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Three compelling attributes
Modernity
Swift contains a large number of modern language features.
Closures
Extensions
Pattern-matching
switch statements
Generics
Similar to Scala
Power
Despite being new, Swift can be used to build powerful apps
Access to the entire
Objective-C runtime
No need to wait for libraries
to be ported to Swift
Interoperates with
Objective-C bi-directionally
Safety
Swift is designed to be a safe language.
Very strongly typed
Object references usually
cannot be null
Manning, Jon, Paris Buttfield-Addison, and Tim Nugent. Swift Development with Cocoa. O'Reilly Media, 2014