Re: Iterator question
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- Subject: Re: Iterator question
- From: Philipp Janda <siffiejoe@...>
- Date: 2013年6月12日 06:29:15 +0200
Am 12.06.2013 05:21 schröbte meino.cramer@gmx.de:
Hi,
Hi!
is it possible (and how) to create an iterator with lua, which returns
the [n]th _and_ the [n+1]th value of in array/table with each call?
Sure:
local function ip2_iter( st, var )
var = var+1
local v1 = st[ var ]
if v1 ~= nil then
return var, v1, st[ var+1 ]
end
end
local function ipairs2( t )
return ip2_iter, t, 0
end
for i,v,w in ipairs2( { "a", "b", "c", "d" } ) do
print( i, v, w )
end
1 a b
2 b c
3 c d
4 d nil
If you don't want the index, you need to create a closure to remember
the current index between iterator calls ...
Thank you very much in advance for any help!
Best regards,
mcc
HTH,
Philipp