Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things

Re: "undef" is not NULL and what to do about it

by BrowserUk (Pope)
on Feb 21, 2013 at 16:30 UTC ( #1019977=note: print w/replies, xml ) Need Help??

in reply to "undef" is not NULL and what to do about it

I kind of see the problem you perceive, though I'd much prefer to handle it with defined:

foreach my $employee (@employees) { if ( defined $employee->salary and $employee->salary < $threshold +) { increase_salary( $employee, 3_000 ); } }

Double reference to $employee->salary or not; I bet it is a) more efficient than your module; b) far less prone to misunderstanding or accidental disablement than your scary-action-at-a distance module.

Personally; I think that instead of initialising things as unknown, you'd achieve a better effect by initialising them as #NaN>.

Indeed, I can see the case for a pragma to cause undef to be treated as #NaN in numeric contexts.

A lexically scoped use undefAsNaN; could be very useful I think.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1019977]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others exploiting the Monastery: (6)
As of 2016-10-23 01:42 GMT
Find Nodes?
    Voting Booth?
    How many different varieties (color, size, etc) of socks do you have in your sock drawer?

    Results (299 votes). Check out past polls.