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Services are objects that provide common functionality to support other building blocks in an application, such as directives, components, and pipes. What’s important about services is the way that they are used, which is through a process called dependency injection. Using services can increase the flexibility and scalability of an Angular application, but dependency injection can be a difficult topic to understand. To that end, I start this chapter slowly and explain the problems that services and dependency injection can be used to solve, how dependency injection works, and why you should consider using services in your own projects. In Chapter 20, I introduce some more advanced features that Angular provides for service. Table 19-1 puts services in context.
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- Chapter 19