Personal tools

Infix operator

From HaskellWiki

(Difference between revisions)
Jump to: navigation, search
m (Infix operators moved to Infix operator)
m (Categorize, link to "section of an infix operator")
Line 1: Line 1:
  +
[[Category:Syntax]] [[Category:Glossary]]
 
== Overview ==
 
== Overview ==
   
Line 23: Line 24:
   
 
Note that you can only do this with a function that takes two arguments.
 
Note that you can only do this with a function that takes two arguments.
  +
  +
==Section==
  +
See the article [[section of an infix operator]]

Revision as of 17:46, 22 July 2007

Contents

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.

4 Section

See the article section of an infix operator