Compose and andThen methods

Question

I\'m following the tutorial Pattern matching & functional composition on Scala compose and andThen methods. There\'s such an example:

Answer 1

From compose documentation:

Composes two instances of Function1 in a new Function1, with this function applied last.

so you should write

scala> val ummThenAhem = (addAhem _).compose(addUmm _)
ummThenAhem: String => java.lang.String = 

to treat addAhem and addUmm as partially applied functions (i.e function1)

scala> addAhem _
res0: String => java.lang.String =