Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical
 
PerlMonks  

Re: $1, etc. are not just strings

by ikegami (Pope)
on Jan 04, 2007 at 16:49 UTC ( #592985=note: print w/ replies, xml ) Need Help??


in reply to $1, etc. are not just strings

That reminds me of the danger of passing a var to a function that modifies that var. It's particularly easy to screw up when dealing with built-in globals variables such as $1.

sub func { 'b' =~ /(.)/; print(@_, "\n"); } 'a' =~ /(.)/; func($1); # Prints "b" 'a' =~ /(.)/; func("$1"); # Prints "a"
sub func { eval { die "bar\n" }; print(@_); } eval { die "foo\n" }; func($@); # Prints "bar" eval { die "foo\n" }; func("$@"); # Prints "foo"

(If you want to mess with your mind, try removing the second 'a' =~ /(.)/; from the first snippet.)


Comment on Re: $1, etc. are not just strings
Select or Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://592985]
help
Chatterbox?
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: (12)
As of 2014-12-25 16:47 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    Is guessing a good strategy for surviving in the IT business?





    Results (160 votes), past polls