AdditionalResources.md

Additional Resources for curious readers

Infix operators

Resource: haskell infix documentation

There are three kinds of fixity, non-, left- and right-associativity (infix, infixl, and infixr, respectively), and ten precedence levels, 0 to 9 inclusive (level 0 binds least tightly, and level 9 binds most tightly). If the digit is omitted, level 9 is assumed. Any operator lacking a fixity declaration is assumed to be infixl 9.

Precedence	Left associative	Non associative	Right associative
9	!!	-	.
8	-	-	^, ^^, **
7	*, /, `div`, `mod`, `rem`, `quot`	-	-
6	+, -	-	-
5	-	-	:, ++
4	-	==, /=,<, <=, >, >=, `elem`, `notElem`	-
3	-	-	&&
2	-	-	`
1	>>, >>=	-	-
0	-	-	$, $!, `seq`

Imports

Resource: haskell import documentation

Supposing that the module Mod exports three functions x, y, z.

Import command	What is brought into scope
import Mod	x, y, z, Mod.x, Mod.y, Mod.z
import Mod ()
import Mod (x, y)	x, y,Mod.x, Mod.y
import qualified Mod	Mod.x, Mod.y, Mod.z
import qualified Mod (x, y)	Mod.x, Mod.y
import Mod hiding (x, y)	z, Mod.z
import qualified Mod hiding (x, y)	Mod.z
import Mod as Foo	x, y, z, Foo.x, Foo.y, Foo.z
import Mod as Foo (x, y)	x, y,Foo.x, Foo.y
import qualified Mod as Foo	Foo.x, Foo.y, Foo.z
import qualified Mod as Foo (x, y)	Foo.x, Foo.y