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Swift has a modern syntax that eliminates the verbosity of programming languages such as Objective-C. For instance, the following code example shows an Objective-C class with a property and method. Objective-C classes are defined in two separate files (interface and implementation). The VerboseClass.h file defines an interface as a subclass of the NSObject class. It defines a property, ourArray, and a method, aMethod.

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Cover of Swift 3 Functional Programming

Note

Swift 3 - take a look section / ch 4 --- URL