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- Subject: Re: looking for a better idiom
- From: "J.Jørgen von Bargen" <jjvb.primus@...>
- Date: Sat, 24 Apr 2010 17:33:54 +0200
On 4/24/10 7:53 AM, "J.Jørgen von Bargen" wrote:
I'm looking for a better idiom for
local data=lookup[item] or {}
lookup[item]=data
Am 24.04.2010 17:00, schrieb Peter Cawley:
The obvious approach is to effectively make your ta function the
__index metamethod for the lookup table:
Am 24.04.2010 17:07, schrieb Daniel Stephens:
but I'm curious, is there a reason why you didn't consider:
local data = lookup[item]
if (data == nil) then data = {} lookup[item] = data; end
Thanks for your replies, here's my benchmark for your submissions
-----------------------------------
-- MAX = 4.238 ms
-- use_setmetatable : 3.407 ms = 293 loops/s [ 80.40 %] 1.244
times faster
-- function_ta : 3.631 ms = 275 loops/s [ 85.68 %] 1.167
times faster
-- use_if_nil : 3.644 ms = 274 loops/s [ 85.99 %] 1.163
times faster
-- uggly_code : 4.238 ms = 235 loops/s [100.00 %] 1.000
times faster
-----------------------------------
setmetatable takes the lead, but the competition is still open... :-)
Regards Jørgen
