
+ * @param {any} value
+ */
+export function setStorage(key, value) {
+   localStorage.setItem(key, JSON.stringify(value));
+}
+
+/**
+ * Removes the JSON value associated with key from localStorage.
+ * @param {string} key
+ */
+export function removeStorage(key) {
+   localStorage.removeItem(key);
+}
+
+/**
+ * Clears all values from localStorage. Be careful using this. ❤️
+ */
+export function clearStorage() {
+   localStorage.clear();
+}