Partial functions

From HaskellWiki

A partial function is a function that is not defined for all possible arguments of the specified type. Examples in the Haskell standard library are:

• head
  ,
  tail
  : undefined for empty lists
• (!!)
  : undefined if the index is at least as big as the list length
• div
  : undefined if the divisor is zero

The opposite is a total function.

There are methods to avoid the use of partial functions.

Category: Glossary