Learning Functional Programming in Go

Nums revisited

Remember those four numerics types that we implemented a Sum method for without generics? Let's revisit that code and see if we can improve our code base now that we know about gen:

cd <DEVDIR>/learn-fp-go/4-purely-functional/ch11-functor-monoid/04_generics_nums. initglide-update

Note that we need to run glide-update so that the vendors directory will be created for us. It will first be placed in our GOPATH so that when we run the next command, the gen package and its dependencies will go in our vendors directory rather than our project’s src directory:

go get github.com/clipperhouse/gen

Now, let's cd to ~/dev/04_generics_nums/src/num and run gen:

cd src/num;gen;cd -

We can see that gen created four files, one for each slice ...