From the docs I understand that it is interpreted and runs on erlang vm. I did not find anywhere that lfe code is compiled.
[1] https://github.com/rvirding/lfe/blob/develop/doc/lfe_comp.tx...
Having said that, they all support interactivity via a shell, including dynamically defining functions and tweaking the runtime. LFE does a better job at functions than Erlang; I'd wager Elixir too, but haven't looked closely at it.