my %hash = map { $_, 1 } @array;
What is the usage of 1 in this code?
When you have any kind of doubt about a Perl structure, you can use
Data::Dumper:
use Data::Dumper;
my %hash = map { $_, 1 } @array;
print Dumper \%hash;
Try it!
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Igor Sutton Lopes
t: +55 51 9627.0779
e: [EMAIL PROTE
L PROTECTED]
To: beginners@perl.org
Sent: Wed, 13 Sep 2006 9:38 PM
Subject: about map usage
Hi all,
In perlfaq4.pod I see one line:
my %hash = map { $_, 1 } @array;
What is the usage of 1 in this code?
Thanks,
Li
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What this does is creating a hash that looks like this:
%hash {
$array[0] => 1,
$array[1] => 1,
$array[2] => 1,
$array[3] => 1,
ect.
}
It is a (posibly the quickest way) of changing a array into a hash.
Hope it helps.
On 9/13/06, chen li <[EMAIL PROTECTED]>
Hi all,
In perlfaq4.pod I see one line:
my %hash = map { $_, 1 } @array;
What is the usage of 1 in this code?
Thanks,
Li
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