jcalz's comment worked till it didn't because i figured that .reduce() passes all the arguments to the function in one go, without giving the curried function a chance to process each argument individually, as currying expects. I knew, I had to do it with loop but i was stuck until this answer by Alexander Nenashev came to clutch, with little work from me also, this is the result that WORKS! KUDOS TO BOTH GENTLEMANS for helping me to finish this brainf*ck.