How to add ruby-ish property accessors to String in swift that I find myself using a lot

String.swift

extension String {
  var blank: Bool {
    get {
      let trimmed = self.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
      return trimmed.isEmpty
    }
  }
  
  var present: Bool {
    get{
      return !blank
    }
  }
}