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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Interfaces
The feature that we will miss the most when developing large-scale web applications with JavaScript is probably interfaces. We have seen that following the SOLID principles can help us to improve the quality of our code, and writing good code is a must when working on a large project. The problem is that if we attempt to follow the SOLID principles with JavaScript, we will soon realize that without interfaces, we will never be able to write SOLID OOP code. Fortunately for us, TypeScript features interfaces.
Traditionally, in OOP, we say that a class can extend another class and implement one or more interfaces. An interface can implement one or more interfaces and cannot extend another class or interface. Wikipedia's definition of interfaces ...
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