Make seven, times and five functions where seven(times(five())) == 35.

gistfile1.js

function makeNum(n, f) {
  if (f == null) { return n; }
  else { return f(n); }
}
function five(f) {
  return makeNum(5, f);
}
function seven(f) {
  return makeNum(7, f);
}

function times(v) {
  return function(u) { return v * u; };
}