November 2019
Beginner
804 pages
20h 1m
English
Content preview from Learn TypeScript 3 by Building Web Applications
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The service layer design pattern
One way to improve our design is to introduce a new layer in order to limit the responsibilities of our controller layer. We need something to handle the persistence of our media collections and our controller should be able to delegate those operations.
This new layer can apply the service layer design pattern, which is at the heart of service-oriented design.
The idea is that the service layer contains services that handle specific parts of the functionality of an application. For instance, services can take care of data retrieval (for example, fetching data from a remote location), data persistence, data manipulation/transformation, and more.
As applications grow in size and complexity, having a service ...
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