2-fer is short for two for one. One for you and one for me.
Given a name, return a string with the message:
One for X, one for me.
Where X is the given name.
However, if the name is missing, return the string:
One for you, one for me.
Here are some examples:
|Name||String to return|
|Alice||One for Alice, one for me.|
|Bob||One for Bob, one for me.|
|One for you, one for me.|
|Zaphod||One for Zaphod, one for me.|
Refer to the Installing Elm page for information about installing elm.
The first time you start an exercise, you'll need to ensure you have the appropriate dependencies installed. Thankfully, Elm makes that easy for you and will install dependencies when you try to run tests or build the code.
Execute the tests with:
Automatically run tests again when you save changes:
$ elm-test --watch
As you work your way through the test suite, be sure to remove the
calls from each test until you get them all passing!
It is possible to submit an incomplete solution so you can see how others have completed the exercise.
module Tests exposing (tests) import Expect import String import Test exposing (..) import TwoFer exposing (twoFer) tests : Test tests = describe "Two-fer" [ test "No name given" <| \() -> Expect.equal "One for you, one for me." (twoFer Nothing) , skip <| test "A name given" <| \() -> Expect.equal "One for Alice, one for me." (twoFer (Just "Alice")) , skip <| test "Another name given" <| \() -> Expect.equal "One for Bob, one for me." (twoFer (Just "Bob")) ]
module TwoFer exposing (twoFer) twoFer : Maybe String -> String twoFer name = let companion = name |> Maybe.withDefault "you" in "One for " ++ companion ++ ", one for me."
A huge amount can be learned from reading other people’s code. This is why we wanted to give exercism users the option of making their solutions public.
Here are some questions to help you reflect on this solution and learn the most from it.