Re: iterator sequences (was: Standard libraries)
[
Date Prev][
Date Next][
Thread Prev][
Thread Next]
[
Date Index]
[
Thread Index]
- Subject: Re: iterator sequences (was: Standard libraries)
- From: Mark Hamburg <mark@...>
- Date: Fri, 1 Jan 2010 13:21:43 -0800
On Jan 1, 2010, at 7:42 AM, Wim Couwenberg wrote:
> function seq(f, state, key)
> local function self(s, k, ...)
> if type(s) == "function" then
> f = s(self, f, k, ...) or f
> return self, state, key
> else
> return f(s, k)
> end
> end
> return self, state, key
> end
Could this be rewritten as:
function seq( f, state, key )
local function self( s, k, ... )
if s == state then
return f( s, k )
else
f = s( self, f, k, ... ) or f
return self, state, key
end
end
return self, state, key
end
The assumption here being that the state isn't going to be used as a modification operator for the sequence. Is that more or less of a potential problem than the assumption that the state won't be a function?
The explicit iterate change I proposed would also potentially apply but I left it out for clarity.
Mark