从scala.collection.immutable.Iterable [String]中删除第一个和最后一个元素

Question

我试图改变我从中获取价值的方式Form,但在某些地方停留

val os= for {
  m <- request.body.asFormUrlEncoded
  v <- m._2
} yield v

os是scala.collection.immutable.Iterable[String]当我打印控制台

os map println

安慰

sedet impntc
sun
job
03AHJ_VutoHGVhGL70

我想从中删除第一个和最后一个元素.

Answer 1

用于drop从前面dropRight拆下并从末端卸下.

def removeFirstAndLast[A](xs: Iterable[A]) = xs.drop(1).dropRight(1)

例:

removeFirstAndLast(List("one", "two", "three", "four")) map println

输出:

two
three

Answer 2

另一种方法是使用slice.

val os: Iterable[String] = Iterable("a","b","c","d")
val result = os.slice(1, os.size - 1) // Iterable("b","c")