luaL_checkstring[-0, +0, v] const char *luaL_checkstring (lua_State *L, int arg); Checks whether

lua_isnoneornil[-0, +0, –] int lua_isnoneornil (lua_State *L, int index); Returns 1 if the given index

lua_xmove[-?, +?, –] void lua_xmove (lua_State *from, lua_State *to, int n); Exchange values between different

3.4.6 – Concatenation The string concatenation operator in Lua is denoted by two dots ('..'). If both operands are strings or numbers, then they are converted to strings according

lua_setupvalue[-(0|1), +0, –] const char *lua_setupvalue (lua_State *L, int funcindex, int n); Sets the

lua_isfunction[-0, +0, –] int lua_isfunction (lua_State *L, int index); Returns 1 if the value at the given

os.remove (filename) Deletes the file (or empty directory, on POSIX systems) with the given name. If this function fails, it returns nil, plus a string describing the error

tostring (v)string.format If the metatable of v

luaL_requiref[-0, +1, e] void luaL_requiref (lua_State *L, const char *modname, lua_CFunction

debug.setlocal ([thread,] level, local, value) This function assigns the value value to the local variable with index local of the function at level