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{key[x][i]!get[x]i:iasc key x:group(!). flip raze key[x],''get x} indexing into the keys instead of doing a lookup a smidge faster

/ our diadic function takes two arguments / x will be the table / y will be the elements in the list incrementally / converge form of over shows final result q)t{y _ x}/2 -3 4 x - 6 / using scan you can see the intermediate changes q)t{y _ x}\2 -3 4 ...

q)t:([]til 10) q)t{y x}/(5_;-2_) x - 5 6 7 / the intermediate steps q)t{y x}\(5_;-2_;2#) +(,`x)!,5 6 7 8 9 +(,`x)!,5 6 7 +(,`x)!,5 6