In Scala, how do I define an anonymous function which takes a variable number of arguments?
scala> def foo = (blah:Int*) => 3
<console>:1: error: ')' expected but identifier found.
def foo = (blah:Int*) => 3
^
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1 Answer
It looks like this is not possible. In the language specification in chapter 6.23 Anonymous functions the syntax does not allow an * after a type. In chapter 4.6 Function Declarations and Definitions after the type there can be an *.
What you can do however is this:
scala> def foo(ss: String*) = println(ss.length)
foo: (ss: String*)Unit
scala> val bar = foo _
bar: (String*) => Unit = <function1>
scala> bar("a", "b", "c")
3
scala> bar()
0
1 Comment
UnitasBrooks
This doesn't work for me in Scala 2.12: <console>:13: error: too many arguments (3) for method apply: (v1: Seq[String])Unit in trait Function1