February 2019
Beginner
694 pages
18h 4m
English
Content preview from Mastering TypeScript 3 - Third Edition
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Open-closed
The open-closed principle states that an object should be open to extension, but closed for modification. In other words, once an interface has been designed for a class, changes over time to this interface should be achieved through inheritance, and not by modifying the interface directly.
Note that if you are writing libraries that are consumed by third-parties through an API, then this principle is essential for API design. An API should always try to ensure backward compatibility, and as such, changes should only be made through a new, versioned release.
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