scala the language matters training

high-order-function.scala

//-------------------------------------//
//  readFile is a high order function  //
//  which can take another function    //
//  as parameter                       //
//-------------------------------------//

def using[T](f: File)(handler: FileInputStream => T): T = {
  val resource = new java.io.FileInputStream(f)
  try {
    handler(resource)
  } finally {
      resource.close()
  }
}