this post was submitted on 08 Jul 2023
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Thought you were OP for a second there, as they were talking about composability. Whether it's dependency injection or not depends on what shape your parameters take. If you're doing functional programming and you're passing handlers and connections etc. as params, that's dependency injection. If you're only passing strings and objects and such and the function has to do a bunch of logic to decide how to handle its params, that's not dependency injection.
I think the main reason OOP has a well-known term and pattern for dependency injection is to differentiate these two (out of multiple) options:
However, this becomes less of a pattern in functional programming as you wouldn't make such objects to begin with. In FP, you pass all parameters where a function is invoked, and DI just becomes using generic parameters. You wouldn't instantiate a dependency on each function call after all.
As this is such a minor change, it's not really talked about much and it's not really a pattern,