Mastering Swift 3

Subscript values

In the preceding subscript examples, all of the subscripts accepted integers as the value for the subscript; however, we are not limited to integers. In the following example, we will use a String type as the value for the subscript. The subscript will also return a String type:

struct Hello { 
  subscript (name: String) ->String { 
    return "Hello \(name)" 
  } 
} 

In this example, the subscript takes a string as the value within the subscript and returns a message, saying Hello. Let's see how to use this subscript:

var hello = Hello() 
print(hello["Jon"]) 

This example will display the message Hello Jon to the console.