scala - 如何在 Scala 中使用映射并接收索引？

Question

是否有任何内置的列表/序列，其行为类似于map并提供元素的索引？

Answer 1

我相信您正在寻找 zipWithIndex？

scala> val ls = List("Mary", "had", "a", "little", "lamb")
scala> ls.zipWithIndex.foreach{ case (e, i) => println(i+" "+e) }
0 Mary
1 had
2 a
3 little
4 lamb

来自:http://www.artima.com/forums/flat.jsp?forum=283&thread=243570

您还可以使用以下变体:

for((e,i) <- List("Mary", "had", "a", "little", "lamb").zipWithIndex) println(i+" "+e)

或者:

List("Mary", "had", "a", "little", "lamb").zipWithIndex.foreach( (t) => println(t._2+" "+t._1) )