Mastering JavaScript by Ved Antani

Author:Ved Antani [Antani, Ved]
Language: eng
Format: azw3, mobi, epub, pdf
Publisher: Packt Publishing
Published: 2016-01-29T16:00:00+00:00

Here, we define a Person and then Child—a child IS-A person. We also copy the cry property of a Person to the cry property of Child. When we try to see this relationship using instanceof, we soon realize that just by copying a behavior, we could not really make Child an instance of Person; aChild instanceof Person fails. This is just copying or masquerading, not inheritance. Even if we copy all the properties of Person to Child, we won't be inheriting from Person. This is usually a bad idea and is shown here only for illustrative purposes. We want to derive a prototype chain—an IS-A relationship, a real inheritance where we can say that child IS-A person. We want to create a chain: a child IS-A person IS-A mammal IS-A animal IS-A object. In JavaScript, this is done using an instance of an object as a prototype as follows:

SubClass.prototype = new SuperClass(); Child.prototype = new Person();

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