feat: add tutorial of local storage

Author: MikhailMasny

index.html

@@ -31,5 +31,6 @@
     <!-- <script src="javascript/module.js"></script> -->
     <!-- <script src="src/babel.js"></script> -->
     <!-- <script src="javascript/reflect.js"></script> -->
+    <!-- <script src="javascript/local-storage.js"></script> -->
 </body>
 </html>

javascript/local-storage.js

@@ -0,0 +1,25 @@
+const someValue = 123;
+
+localStorage.removeItem("number");
+console.log(`Number: ${localStorage.getItem("number")}`);
+localStorage.setItem("number", someValue.toString());
+console.log(`Number: ${localStorage.getItem("number")}`);
+localStorage.clear();
+
+const someObject = {
+    prop1: "Property One.",
+    prop2: 1
+}
+
+localStorage.setItem("someObject", JSON.stringify(someObject));
+const localStorageObject = localStorage.getItem("someObject");
+console.log(`someObject is ${typeof localStorageObject}`);
+const object = JSON.parse(localStorageObject);
+console.log(object);
+
+
+
+// windows.onstorage = () => {}
+window.addEventListener("storage", event => {
+    console.log(event);
+});