'...' is a variable,who can explain

Subject: '...' is a variable,who can explain
From: &quot;wj&quot; &lt;jiang_wang@ ... &gt;
Date: 2007年1月12日 13:24:24 +0800

look at this code:

--codes begin

function joinFunc(f1,f2)
return function (...)
return f1(f2(...)) --...treated as a variable! is it maze!
end

end

f1 = joinFunc(print,math.abs)

f1(-2) --out:2

--codes end

why the

Follow-Ups:
- Re: '...' is a variable,who can explain, jason zhang
- Re: '...' is a variable,who can explain, Aaron Brown