The Swift Programming Language: A Swift Tourhttps://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GuidedTour.html#//apple_ref/doc/uid/TP40014097-CH2-XID_1 by Isofarro • 12 years ago 1 1 12 years agoDEdeveloper.apple.com