Question

I want to have class that can be instantiated with list, array, seq, set, stack, queue etc.
In my opinion

class A
class B(elems:A*)

should handle such stuff.

This is my solution:

class A
class B(elems:Iterable[A]){
    def this(elem:A) = this(Seq(elem))
}

Can you suggest any improvements?

Answer 1

Any Seq or Array may be passed to a method with repeated parameters by using the : _* ascription:

scala> def m1(strs: String*): Int = { strs.foldLeft(0)(_ + _.length) }
m1: (strs: String*)Int

scala> m1("foo", "bar")
res0: Int = 6

scala> val ss1 = Array("hello", ", ", "world", ".")
ss1: Array[java.lang.String] = Array(hello, , , world, .)

scala> m1(ss1: _*)
res1: Int = 13

scala> val ss2 = List("now", "is", "the", "time")
ss2: List[java.lang.String] = List(now, is, the, time)

scala> m1(ss2: _*)
res2: Int = 12