> is an arrow that takes a pair of values and combines them to return a single value:</p
><preclass="sourceCode haskell"
><code
>unsplit :: (Arrow a) => (b -> c -> d) -> a (b, c) d
unsplit = arr . uncurry
-- arr (\op (x,y) -> x `op` y)
</code
></pre
><p
><code
>(***)</code
> combines two arrows into a new arrow by running the two arrows on a pair of values (one arrow on the first item of the pair and one arrow on the second item of the pair).</p