canImport()compiler condition do?
Suggested approach: You should get straight to the point and say that
canImport() returns true if a module such as UIKit can be imported, then provide a practical example such as it allowing us to write code that does one thing using UIKit on iOS, and another thing using AppKit on macOS.
Estimated difficulty: Easy
guardkeyword in Swift?
deferkeyword in Swift?
#if swiftsyntax do?
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