Scala maps -> operator

Question

What does the symbol -> mean in the context of a Map in Scala?

Scala’s Predef class offers an implicit conversion that lets

Answer 1

As Adam said, -> is not scala syntax, it is a method of the class ArrowAssoc. When you write "foo" -> "bar", the compiler inserts a implicit conversion from "foo" to ArrowAssoc instance so that the -> method can be found.

package scala
object Predef {
   class ArrowAssoc[A](x: A) {
       def -> [B](y: B): Tuple2[A, B] = Tuple2(x, y)
      }
      implicit def any2ArrowAssoc[A](x: A): ArrowAssoc[A] =
        new ArrowAssoc(x)
      ...
}

google "“scala rich wrappers” to know more.