Subscripts

Subscripts are shortcuts to access the member elements of a collection, list, sequence, or any custom type that implement subscripts. Consider the following example:

struct TimesTable { 
    let multiplier: Int 
    subscript(index: Int) ->Int { 
        return multiplier * index 
    } 
} 

let fiveTimesTable = TimesTable(multiplier: 5) 
print("six times five is \(fiveTimesTable[6])") 
// prints "six times five is 30"