Swift

Swift is an open source programming language created in 2014 by Chris Lattner.

Source code:

git clone https://github.com/apple/swift

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Swift is a general-purpose, multi-paradigm, compiled programming language developed by Apple Inc. for iOS, macOS, watchOS, tvOS, and Linux. Swift is designed to work with Apple's Cocoa and Cocoa Touch frameworks and the large body of existing Objective-C (ObjC) code written for Apple products. Read more on Wikipedia...

Swift website
Swift downloads page
Swift Wikipedia page
Swift is developed on GitHub and has 60,145 stars
Watch the history of the Swift repo visualized with Gource
Swift docs
Swift mailing list
There are at least 1,044,892 Swift repos on GitHub
Swift first developed in Apple
Swift on Twitter
The Google BigQuery Public Dataset GitHub snapshot shows 25k users using Swift in 43k repos on GitHub
Check out the 375 Swift meetup groups on Meetup.com.
There are 93,491 members in the Swift subreddit
There are 690 Project Euler users using Swift
In the 2021 StackOverflow developer survey Swift programmers reported a median salary of $58,911. 5% of respondents reported using Swift. 4,204 programmers reported using Swift, and 6,353 said they wanted to use it
Explore Swift snippets on Rosetta Code
Swift ranks #20 in the TIOBE Index
Swift LSP implementation
CodeMirror package for syntax highlighting Swift
Monaco package for syntax highlighting Swift
Pygments supports syntax highlighting for Swift
GitHub supports syntax highlighting for Swift
There is a central package repository for Swift
Release Notes for Swift
Official Blog page for Swift
Indeed.com has 2,043 matches for "swift developer".
See also: (18 related languages)Linux, FreeBSD, C#, CLU, D, Haskell, Objective-C, Python, Ruby, Rust, iOS, LLVM IR, C, Smalltalk, Java, Unicode, Android, Kotlin

Example from Compiler Explorer:

// Type your code here, or load an example.
func square(n: Int) -> Int {
    return n * n
}

Example from Riju:

print("Hello, world!")

Example from hello-world:

print("Hello World")

Example from the Hello World Collection:

// Hello world in Swift

println("Hello, world!")

Example from Linguist:

println("Hello, world")

Example from Wikipedia:

var someSortOfPrintableObject: SupportsToString
...
print(someSortOfPrintableObject.toString())

Swift Keywords

associatedtype class deinit enum extension func import init inout internal let operator private protocol public static struct subscript typealias var break case continue default defer do else fallthrough for guard if in repeat return switch where while as catch dynamicType false is nil rethrows super self Self throw throws true try #column #file #function #line #available #column #else#elseif #endif #file #function #if #line #selector associativity convenience dynamic didSet final get infix indirect lazy left mutating none nonmutating optional override postfix precedence prefix Protocol required right set Type unowned weak willSet

Feature	Supported	Token	Example
Binary Literals	✓		// 0b[01_]+
Integers	✓		// [0-9][0-9_]*
Floats	✓		// [0-9][0-9_](\.[0-9_]+[eE][+\-]?[0-9_]+\|\.[0-9_]\|[eE][+\-]?[0-9_]+)
Hexadecimals	✓		// 0x[0-9a-fA-F_]+
Octals	✓		// 0o[0-7_]+
Conditionals	✓
Access Modifiers	✓
Switch Statements	✓
Exceptions	✓
Classes	✓
While Loops	✓
Booleans	✓	true false
Case Sensitivity	✓
MultiLine Comments	✓	/* */	/* A comment */
Print() Debugging	✓	print
Line Comments	✓	//	// A comment
Type Inference	✓
Operator Overloading	✓
Interfaces	✓		protocol MyProtocol { init(parameter: Int) var myVariable: Int { get set } var myReadOnlyProperty: Int { get } func myMethod() func myMethodWithBody() } extension MyProtocol { func myMethodWithBody() { // implementation goes here } }
File Imports	✓		import UIKit import UIKit.UITableViewController let tvc = UITableViewController() let vc = UIViewController() let label = UILabel()
Comments	✓
Single Dispatch	✓
Strings	✓	"	"hello world"
Assignment	✓		let label = UILabel()
Case Insensitive Identifiers	X
Semantic Indentation	X
Variable Substitution Syntax	X

Language features