swift completion handlers

completion.swift

//Create a Completion Handler
func isTextValid(input: String, completion: (result: Bool) -> Void) {
  if (input == "Vea Software") {
    completion(result: true)
  } else {
    completion(result: false)
  }
})
 
//Call a Completion Handler
isTextValid("Vea Software", { (result) -> Void in
  if (result == true) {
    println("working")
  }else {
    println("not working")
  }
})