Modern syntax

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.

The implementation file imports the header class and provides an implementation for aMethod, as shown in the following code:

//  VerboseClass.h 
@interface VerboseClass: NSObject 
@property (nonatomic, strong) NSMutableArray *ourArray; 
- (void)aMethod:(NSMutableArray*)anArray; 
@end 

//  VerboseClass.m 
#import "VerboseClass.h" 

@implementation VerboseClass 
- (void)aMethod:(NSMutableArray*)anArray { 
    self.ourArray = [[NSMutableArrayalloc] initWithArray: @[@"One",      
    @"Two", @"Three"]]; 
} 

A similar functionality in Swift can be achieved as follows:

class ASwiftClass { 
    var ourArray: [String] = [] 

    func aMethod(anArray: [String]) { 
        self.ourArray  = anArray 
    } 
} 

let aSwiftClassInstance = ASwiftClass() 
aSwiftClassInstance.aMethod(anArray: ["one", "Two", "Three"]) 
print(aSwiftClassInstance.ourArray) 

As seen from this example, Swift eliminates a lot of unnecessary syntax and keeps code very clean and readable.