Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?
 
PerlMonks  

Re: Is it evaluated in scalar or list context?

by 7stud (Deacon)
on Jan 19, 2013 at 19:53 UTC ( #1014231=note: print w/ replies, xml ) Need Help??


in reply to Is it evaluated in scalar or list context?

$var1 = something1 ;

On the left of the assignment is a scalar variable. A scalar variable on the left of an assignment cries out, "Give me a scalar(single) value to store!" Similarly, an array variable on the left of an assignment:

@x = something;

...cries out, "Give me a list to store!"

Now look at this code:

use strict; use warnings; use 5.012; my @something = ('a', 'b', 'c'); my $x = @something; my($y) = @something; say $x; say $y; --output:-- 3 a

When $x cries out for a single value, the array provides its length. On the other hand, ($y) is a list, and it cries out for a list--so that list assignment can be performed:

my @something = ('a', 'b', 'c'); my $d; my $e; my $f; ($d, $e, $f) = @something; say $d; say $e; say $f; --output:-- a b c
($d, $e) = @something; say $d; say $e; --output:-- a b
($d) = @something; say $d; --output:-- a
$d = @something; say $d; --output:-- 3
my($s, $t, $u) = @something; say $s; say $t; say $u; --output:-- a b c


Comment on Re: Is it evaluated in scalar or list context?
Select or Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1014231]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others lurking in the Monastery: (7)
As of 2015-07-04 13:10 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 (60 votes), past polls