Added LocalStorage and SessionStorage Utilities

Added storage.js

Author: BEASTSHRIRAM

Modern Development/ECMASCript 2021/Storage Utilities/README.md

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+# Storage Utilities
+
+Tiny helpers for LocalStorage and SessionStorage.
+
+- `storage.js` - lightweight wrapper: set/get/remove/clear/keys
+- `storage-examples.js` - quick usage
+
+Use a prefix to avoid colliding with other data.

Modern Development/ECMASCript 2021/Storage Utilities/storage-examples.js

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+// Small usage examples
+// local store with prefix
+const appStore = localStore('myapp:');
+appStore.set('user', { id: 1, name: 'Alex' });
+console.log(appStore.get('user')); // {id:1, name:'Alex'}
+
+// session store
+const sess = sessionStore('sess:');
+sess.set('temp', { foo: 'bar' });
+console.log(sess.get('temp'));
+
+// remove and keys
+appStore.remove('user');
+console.log(sess.keys());

Modern Development/ECMASCript 2021/Storage Utilities/storage.js

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+// Minimal storage helpers for localStorage / sessionStorage
+function createStorage(storage, prefix = '') {
+  const key = k => prefix + k;
+  return {
+    set(k, v) {
+      try { storage.setItem(key(k), JSON.stringify(v)); } catch (e) { /* ignore */ }
+    },
+    get(k) {
+      try { const v = storage.getItem(key(k)); return v ? JSON.parse(v) : null; } catch (e) { return null; }
+    },
+    remove(k) {
+      try { storage.removeItem(key(k)); } catch (e) { }
+    },
+    clear() {
+      try { if (!prefix) storage.clear(); else {
+        // remove keys that start with prefix
+        for (let i = storage.length - 1; i >= 0; i--) {
+          const k = storage.key(i); if (k && k.indexOf(prefix) === 0) storage.removeItem(k);
+        }
+      }} catch (e) {}
+    },
+    keys() {
+      const out = [];
+      for (let i = 0; i < storage.length; i++) {
+        const k = storage.key(i); if (k && (!prefix || k.indexOf(prefix) === 0)) out.push(prefix ? k.slice(prefix.length) : k);
+      }
+      return out;
+    }
+  };
+}
+
+const localStore = (prefix) => createStorage(window.localStorage, prefix);
+const sessionStore = (prefix) => createStorage(window.sessionStorage, prefix);
+
+// Export for Node/test environments (if needed)
+if (typeof module !== 'undefined' && module.exports) module.exports = { createStorage, localStore, sessionStore };