Principles of Object-Oriented JavaScript


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S.O.L.I.D the First 5 Principles of Object Oriented Design with JavaScript
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The Principles Of Object-Oriented JavaScript By Nicholas Zakas

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ISBN 13: 9781593275402

Customers who bought this item also bought. Stock Image. Published by No Starch Press We repeat that for the variable water and take a similar path to create a variable basket. After you have added these products to your basket, you finally print out the total amount you have to pay.

Object-oriented programming — the basics

The difference between the two code snippets is obvious. We use classes in OOP as templates for creating objects. You can look at classes like the blueprints for a car. It is only when a factory instantiates the car, however, that you can turn the key and drive. In our use case, we use the Product class to instantiate two objects, bread and water. Of course, those objects need code which you have to provide in the classes. It goes like this:. A class in JavaScript looks like a function, but you use it differently.

The code inside the function is the constructor. This code executes each time an object is instantiated. Each new object stores these values inside it. Furthermore, we can define functions that the object will provide. We define these function by prepending the this keyword which makes them accessible from the outside see Encapsulation.

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S.O.L.I.D the First 5 Principles of Object Oriented Design with JavaScript - Codeforgeek

Notice that the functions have full access to the properties. Instantiating a new Basket object simply generates an empty list of products that the program can fill afterwards.


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Mind the assignment of the properties to the variable this. Unfortunately, you have now given full access to the properties from the outside. So everybody could access and modify it:.

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What would happen if you added validation code to prevent, for example, prices less than zero? Any code that accesses the price property directly would bypass the validation. This could introduce errors that would be difficult to trace. Objects should have exclusive control over their data. The only way to access the data is indirect via the functions written into the objects. Data and processing aka logic belong together.

Constructors and object instances

This is especially true when it comes to larger applications where it is very important that processing data is restricted to specifically-defined places. Done right, OOP produces modularity by design, the holy grail in software development. Looking at the above sample, you can see that it does adhere to the module pattern. TypeScript supports single inheritance.


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There is no formal mechanism for creating an abstract class in TypeScript, although a request to implement abstraction in TypeScript has been issued. Not to worry, for now we can use interfaces as a way to abstract class members. For example, a bank might have an Fee interface their favorite one!

Javascript lesson 8 - object oriented programming principles

When classes implement these interfaces, they must implement all of the members of the interface, as interfaces serve as digital contracts that classes can adhere to. TypeScript enables polymorphism via method overrides as you can see in the example below. In the child classes, we can override these methods and add our own business logic customizations, such as waving a fee if the balance is more than a specified amount. In this case, we overrided the ChargeFee that was originally part of the Fee interface.

Polymorphism is an essential characteristic of OO programming, as code would be quite redundant without it. As you can see, TypeScript enables all four of the primary object oriented programming techniques with easy to use keywords and syntax. TypeScript is a bit of a syntactic sugar sprinkled on top of JavaScript, and it fits in many developer scenarios since OOP is such a popular and reigning paradigm. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account.

Principles of Object-Oriented JavaScript Principles of Object-Oriented JavaScript
Principles of Object-Oriented JavaScript Principles of Object-Oriented JavaScript
Principles of Object-Oriented JavaScript Principles of Object-Oriented JavaScript
Principles of Object-Oriented JavaScript Principles of Object-Oriented JavaScript
Principles of Object-Oriented JavaScript Principles of Object-Oriented JavaScript
Principles of Object-Oriented JavaScript Principles of Object-Oriented JavaScript
Principles of Object-Oriented JavaScript Principles of Object-Oriented JavaScript

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