I've been learning Swift for the last couple weeks on the weekends and I understand, from what I've read, that functions are basically closures. But, this confuses me because obviously a feature thats 100% redundant wouldn't be implemented, so when should you use closures vs functions? Are there times you can only use closures in Swift, or can you always use them interchangeably?
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They are not totally redundant. Major difference is a convenience of writing and the capability to name parameters or the func itself. This improves largely readabilty of code.
We could say closures are a stripped down version of func. But they are functionally equivalent.
See more details here: https://medium.com/@anuj.rai2489/closure-vs-function-vs-protocol-in-swift-94d0ecd03406
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Ptit-Xav
Add a CommentEach time you have a closure you can put a function. If code is called only once, it may not worth using a function rather than just writing the closure. If the same code is called many times may be a function will be better for maintenance.