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switch used as an expression

if used as an expression

better compactMap

lazy + private(set)

guard statements
![concise [weak self]](https://images.squarespace-cdn.com/content/v1/63139bb1e1a1a078e071f30c/1680524833793-K3XZ7TW079X52BH9TU8P/47763071-5699-4e47-843d-6ab077117565.gif)
concise [weak self]

omit return keyword

iOS version dropped reminder

ResultBuilder + local constant

LazySequence

generic extensions

raw strings

multiline String

XCTest + try!

orEmpty

isNilOrEmpty

if-else vs switch

variadic arguments

CaseIterable
