Beefy Boxes and Bandwidth Generously Provided by pair Networks
Problems? Is your data what you think it is?

Re^2: ARGV question

by olus (Curate)
on Aug 18, 2008 at 22:13 UTC ( #705085=note: print w/replies, xml ) Need Help??

in reply to Re: ARGV question
in thread ARGV question

I got curious about that behavior of the zero length result, went looking and now humbly share my findings.

In chapter 3 of Programming Perl it is said that

The equal and not-equal operators return 1 for true and "" for false (3.12)


The && and || operators differ from C's in that, rather than returning 0 or 1, they return the last value evaluated. (3.14)

so, @ARGV is greater than 0 and passes, eq fails and returns '', and thus && returns the last value evaluated, which is ''.

Log In?

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://705085]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (3)
As of 2022-09-30 21:35 GMT
Find Nodes?
    Voting Booth?
    I prefer my indexes to start at:

    Results (126 votes). Check out past polls.