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aoiroaoino/splitN.scala

Created August 2, 2013 13:04
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任意の要素数でListを区切るメソッド
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splitN.scala
def splitN[A](list: List[A], index: Int): List[List[A]] = if(list.length == 0) List() else if(index < 1) List(list) else List(list.take(index)) ::: splitN[A](list.drop(index), index)
scala> splitN(List(1,2,3,4,5,6,7,8,9,0), 3)
rest0: List[List[Int]] = List(List(1, 2, 3), List(4, 5, 6), List(7, 8, 9), List(0))
scala> splitN(List("Red", "Green", "Yellow", "Blue"), 1)
res1: List[List[java.lang.String]] = List(List(Red), List(Green), List(Yellow), List(Blue))
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