.......To my knowledge, the F-35B has yet to take off using a ski-jump although one exists at NAS Lakehurst for trials purposes
Draken, not so sure about if there is/was a ramp at Lakehurst, but there has been a ski jump at Patuxent River Naval Air Station, or as most call it "Pax River". Lakehurst does do most of the initial catapult and arrestment testing for US (and French) Navy aircraft. Pax River does the majority of US Navy test and evalation, envelope expansion, weapons release trials, etc and has been heavily involved in F-35 Work. They first got a ramp there in the 1980's? and tested many aircraft on the ramp- even the F-14.
Pax River recently got a newer ramp for the "B". I have seen it. Agree that I have not heard of a F-35 using a ramp yet.
2014 Article on the newer ramp at Pax River.
Pax ski jump readied for future F-35B Lightning II launches -- DCMilitary.com