Beefy Boxes and Bandwidth Generously Provided by pair Networks
Don't ask to ask, just ask
 
PerlMonks  

Re^3: defining variables using my - subroutines

by kennethk (Abbot)
on Sep 05, 2012 at 17:34 UTC ( #991898=note: print w/ replies, xml ) Need Help??


in reply to Re^2: defining variables using my - subroutines
in thread defining variables using my - subroutines

Under normal usage, they take values not variables. If you run the code

sub add_one { my $x = shift; $x += 1; return $x; }
You would not expect the variable you passed in (my $y = add_one($outer_x);) to change value, right? This is a little awkward/contrived, but this is in contrast to more object-oriented frameworks.

Advanced: Of course Perl actually does pass by reference with lvalues bound to @_. But that's probably the best reason for transferring subroutine inputs to locally-scoped variables.


#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.


Comment on Re^3: defining variables using my - subroutines
Select or Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://991898]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others contemplating the Monastery: (6)
As of 2015-07-07 07:09 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (87 votes), past polls