How do I convert an Array[String] to a Set[String]?

问题

I have an array of strings. What's the best way to turn it into an immutable set of strings?

I presume this is a single method call, but I can't find it in the scala docs.

I'm using scala 2.8.1.

回答1:

This method called toSet, e.g.:

scala> val arr = Array("a", "b", "c")
arr: Array[java.lang.String] = Array(a, b, c)

scala> arr.toSet
res1: scala.collection.immutable.Set[java.lang.String] = Set(a, b, c)

In this case toSet method does not exist for the Array. But there is an implicit conversion to ArrayOps.

In such cases I can advise you to look in Predef. Normally you should find some suitable implicit conversion there. genericArrayOps would be used in this case. genericWrapArray also can be used, but it has lower priority.

回答2:

scala> val a = Array("a", "b", "c")
a: Array[java.lang.String] = Array(a, b, c)

scala> Set(a: _*)
res0: scala.collection.immutable.Set[java.lang.String] = Set(a, b, c)

// OR    

scala> a.toSet
res1: scala.collection.immutable.Set[java.lang.String] = Set(a, b, c)

来源：https://stackoverflow.com/questions/5778657/how-do-i-convert-an-arraystring-to-a-setstring