从 scala.collection.immutable.Iterable[String] 中删除第一个和最后一个元素
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remove first and last Element from scala.collection.immutable.Iterable[String]
提问by Govind Singh
I am trying to convert my way of getting values from Form, but stuck some where
我正在尝试转换我从 获取值的方式Form，但在某些地方卡住了
val os= for {
m <- request.body.asFormUrlEncoded
v <- m._2
} yield v
osis scala.collection.immutable.Iterable[String]and when i print it in console
os是scala.collection.immutable.Iterable[String]当我打印控制台
os map println
console
安慰
sedet impntc
sun
job
03AHJ_VutoHGVhGL70
i want to remove the first and last element from it.
我想从中删除第一个和最后一个元素。
回答by Chris Martin
Use dropto remove from the front and dropRightto remove from the end.
用于drop从正面dropRight移除和从末端移除。
def removeFirstAndLast[A](xs: Iterable[A]) = xs.drop(1).dropRight(1)
Example:
例子：
removeFirstAndLast(List("one", "two", "three", "four")) map println
Output:
输出：
two
three
回答by Kigyo
Another way is to use slice.
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")
