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Not every app is built using best practices. Sometimes you have to try and fix an application that has been poorly maintained for years or even decades. Adding dependency injection and inversion of control is a great example of this kind of situation.
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Even terrible code runs. In fact, lots of terrible code runs in production every day. However, such code is difficult to maintain, horrifying to modify and subject to nasty problems as it ages. Like a messy house, a messy code-base is nowhere that you want to visit, much less a place to live.
