Homework solutions for UPenn's CIS 194:
https://keathley.github.io/cis194/lectures.html
On a mac:
# install asdf: https://github.com/asdf-vm/asdf
asdf plugin-add haskell
asdf install haskell 8.0.2
cd cis194
stack setup
stack build
Or through nix:
Install nix following https://nixos.org/nix/download.html
nix-shell
stack setup
stack build
Through most of this course ghci is going to be your best friend. You can start
ghci by simply running: ghci in the root directory of the project. When you want to run load modules
you can use the :load command like so:
λ> :cd src/Cis194
λ> :l Week1
[1 of 1] Compiling Cis194.Week1 ( Week1.hs, interpreted )
Ok, modules loaded: Cis194.Week1.
λ>
You will only have to run the :cd command if you opened ghci in the root of the project. If you open ghci in the 'src/Cis194' directory then you can skip that step.
Occasionally you'll need to load multiple modules. These modules need to be
specified in the proper order. For instance Calc.hs depends on ExprT.hs.
You can load those modules in ghci like so:
λ> :load ExprT Calc
[1 of 2] Compiling Cis194.ExprT ( ExprT.hs, interpreted )
[2 of 2] Compiling Cis194.Calc ( Calc.hs, interpreted )
Ok, modules loaded: Cis194.ExprT, Cis194.Calc.
λ>
Its also possible to check types, kinds an other information about expressions in ghci:
λ> :t 1 + 2
1 + 2 :: Num a => a
λ> :info map
map :: (a -> b) -> [a] -> [b] -- Defined in ‘GHC.Base’
λ> :kind Int
Int :: *
If you want to run the entire test suite you can do so with:
$ stack test
But most of the time you'll want to run tests for the specific assignment you're working on like so:
$ stack test --test-arguments '-m MODULE_NAME'
For instance, if I wanted to run the assignments for Week1 I would say:
$ stack test --test-arguments '-m Week1'
:m +Test.QuickCheck
:l src/Cis194/Hw/Week1.hs
-- define a fx that generates data
let negInts = choose(-10000000, -1)
-- define a Property that runs function and asserts something about result
let toDigitsEmpty x = (toDigits x) == []
-- run QuickCheck to validate property
quickCheck (forAll negInts toDigitsEmpty)
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