Scala用值替换键的序列

Question

我在 Scala 中有一个 seq = (a1, b1, c1, d1)和一个Map [(a1, "Hello"), (b1, "Bye"), (c1, "Down"), (d1, "Over")]

我想通过用值替换键来获得 Seq 并在 Scala 中获得 Final Seq (Hello, Bye, Down, Over)

Answer 1

Scala 的map应该可以完成这项工作。 如果地图中可能缺少某些键，您可以使用collect 。

val a1 = 1;val b1 = 2;val c1 =3;val d1 = 4

val s1 = Seq(a1, b1, c1, d1)
val s2 = Seq(a1, 10, b1, c1, d1)
val m = Map((a1, "Hello"), (b1, "Bye"), (c1, "Down"), (d1, "Over"))

s1 map m        //res0: Seq[String] = List(Hello, Bye, Down, Over)
s2 collect m    //res1: Seq[String] = List(Hello, Bye, Down, Over)