CurryInfo: base-3.4.0 / Data.Function.on
definition: 
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on :: (b -> b -> c) -> (a -> b) -> a -> a -> c on op f x y = f x `op` f y |
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demand:
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argument 1 |
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deterministic:
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deterministic operation |
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documentation:
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`on f g x y` applies the binary operation `f` to the results of
applying operation `g` to two arguments `x` and `y`.
Thus, it transforms two inputs and combines the outputs.
(*) `on` f = \x y -> f x * f y
A typical usage of this operation is:
sortBy ((<=) `on` fst)
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failfree:
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(_, _, _, _) |
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indeterministic:
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referentially transparent operation |
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infix:
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no fixity defined |
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iotype:
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{(_,_,_,_) |-> _}
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name:
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on |
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precedence:
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no precedence defined |
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result-values:
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_ |
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signature:
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(a -> a -> b) -> (c -> a) -> c -> c -> b |
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solution-complete:
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operation might suspend on free variables |
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terminating:
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yes |
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totally-defined:
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reducible on all ground data terms |