Interesting behaviour with infix notation
scala
Solution
It gets desugared to this:
println("Unisex names: ".+(boys).intersect(girls))
then according to the `-Xprint:typer` compiler option it gets rewritten like this:
println(augmentString("Unisex names: ".+(boys.toString)).intersect[Any](girls))
where `augmentString` is an implicit conversion from type `String` to `StringOps`, which provides the `intersect` method.
Problem
One sometimes try to get away from your girlfriend by hiding behind your computer screen. However, I find that Scala is sometimes exactly like my girl... This prints the intersection between two lists: ``` val boys = List(Person("John"), Person("Kim"), Person("Joe"), Person("Piet"), Person("Alex")) val girls = List(Person("Jana"), Person("Alex"), Person("Sally"), Person("Kim")) println("Unisex names: " + boys.intersect(girls)) ``` This prints absolutely nothing: ``` val boys = List(Person("John"), Person("Kim"), Person("Joe"), Person("Piet"), Person("Alex")) val girls = List(Person("Jana"), Person("Alex"), Person("Sally"), Person("Kim")) println("Unisex names: " + boys intersect girls) ``` There are no compiler warnings and the statement prints absolutely nothing to the console. Could someone please explain gently (I have a hangover), why this is so.