Modules
A module is a compilation unit which exports types, functions, type classes and other modules.
Module Declaration and Export
The name of a module must start with a capital letter.
-- Declare a module and export all the types and functions
module MyMod where
-- Declare a module and export some types or functions
module MyMod (Maybe(..), add) where
data Maybe a = Just a | Nothing
add :: Integer -> Integer -> Integer
add x y = x + y
Main
-- Main
module Main where
import Prelude
main = println "Hello World"
Import
import Data.List
import Data.Map (keys, values)
nth 1 [1..10] -- 1
keys #{"key" => "val"} -- ["key"]
values #{"key" => "val"} -- ["val"]
-- Qualified Imports
import Data.Set as Set
import Data.Map as Map
Map.get "foo" #{"foo" => "bar"}
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