scala 代码随笔

def myfunc[T](iter: Iterator[T]) : Iterator[(T, T)] = {
  var res = List[(T, T)]() 
  var pre = iter.next 
  while (iter.hasNext) {
    val cur = iter.next; 
    res .::= (pre, cur) 
    pre = cur;
  } 
  res.iterator
}