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Full Discussion: Perl Hash if exists
Top Forums Shell Programming and Scripting Perl Hash if exists Post 302282714 by KevinADC on Sunday 1st of February 2009 04:16:49 PM
Old 02-01-2009
See if key is in a hash:

Code:
my $input = 'one';
chomp $input;
print exists $hash{$input} ? $hash{$input} : "$input is not a hash key";

Find a hash key given a value:

Code:
my $input = '1';
chomp $input;
foreach my $key (keys %hash) {
   if ($hash{$key} eq $input) {
      print "The key for $input is $key\n";
   }
}

 

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LEARN ABOUT DEBIAN

moosex::attributehelpers::methodprovider::hash

MooseX::AttributeHelpers::MethodProvider::Hash(3pm)	User Contributed Perl Documentation    MooseX::AttributeHelpers::MethodProvider::Hash(3pm)

NAME

       MooseX::AttributeHelpers::MethodProvider::Hash - method generator for MooseX::AttributeHelpers::Collection::Hash

DESCRIPTION

       This is a role which provides the method generators for MooseX::AttributeHelpers::Collection::Hash.

       This role is composed from the MooseX::AttributeHelpers::Collection::ImmutableHash role.

METHODS

       meta

PROVIDED METHODS

       count
	   Returns the number of elements in the hash.

       delete
	   Removes the element with the given key

       defined
	   Returns true if the value of a given key is defined

       empty
	   If the list is populated, returns true. Otherwise, returns false.

       clear
	   Unsets the hash entirely.

       exists
	   Returns true if the given key is present in the hash

       get Returns an element of the hash by its key.

       keys
	   Returns the list of keys in the hash.

       set Sets the element in the hash at the given key to the given value.

       values
	   Returns the list of values in the hash.

       kv  Returns the	key, value pairs in the hash

       accessor
	   If passed one argument, returns the value of the requested key. If passed two arguments, sets the value of the requested key.

BUGS

       All complex software has bugs lurking in it, and this module is no exception. If you find a bug please either email me, or add the bug to
       cpan-RT.

AUTHOR

       Stevan Little <stevan@iinteractive.com>

COPYRIGHT AND LICENSE

       Copyright 2007-2009 by Infinity Interactive, Inc.

       <http://www.iinteractive.com>

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.10.1							    2010-01-02		       MooseX::AttributeHelpers::MethodProvider::Hash(3pm)
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