this post was submitted on 13 Jun 2024
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Learn Programming
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The functions you've called out are higher order functions regularly associated with the functional programming paradigm. "In the first place" for a lot of people would be a functional programming course at a university.
For your specific case, rust (like a few other languages) implements these through iterator programming. There's a section in the rust book that might help.
Apart from academia you learn from experience, including a healthy amount of reading other people's code, just like you did to find out about these functions in the first place!