indices(String) error

(Sorry about that—LCS has the right answer below. Strings are no longer a collection type in Swift 2, and the global indices function has become a property on collections like String.characters.)

That sample code is quite a collection of deprecated syntax, and somehow they missed it when they updated the book to Swift 2.0!

(from The Swift Programming Language > Language Guide > Strings and Characters > Accessing and Modifying a String)

The indices() function is gone too, and the print() function has changed to take over from println() and doesn't work so well in playgrounds when used incrementally, so the sample code would now probably be something like this:

let greeting = "Guten Tag"

var str = ""
for index in greeting.characters.indices {
    str = str + "\(greeting.characters[index]) "
}

print(str)
// prints "G u t e n   T a g "

I would write it like this:

let greeting = "Guten Tag"
var str = ""
  for char in greeting.characters {
  str = str + "\(char) "
}
print(str)

or like this:

let greeting = "Guten Tag" + "\n"
for char in greeting.characters {
    print(char, appendNewLine: false)
}

Of course, you have to click on the 'Show Debug Area' button in the top right of the playground window to see the printed results.

thanks for all.

indices(greeting.characters) is correct

another way:

for index in greeting.startIndex..<greeting.endIndex {

println(greeting[index])

}