Swift is a general-purpose, multi-paradigm, compiled programming language developed by Apple Inc. for iOS, iPadOS, macOS, watchOS, tvOS, Linux, and z/OS. Swift is designed to work with Apple's Cocoa and Cocoa Touch frameworks and the large body of existing Objective-C code written for Apple products.
WORKING WITH COLLECTIONS
WRITING FUNCTIONS AND CLOSURES
ORGANIZING WITH CLASSES AND STRUCTURES
FORMALIZING WITH PROTOCOLS AND EXTENSIONS
WORKING WITH XCODE
MAKING A BETTER APP
GOING MOBILE WITH SWIFT