How to save that

Question

I am self learning haskell from here. I do not understand anything when the author says "Save this as baby.hs". What I have to save and how I can save that?

Answer 1

1. Open your favorite text editor
2. Type: doubleMe x = x + x
3. save the file as baby.hs
4. go to the directory where you saved the file and launch ghci
5. type: :l baby