Re: Conventional name proposal: merge
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- Subject: Re: Conventional name proposal: merge
- From: David Favro <lua@...>
- Date: 2012年12月14日 10:37:02 -0500
On 12/14/2012 06:30 AM, Dirk Laurie wrote:
local function merge(...)
local s, arg = {}, {...}
local n = select('#',...)
for j=1,n do if type(arg[j])=='table' then
for k,v in pairs(arg[j]) do s[k]=v end
end end
return s
end
Slightly off-topic, but... my testing indicates that replacing:
local n = select('#',...)
with:
local n = #arg
generates smaller code that looks to be more efficient, using both 5.1 & 5.2
luac. Are they not equivalent?
My test code:
-- luac -l -o /dev/null test-vararg.lua
function va1(...)
local arg = {...};
return arg, select('#',...);
end
function va2(...)
local arg = {...};
return arg, #arg;
end