feat: add tutorial of reflect

Author: MikhailMasny

index.html

@@ -30,5 +30,6 @@
     <!-- <script src="javascript/destructor.js"></script> -->
     <!-- <script src="javascript/module.js"></script> -->
     <!-- <script src="src/babel.js"></script> -->
+    <!-- <script src="javascript/reflect.js"></script> -->
 </body>
 </html>

javascript/reflect.js

@@ -0,0 +1,31 @@
+class FirstClass {
+    constructor(firstField) {
+        this.firstField = firstField;
+    }
+
+    someFunc() {
+        console.log(`Some text here: ${this.firstField}`);
+    }
+}
+
+const firstObject = new FirstClass("12345");
+console.log(firstObject.someFunc());
+
+const secondObject = Reflect.construct(FirstClass, ["54321"]);
+console.log(secondObject.someFunc());
+
+class SecondClass {
+    secondField = "Another text here";
+}
+
+const thirdObject = Reflect.construct(FirstClass, ["123"], SecondClass);
+console.log(thirdObject.__proto__ === FirstClass.prototype);
+console.log(thirdObject.__proto__ === SecondClass.prototype);
+
+Reflect.apply(secondObject.someFunc, { firstField: "000"}, []);
+console.log(Reflect.ownKeys(secondObject));
+
+Reflect.preventExtensions(secondObject);
+secondObject.newField = "Demo";
+console.log(Reflect.isExtensible(secondObject));
+console.log(secondObject);