flip.js

function flip(f){
    return g; // flip' f = g

    function g(x, y){ // where g x y = f y x
        return f(y, x)
    }
}

function nyan(a, b) {
  console.log(a);
  console.log(b);
}

var flippedNyan = flip(nyan);
flippedNyan("nekogata", "chikuonki");