Re: 4 function calculator in Lua

[Luiz Henrique de Figueiredo <lhf@...>]

> but you do  not normally write a 4 function calculator because you
> need one, you do it as an exercise in learning the language, as it
> touches several areas and is easy to test.

There is also a learning opportunity in the other direction: using
metatables to generate code or parse trees.
See these messages:
http://lua-users.org/lists/lua-l/2017-02/msg00139.html
http://lua-users.org/lists/lua-l/2011-03/msg01059.html