That’s a really good comparison! Lua has real types in a dynamic language; in Tcl everything is a string. They can both pass functions around, but Tcl’s work

That’s a really good comparison! Lua has real types in a dynamic language; in Tcl everything is a string. They can both pass functions around, but Tcl’s work by “eval” all the time—so security is quite tricky. Lua has real higher order functions. Lua has lexical scope. In fact, by semantics it’s almost a Scheme dialect (say, R4RS) with extraordinary syntax.