Functional programming - hmm sounds interesting - but I have actually no clue about this topic? ... Well, then you are welcome to read this article...
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Great article!
Your "normal" function is in fact pure too: the data it is referencing might be not an argument, but is constant, it wont change making it pure too.
Thank you Jan, actually that’s true, yes. Maybe you can suggest a better example? I would be really curious if you got a better one in mind.