18 lines
525 B
Scala
18 lines
525 B
Scala
def lengthStrings(strings: List[String]): List[Int] = {
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strings map (s => s.length)
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}
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def dup[T](elem: T, n: Int): List[T] = {
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(1 to n).toList map (_ => elem)
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}
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def dot(list1: List[Int], list2: List[Int]): List[Int] = {
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list1 zip list2 map (p => p._1 * p._2)
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}
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assert(lengthStrings(List("How","long","are","we?")) == List(3, 4, 3, 3))
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assert(dup("foo", 5) == List("foo", "foo", "foo", "foo", "foo"))
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assert(dup(List(1,2,3), 2) == List(List(1,2,3), List(1,2,3)))
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assert(dot(List(1,2,3), List(2,4,3)) == List(2,8,9)) |