Swift LanguageA fast overview of some features

@wevtimoteo

Technical Features• Cocoa and CocoaTouch

• Build in LLVM compiler

• ARC (Automatic Reference Counting) memory management

• Same runtime as Objective-C (Bridged)

• No pointers

• Static, inferred typing

Objective-c Hello World

Swift Hello World

Emoji Support

Swift Features

• Optional types

• Named/default parameters

• Namespacing

• Functions are first class citizens

Objective-c Bridging

• NSArray == Array

• NSDictionary == Dictionary

• NSNumber == Int, Double, Float

Objective-c Extensions

Swift Extensions

Optionals• Used in situations where value is absent

• Alternative for Objective-c nil passing

• Works in any type

• Can be safely unwrapped (if/else)

Lazy variables

Functions with Multiple Return Values

Immutability

Array Imutability

It's a bug: https://devforums.apple.com/messages/971330#971330

Function currying

Protocols in Objective-c

Protocols in Swift

Auto closures

Enumerators

References• https://developer.apple.com/swift/

• http://swiftlang.eu/

• https://devforums.apple.com/community/tools/languages/swift

• https://speakerdeck.com/lebedev/swift

• https://speakerdeck.com/dictav/swiftwoshao-sidake