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The best place to view the code associated with this course is in the online book (https://go.asim.dev/angular-book) via the book if a lecture has code associated with it, it then also has a link to a stackblitz instance so you can run and edit the code sample online.
A token can be either a string, a class or an instance of InjectionToken.
String tokens can cause name clashes so we prefer to use InjectionTokens instead.
In the next lecture, we will look at how we actually configure DI in Angular.