# Infix operator

From HaskellWiki

Revision as of 11:39, 18 July 2007 by Jimmy (talk | contribs) (talks about using infix operators as prefix functions, and vice versa)

## Overview

Functions in Haskell are usually called using prefix notation, or the function name followed by its arguments. However, some functions, like +, are called with infix notation, or putting the function name between its two arguments.

## Using infix functions with prefix notation

Putting parenthesis around an infix operator converts it into a prefix function:

Prelude> (+) 1 2 3 Prelude> (*) 3 4 12

## Using prefix functions with infix notation

Putting ` marks around a prefix function allows us to use it like an infix function:

Prelude> let concatPrint x y = putStrLn $ (++) x y Prelude> concatPrint "a" "b" ab Prelude> "a" `concatPrint` "b" ab

Note that you can only do this with a function that takes two arguments.