Re: About the #(length) operator and table.getn
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- Subject: Re: About the #(length) operator and table.getn
- From: "Patrick Donnelly" <batrick.donnelly@...>
- Date: 2008年3月25日 16:35:52 -0600
On Tue, Mar 25, 2008 at 3:08 PM, RJP Computing <rjpcomputing@gmail.com> wrote:
> On Tue, Mar 25, 2008 at 2:45 PM, Petite Abeille <petite.abeille@gmail.com>
> wrote:
> > Don't let that stop you! Write your own!
> >
> > local function ForEach( aTable, aFunction )
> > for aKey, aValue in pairs( aTable ) do
> > aFunction( aKey, aValue )
> > end
> > end
> >
> > ForEach( { a = 1, b = 2, c = 3 }, print )
> >
> > > a 1
> > > c 3
> > > b 2
> >
> > Or something!
> >
>
> Very cool. Great idea. Of coarse. Thanks for such a simple solution.
> --
> Regards,
> Ryan
That's not quite how foreach works (but it's good enough for most
people). Here's how foreach works in Lua currently:
table.foreach(t, f)
for k,v in pairs(t) do
local brk = f(k, v)
if brk ~= nil then
return brk;
end
end
end
foreachi works similarly but with ipairs instead.
--
-Patrick Donnelly
"One of the lessons of history is that nothing is often a good thing
to do and always a clever thing to say."
-Will Durant