List of partial functions

Partial functions in Prelude

NB. Functions marked with (∞) are partial because the function will not terminate if given an infinite list.

Functions that aren't even partial

• error
• undefined

List functions

• maximum
• minimum
• head
• tail
• init
• last
• foldl (∞)
• foldl' (∞)
• foldl1
• foldl1'
• foldr1
• scanl1
• scanr1
• cycle
• !!
• length (∞)
• sum (∞)
• product (∞)
• reverse (∞)
• ... (todo)

Other

• read
• quot
• rem
• quotRem
• div
• mod
• divMod
• succ
• pred
• toEnum
• (^)
• fail
• ... (todo)

Partial functions in other base libraries

Data.List

• genericIndex
• genericLength (∞)

Data.Map

• (!)

Data.Maybe

• fromJust

Partial functions in other Haskell Platform packages

... (todo)