Swift equivalent for MIN and MAX macros

by

min and max are defined in Swift:

func max<T : Comparable>(x: T, y: T, rest: T...) -> T
func min<T : Comparable>(x: T, y: T, rest: T...) -> T

and used like so:

let min = min(1, 2)
let max = max(1, 2)

See this great writeup on documented & undocumented built-in functions in Swift.

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