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A solution is substringFromIndex

let a = "StackOverFlow" let last4 = a.substringFromIndex(a.endIndex.advancedBy(-4)) 

or suffix on characters

let last4 = String(a.characters.suffix(4)) 

code is Swift 2

Swift 3:

In Swift 3 the syntax for the first solution has been changed to

let last4 = a.substring(from:a.index(a.endIndex, offsetBy: -4)) 

Swift 4:

In Swift 4 it becomes more convenient:

let last4 = a.suffix(4) 

The type of the result is a new type Substring which behaves as a String in many cases. However if the substring is supposed to leave the scope where it's created in Apple recommends to create a regular String instance.

let last4 = Sting(a.suffix(4))