The classical introductory exercise. Just say "Hello, World!".
"Hello, World!" is the traditional first program for beginning programming in a new language or environment.
The objectives are simple:
If everything goes well, you will be ready to fetch your first real exercise.
To complete this exercise, you need to implement the hello
function.
You will find the type signature for hello
already in place,
but it is up to you to define the function.
For installation and learning resources, refer to the exercism help page.
To run the test suite, execute the following command:
stack test
No .cabal file found in directory
You are probably running an old stack version and need to upgrade it.
No compiler found, expected minor version match with...
Try running "stack setup" to install the correct GHC...
Just do as it says and it will download and install the correct compiler version:
stack setup
If you want to play with your solution in GHCi, just run the command:
stack ghci
The exercism/haskell repository on GitHub is the home for all of the Haskell exercises.
If you have feedback about an exercise, or want to help implementing a new one, head over there and create an issue. We'll do our best to help you!
This is an exercise to introduce users to using Exercism http://en.wikipedia.org/wiki/%22Hello,_world!%22_program
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
import Test.Hspec (Spec, it, shouldBe)
import Test.Hspec.Runner (configFastFail, defaultConfig, hspecWith)
import HelloWorld (hello)
main :: IO ()
main = hspecWith defaultConfig {configFastFail = True} specs
specs :: Spec
specs = it "hello" $
hello `shouldBe` "Hello, World!"
module HelloWorld (hello) where
hello :: String
hello = "Hello, World!"
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.
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