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Learning TypeScript 2.x - Second Edition
book

Learning TypeScript 2.x - Second Edition

by Remo H. Jansen
April 2018
Beginner content levelBeginner
536 pages
13h 21m
English
Packt Publishing
Content preview from Learning TypeScript 2.x - Second Edition

SOLID – the dependency inversion principle

The dependency inversion (DI) principle states, Depend upon abstractions. Do not depend upon concretions. In the LSP, we implemented a class named FavouritesController. In the example, it was possible to replace an implementation of PersistanceServiceInterface with another without having to perform any additional change to FavouritesController.

We followed the DI principle, as FavouritesController has a dependency upon PersistanceServiceInterface (abstraction):

The preceding can be implemented as follows:

class FavouritesController { private _persistanceService: PersistanceServiceInterface; public ...
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Publisher Resources

ISBN: 9781788391474Supplemental Content