What does “case” mean without switch statement in Swift?

Question

I ran into this code which is part of a Swift implementation of a linked list in the Swift Algorithm Club. Throughout the implementation the author uses case let fo

Answer 1

Swift 2 took the pattern paradigm from switch/case statements and allowed it to be used in other contexts (if, while and so on).

So now, rather than just simple comparisons, you can use these pattern matching comparisons in conditionals as well.

As one example, rather than:

if (a >= 0) and (a <= 255)

you can instead use:

if case 0...255 = a

That's a trivial example but it can become much more useful once you realise the rather large number of pattern matching options available to you.