Question

I am trying to figure out how to use a function as a member of a class, but can not figure out the correct syntax. I get an compilation error:

test.scala:11: error: missing arguments for method extra in class RichString;
follow this method with `_' if you want to treat it as a partially applied function
println("This is".extra);

How would I keep extra as a function defined outside of the class RichString and use it to extend the String class?

Thanks.

test.scala:

class RichString(a: String) {
  def extra(a: String):String
}

def extra(a: String): String = {
  return a+" Extra!";
}

implicit def string2Rich(s: String) = new RichString(s);

println("This is".extra);

Answer 1

Is this what you want?

scala> class RichString(a: String) {
     |   def extra = a + "extra"
     | }
defined class RichString

scala> implicit def enrichString(s: String) = new RichString(s)
enrichString: (s: String)RichString

scala> println("this is".extra)
this isextra