Application modularity requires that chunks of code performing the same task in several Angular components be factored out into separate classes. Actually, to improve software maintainability, it is best practice to factor out all code chunks that might be useful to other Angular component classes even when these other components have not yet been created. As a consequence, Angular components should only contain code that is specific to their internal peculiarities, that is, the code that defines their interaction with the user. Code that defines business logic, and localization rules, as well as code that handles application-level services, must be factored out in various specialized classes, which are usually ...
Services and Dependency Injection
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