Re: select("#", ...) idiom
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- Subject: Re: select("#", ...) idiom
- From: Roberto Ierusalimschy <roberto@...>
- Date: 2005年9月14日 17:09:39 -0300
> Perhaps I missed this? What is its meaning?
... is an expression. #exp returns the length of the result of exp.
So, #... is the length of the first argument of a vararg function.
Try this:
function f (...) return #... end
print(f("hi", 4, 5))
Similarly, <<for i, v in ...>> also has a meaning. See next example:
function f (...) for i,v in ... do print(i,v) end end
f(pairs{2,4,5})
-- Roberto