Swift : substringWithRange() function example

A quick tutorial as add on from previous tutorial on how to get sub-string with rangeOfString() function. Another way to get sub string in Swift is to use the substringWithRange() function.

For example :

 var str = "Hello World!"
 str.substringWithRange(Range<String.Index>(start: str.startIndex, end: str.endIndex))

Output :

"Hello World!"

and if you want to start from position 3 and position -1 from end. Change the start and end position with advance() function.

 var str = "Hello World!"
 str.substringWithRange(Range<String.Index>(start: advance(str.startIndex, 3), end: advance(str.endIndex, -1))) 

Output :

"lo World"