Why does this work?

[Steve Litt <slitt@...>]

Hi all,

Why does this work?

#!/usr/bin/lua

do
	local oldprint = print
	print = function(str)
		oldprint("======================================")
		oldprint(str)
		oldprint("======================================")
	end
end

print("Hello World")
os.exit(0)

I understand everything except the magical working of argument str. How does 
the oldprint(str) between the lines of equal know that the str arg in the 
function declaration refers to the argument of the original print()? Looks 
like magic to me, and I'm going to have to explain it.

Thanks

SteveT




-- 
Steve Litt
Recession Relief Package
http://www.recession-relief.US
Twitter: http://www.twitter.com/stevelitt