Re^2: Check/set hash of hashes value

Thanks Dave, so let me get this right - here, the value I was attempting to check if it was undef, I was effectively setting the value to undef !

Comment on Re^2: Check/set hash of hashes value

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Re^3: Check/set hash of hashes value by davido (Cardinal) on Jun 24, 2013 at 17:43 UTC
Just as you wouldn't use "`=`" to test equality (you would use "`==`"), you wouldn't use "`undef`" to test definedness, you would use "`defined`". undef will undefine its operand. defined will test its operand. Dave	[reply] [d/l] [select]
Re^3: Check/set hash of hashes value by kennethk (Abbot) on Jun 24, 2013 at 17:31 UTC
Exactly. See undef, which is a wildly different function than defined. #11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.	[reply]