Traditionally in Scheme all data structures are mutable (the PLT folks made the gutsy move of making conses immutable only recently and they're basically the on

Traditionally in Scheme all data structures are mutable (the PLT folks made the gutsy move of making conses immutable only recently and they're basically the only ones doing that, I think), so no difference there. But both Lua and JavaScript are organized around hashtables rather than lists; maybe that's the biggest difference data structure-wise.