# Infix operator

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(talks about using infix operators as prefix functions, and vice versa) |
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## Revision as of 17:43, 22 July 2007

## 1 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.

## 2 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

## 3 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.