Catch conditions

first.swift

func doSomething(object: AnyObject) {
  guard let object = object as? String where object.hasPrefix("hel") else {
    return
  }
  
  print(object.uppercaseString)
}

doSomething("hello")

func doSomethingWithBool(bool: Boolean, name: String?) {
  guard bool, let name = name else {
    return
  }
  
  print("bool is true and name \(name)")
}

doSomethingWithBool(true, name: "damien")

func multiUnwrap(URL: NSURL?) {
  guard let URL = URL, host = URL.host, path = URL.path else {
    return
  }
  
  print(URL, host, path)
}