iskm/learnxinyminutes-docs
1
0
Fork 0
mirror of https://github.com/adambard/learnxinyminutes-docs.git synced 2024-12-23 09:41:36 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Update haskell.html.markdown

Browse Source 
Minor improvements to polymorphic types
This commit is contained in:
ilyagr 2013-07-03 23:12:53 -07:00
parent 5477292824
commit 3c48fae101
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
haskell.html.markdown
View File

@ -292,9 +292,9 @@ say Green = "You are Green!"
data Maybe a = Nothing | Just a
-- These are all of type Maybe
Nothing
Just "hello"
Just 1
Just "hello" -- of type `Maybe String`
Just 1 -- of type `Maybe Int`
Nothing -- of type `Maybe a` for any `a`
----------------------------------------------------
-- 8. Haskell IO
@ -344,8 +344,8 @@ sayHello = do
-- Let's understand better how the function `getLine` we just
-- used works. Its type is:
-- getLine :: IO String
-- You can think of a value of type `IO String` as representing a
-- computer program that will generate a value of type `String`
-- You can think of a value of type `IO a` as representing a
-- computer program that will generate a value of type `a`
-- when executed (in addition to anything else it does). We can
-- store and reuse this value using `<-`. We can also
-- make our own action of type `IO String`: