Reliable JavaScript: How to Code Safely in the World's Most Dangerous Language

CHAPTER 16 Conforming to Interfaces in an Interface-Free Language

WHAT’S IN THIS CHAPTER?            

• Understanding the benefits of interfaces in other languages
• Gaining the benefits of interfaces in JavaScript
• Simplifying consumption of an object with the Interface Segregation Principle
• Producing a registry in which you can define and enforce interfaces

WROX.COM CODE DOWNLOADS FOR THIS CHAPTER

The wrox.com code downloads for this chapter are found at www.wrox.com/go/reliablejavascript on the Download Code tab. The files are in the Chapter 16 download and individually named according to the filenames noted throughout this chapter.

In a 2014 commercial for Google’s business products (https://www.youtube.com/watch?v=bA0Hmhnl1oE), a videoconference is just finishing:

• GOOGLER: So yeah, I think we’re good. I think that about wraps it up. So ...
• WOMAN #1: Great. I’ll send a follow-up email.
• GOOGLER: I don’t ... There’s nothing much to follow up on so I ...
• WOMAN #2: Well, I think we should regroup.
• GOOGLER: We just regrouped. This is the regrouping.
• MAN #1: Cool. I’ll ping you later.
• GOOGLER: You’re pinging me now. What do you want to ping about?
• MAN #2: Next steps?
• GOOGLER: There are no next steps. We just solved them.
• MAN #3: Huh. All right ...

A conversation between a JavaScript programmer and a C# or Java programmer could go much the same way. The JavaScripter throws some objects together and the C# or Java developer keeps insisting, “You can’t do that! The program will fall ...