Re: How do I find the key of a specific hash element?

Dr.Ruud wrote:
> jshock schreef:
>> For example:
>>
>> my %weekdays = (
>> 0  => "SUN",
>> 1 => "MON",
>> 2 => "TUE",
>> 3 => "WED",
>> 4 => "THU",
>> 5 => "FRI",
>> 6 => "SAT",
>> );
>> $weekdays{2}; # gives "TUE"
>>
>> But what if I know "TUE" and want to find out what the key is? Is
>> there a construct like $weekdays{"TUE"} that gives 2"
> 
> The data structure that you show, belongs in an array. 
> 
> perl -le'
> #!/usr/bin/perl
>   use strict;
>   use warnings;
> 
>   my @n2d = qw( SUN MON TUE WED THU FRI SAT );
>   my %d2n; @d2n{ @n2d } = ( 0 .. $#n2d );
> 
>   print $d2n{ WED };
> '
> 3

It doesn't help to write UNIX shell commands when we are talking about a
cross-platform language. Please stop.

Rob