For many developers, inversion of control (IoC) is a fuzzy concept, with little or no application in the real world. In the best of cases, it’s considered just a plain equivalent of dependency injection (DI). The IoC = DI equation is only true, though, when both sides reference inverting the control of dependency management. While dependency injection is actually a well-known form of IoC, the truth is that IoC is a much broader software design paradigm, which can be implemented through several patterns. In this article we’ll be taking a look at how dependency injection, the observer pattern, and the template method pattern implement inversion of control.
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