Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked
 
PerlMonks  

Re: understanding symbols

by dreadpiratepeter (Priest)
on Aug 03, 2011 at 19:24 UTC ( #918364=note: print w/ replies, xml ) Need Help??


in reply to understanding symbols

the first is a special variable. In this case the OUTPUT_AUTOFLUSH variable that controls whether the output is buffered. You can read about it an other variables by typing perldoc perlvar

In the second case you have a hash that contains references to arrays. something like

%h = (a => [1,2], b => [3,4]);
. the  $h0{puts} part returns a <b>reference</b> to an array. To dereference it you need to put a '@' in front of it.  so to dereference $a, you would type <code>@$a. you a more complex expression that yields a reference you would use @{} to dereference it for clarity.

Similarly, in the third example you are dereferencing a reference to a hash $hr1 to get a hash. The third could by written more succinctly as %$hr1

Typing perldoc perlreftut will teach you about references and dereferencing.

It also sounds like you could use a good introduction to Perl. I would suggest Learning Perl or Modern Perl.



-pete
"Worry is like a rocking chair. It gives you something to do, but it doesn't get you anywhere."


Comment on Re: understanding symbols
Select or Download Code
Re^2: understanding symbols
by baperl (Sexton) on Aug 03, 2011 at 19:39 UTC
    thanks Pete, that clarifies. I will look up the perl docs and books you suggested :-)

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://918364]
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: (9)
As of 2015-07-07 06:40 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