Scala数组切片与元组

Question

我尝试Array[Double]使用该slice方法切片1D .我写了一个方法,它将开始和结束索引作为元组返回(Int,Int).

  def getSliceRange(): (Int,Int) = {
    val start =   ...
    val end =  ...
    return (start,end)
  }

我怎样才能getSliceRange直接使用返回值？

我试过了:

myArray.slice.tupled(getSliceRange())

但这给了我一个编译错误:

Error:(162, 13) missing arguments for method slice in trait IndexedSeqOptimized;
follow this method with `_' if you want to treat it as a partially applied function
  myArray.slice.tupled(getSliceRange())

Answer 1

我认为问题是隐式转换Array为ArrayOps(slice来自GenTraversableLike).

val doubleArray = Array(1d, 2, 3, 4)

(doubleArray.slice(_, _)).tupled

Function.tupled[Int, Int, Array[Double]](doubleArray.slice)

(doubleArray.slice: (Int, Int) => Array[Double]).tupled