Functional Programming: A PragPub Anthology

Chapter 25The Many Faces of Swift Functions

by Natasha Murashev

The standard against which Swift is evaluated is Objective-C, which Apple intends to replace with Swift for its developers. Although Objective-C has some strange-looking syntax compared to other programming languages, the method syntax is pretty straightforward once you get the hang of it. Here’s a quick throwback:

+ (void)mySimpleMethod
{
    // class method
    // no parameters
    // no return values
}

- (NSString *)myMethodNameWithParameter1:(NSString *)param1
              parameter2:(NSNumber *)param2
{
    // instance method
    // one parameter of type NSString pointer,
    // one parameter of type NSNumber pointer
    // must return a value of type NSString pointer
 return @"hello, world!"; ...