Infix operator
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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.