How to take multiple functions as variable arguments in Scala ?

Question

In order to take multiple variables as arguments for data types in Scala we can write something as :

def test(args: String*)

How can we take multiple functions as arguments in the same spirit? (The Syntax?) I could not find anything after much googling.

Travis Brown · Accepted Answer · 2014-08-11 17:57:25Z

8

Functions in Scala are values with types like any other values, and A => B (or, equivalently, Function1[A, B]) is the type of a function from A to B. So if for example you want to take a variable number of functions from strings to strings, you could write the following:

def test(funcs: (String => String)*) = ???

You could actually skip the internal parentheses and write funcs: String => String*, but I personally find the precedence there a bit unclear.

answered Aug 11, 2014 at 17:57

Travis Brown

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2 Comments

Gabriele Petronella Over a year ago

For completeness: def test(args: Function1[String, String]*)

Randall Schulz Over a year ago

Always keep in mind the option to declare a type alias. In this case, e.g., type Str2Str = String => String then def test(funcs: Str2Str*).

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