Section of an infix operator
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In Haskell there is a special syntax for partial application on infix operators.
(2^)is equivalent to(^) 2(^2)is equivalent toflip (^) 2
Like partial application and lambda abstraction, sectioning provides a convenient way of writing some functions without having to explicitly name them:
(1+)(unsugared:(+) 1) is the "increment" function,(2*)is the "double" function,('\t':)is the "indent" function,(`elem` "AEIOU")is the "is-capital-vowel-in-English" function (ignoring the "sometimes Y").