Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Closures in Swift 2 First Class Functions Higher Order Functions

Tyler Travis
Tyler Travis
2,429 Points

What am I doing wrong? Perhaps I am just misunderstanding the question.

Any feedback at all is appreciated!

functions.swift
// Enter your code below

extension String {

  func modify (input: (String) -> String) -> String {

    var result = input(self)
    return result
  }
}