Functional Programming exercise (Lambda function)

Question

Happy new year everyone!

I have the following exercise for my Programming courses:

Write a class named Imbauba. Class must contain the following method:

A public method named dit which has a parameter (Function Float, Float type) named dawnward and returns Fuction Float, Float result. Lambda function which is returned must contain the value of dawnward divided by 67

   public class Imbauba {
        public Function<Float, Float> dit(Function<Float, Float> dawnward) {
             Function<Float, Float> sss = (a) -> dawnward / 67F;
             return sss;
        }
   }

This is what I've done so far. I have no clue how to continue. Can anyone guide me close to the solution? Thanks in advance

Answer 1

You need to call the method on the Function . There is no funky syntaz to call the "function" of a functional interface . Something like:

         Function<Float, Float> sss = (a) -> dawnward.apply(a) / 67F;

@VLAZ mentions andThen in the comments. compose does the same thing in the opposite order. I think they are detrimental to readability, and are only really useful if it avoids creating another lambda expression (and even then I'd prefer not to bother).