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by hota_mazi
3553 days ago
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I agree there is a dichotomy between objects you inject and objects you don't but I think your characterization is incorrect: what decides if an object needs to be injected is not tied to its type but to its role. Sometimes, I inject integers or strings or other primitive types. Other times, I pass them explicitly. The decision is made based on whether that object is a runtime object (i.e. decided by the user or some other factor that cannot be known when the app starts) or a dependency that's decided early and won't change through the life of the app. Either way, this aspect is independent of the point I was making above and which is that functional code is not inherently easier to test than procedural code. |
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That's true, you can certainly just write procedural code in functional languages and there's no benefit. However, you also have the ability to structure code in a way that is testable and is actually more structured than the equivalent OOP style. By which I mean: the operations on the dependencies are more constrained (since they can't be replaced or duplicated, etc).