Swift is a new programming language for iOS and OS X apps that builds on the best of C and
Objective-C, without the constraints of C compatibility. Swift adopts safe programming patterns
and adds modern features to make programming easier, more flexible, and more fun. Swift’s
clean slate, backed by the mature and much-loved Cocoa and Cocoa Touch frameworks, is an
opportunity to reimagine how software development works.
Swift feels familiar to Objective-C developers. It adopts the readability of Objective-C’s named
parameters and the power of Objective-C’s dynamic object model. It provides seamless access
to existing Cocoa frameworks and mix-and-match interoperability with Objective-C code.
Building from this common ground, Swift introduces many new features and unifies the
procedural and object-oriented portions of the language.
Swift is friendly to new programmers. It is the first industrial-quality systems programming
language that is as expressive and enjoyable as a scripting language. It supports playgrounds,
an innovative feature that allows programmers to experiment with Swift code and see the
results immediately, without the overhead of building and running an app.
Swift combines the best in modern language thinking with wisdom from the wider Apple
engineering culture. The compiler is optimized for performance, and the language is optimized
for development, without compromising on either. It’s designed to scale from “hello, world” to
an entire operating system. All this makes Swift a sound future investment for developers and
for Apple.Swift is a fantastic way to write iOS and OS X apps, and will continue to evolve with new
features and capabilities.
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