-
It’s creating a unary projection / composition for the part in brackets, could achieve the same with a lamda function:
q)(`time`sym~2#key flip value@) ~[`time`sym]#[2]!+@[.:]
q)(`time`sym~2#key flip value@) each t 110b q){`time`sym~2#key flip value x} each t 110b
* there is an overhead with using lambdas so in tick it’s preferred to be as efficient as possible