Re: Better way to code an iterator function?

[Jerome Vuarand <jerome.vuarand@...>]

2009/10/23 Lawrence E. Bakst <ml@iridescent.org>:
> 1. Is there a better, shorter, cuter, or cooler way to code the example below?
>
> [...]
>
> function it_paths(paths)
>    local function next(state, var)
>        if (state.idx > #paths) then return nil end;
>        state.idx = state.idx + 1;
>        return paths[state.idx - 1];
>    end
>    local state = {idx = 1};
>    return next, state, "";
> end;
>
> function process_random_files(paths)
>    for path in it_paths(paths) do
>        print(path);
>    end
> end
>
> process_random_files{"foo", "bar", "baz", "quuz"};

I don't know if it's cuter or cooler, but with an upvalue to store the
state it's shorter :

function it_paths(paths)
	local index = 0
	return function()
		index = index + 1
		return paths[index]
	end
end