What is the more elegant way to remove all characters after specific character in the String object in Swift

Question

What is the more elegant way to remove all characters after specific character in the String object in Swift?

Suppose that I have the following string:

Answer 1

Here is a way to do it:

var str = "str.str"

if let dotRange = str.rangeOfString(".") {
    str.removeRange(dotRange.startIndex..

Update In Swift 3 it is:

var str = "str.str"

if let dotRange = str.range(of: ".") {
  str.removeSubrange(dotRange.lowerBound..