Start Chapter 8. Using Inheritance

8-using-inheritance/examine-prototype.js

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+class Counter {}
+
+const counter1 = new Counter();
+const counter2 = new Counter();
+
+const counter1Prototype = Reflect.getPrototypeOf(counter1);
+const counter2Prototype = Reflect.getPrototypeOf(counter2);
+
+console.log(counter1 === counter2); // false
+console.log(counter1Prototype === counter2Prototype); // true
+// Objects are different, but they share their prototypes

8-using-inheritance/using-inheritance.md

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+# Chapter 8. Using Inheritance
+
+JavaScript implements **prototypal** inheritance
+
+## Understanding Prototypal Inheritance
+
+- Prototypal inheritance is implemented using delegation
+- Delegation is better than inheritance
+- Instead of relying on base class or superclass, prototypal inheritance relies on an object next in the chain to serve as its base
+- Prototypal inheritance is dynamic which allows altering object that serves as the base at runtime
+- Base object is called the object's prototype
+
+## Prototype Chain
+
+- Object chaining
+- `Reflect.getPrototypeOf`