Re: Syntactic sugar for sets

[Rici Lake <lua@...>]

Luiz Henrique de Figueiredo wrote:
> > example = {["foo"], ["bar"], ["baz"]}
> >
> > as an abbreviation for
> >
> > example = {["foo"] = true, ["bar"] = true, ["baz"] = true}
>
> This hadn't come up until now, but a common idiom is to let Lua do the work:
>
> function makeset(t)
> 	local s={}
> 	for i,v in ipairs(t) do
> 		s[v]=true
> 	end
> 	return s
> end
>
> example = makeset{"foo", "bar", "baz"}


I very fond of the following idiom:

function wordsToSet(str, rv)
  rv = rv or {}
  for k in str:gmatch"%S+" do rv[k] = k end
  return rv
end

example = wordsToSet[[foo bar baz]]