On 24 December 2010 23:58, Daniel Fischer
<[email protected]>wrote:
> On Saturday 25 December 2010 00:32:38, Aaron Gray wrote:
> > Okay great, works this end too, but what does the 'flip' do ???
>
> It flips the order of arguments to calc. You could also write
>
> main = getContents >>= print . (`calc` []) . lexer
>
> Generally,
>
> flip f = \x y -> f y x
>
> or
>
> flip f x = \y -> f y x
>
> flip f x y = f y x
>
Or :-
calcExpr :: [Token] -> Int
calcExpr tokens = calc tokens []
process = print . calcExpr . lexer
makes things clearer.
Aaron
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