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Apple is offering a developer preview of version 3.0 of its Swift programming language, used for iOS and MacOS development and also available for Ubuntu Linux. Swift 3 features better translation of Objective-C APIs into Swift, modernization of debugging identifiers and playground literals, and a new model for collections and indices.
Implemented Swift Evolution Proposals
The following Swift Evolution proposals are newly implemented in Swift 3.0 Preview 1:
- SE-0002: Removing currying
funcdeclaration syntax - SE-0003: Removing
varfrom Function Parameters - SE-0004: Remove the
++and--operators - SE-0005: Better Translation of Objective-C APIs Into Swift
- SE-0006: Apply API Guidelines to the Standard Library
- SE-0007: Remove C-style for-loops with conditions and incrementers
- SE-0008: Add a Lazy flatMap for Sequences of Optionals
- SE-0016: Adding initializers to Int and UInt to convert from UnsafePointer and UnsafeMutablePointer
- SE-0017: Change
Unmanagedto useUnsafePointer - SE-0019: Swift Testing
- SE-0023: API Design Guidelines
- SE-0028: Modernizing Swift’s Debugging Identifiers (__FILE__, etc)
- SE-0029: Remove implicit tuple splat behavior from function applications
- SE-0031: Adjusting inout Declarations for Type Decoration
- SE-0032: Add
first(where:)method toSequenceType - SE-0033: Import Objective-C Constants as Swift Types
- SE-0034: Disambiguating Line Control Statements from Debugging Identifiers
- SE-0037: Clarify interaction between comments & operators
- SE-0039: Modernizing Playground Literals
- SE-0040: Replacing Equal Signs with Colons For Attribute Arguments
- SE-0043: Declare variables in ‘case’ labels with multiple patterns
- SE-0044: Import as Member
- SE-0046: Establish consistent label behavior across all parameters including first labels
- SE-0047: Defaulting non-Void functions so they warn on unused results
- SE-0048: Generic Type Aliases
- SE-0049: Move @noescape and @autoclosure to be type attributes
- SE-0053: Remove explicit use of
letfrom Function Parameters - SE-0054: Abolish
ImplicitlyUnwrappedOptionaltype - SE-0055: Make unsafe pointer nullability explicit using Optional
- SE-0057: Importing Objective-C Lightweight Generics
- SE-0059: Update API Naming Guidelines and Rewrite Set APIs Accordingly
- SE-0061: Add Generic Result and Error Handling to autoreleasepool()
- SE-0062: Referencing Objective-C key-paths
- SE-0064: Referencing the Objective-C selector of property getters and setters
- SE-0065: A New Model For Collections and Indices
- SE-0066: Standardize function type argument syntax to require parentheses
- SE-0069: Mutability and Foundation Value Types
- SE-0070: Make Optional Requirements Objective-C-only
- SE-0071: Allow (most) keywords in member references
- SE-0085: Package Manager Command Names
- SE-0094: Add sequence(first:next:) and sequence(state:next:) to the stdlib
Downloads
Apple (Xcode)
Swift 3.0 Preview 1 is available for free as part of Xcode 8 beta 1.
Linux (Ubuntu 14.04 and Ubuntu 15.10)
Official binaries for Ubuntu 14.04 and Ubuntu 15.10 are available for download on Swift.org.