December 2016
Intermediate to advanced
841 pages
17h
English
Content preview from TypeScript: Modern JavaScript DevelopmentBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Applying the SOLID principles
As we have previously mentioned, interfaces are fundamental features when it comes to following the SOLID principles, and we have already put the first two SOLID principles into practice.
We have already discussed the single responsibility principle. Now, we will see real examples of the three remaining principles.
The Liskov substitution principle
The Liskov substitution principle (LSP) states, Subtypes must be substitutable for their base types. Let's take a look at an example to understand what this means.
We will declare a class named PersistanceService, the responsibility of which is to persist some object into some sort of storage. We will start by declaring the following interface:
interface PersistanceServiceInterface ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.