Find Index value of a specific element in an array

l.frankline has asked for the wisdom of the Perl Monks concerning the following question:

Dear Monks,

I am trying to find out the index value of a specific element in an array. I have tried below code and it is working fine,
but it doesn't seems to be pretty well, because the code contains too many lines.

Is there any shortest and easiest way.

@roman = qw(i ii iii iv v vi vii viii ix x xi xii xiii xiv xv xvi xvii
+ xviii xix xx);
$indx=0;
for (@roman) {
     $indx++;
     print "Index value for $_ is: $indx" if ($_ eq 'xiv');
}
[download]

Results:

Index value for xiv is: 14

Thanks in advance
Regards,
Franklin.

Don't put off till tomorrow, what you can do today.

Comment on Find Index value of a specific element in an array Select or Download Code

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Re: Find Index value of a specific element in an array by bobf (Monsignor) on Jan 03, 2006 at 06:16 UTC
Take a look at Limbic~Region's excellent Tutorial entitled Getting Matching Items From An Array, in which he discusses several solutions including the grep method described above and one that uses List::Util's `first` function. Also, don't forget about Super Search and the Categorized Questions and Answers section, which has a large collection of posts in the QandASection: arrays category, including How do I find the position of an element in an array? and How can I find the index of the biggest element in an array?.	[reply] [d/l]
Re: Find Index value of a specific element in an array by Samy_rio (Vicar) on Jan 03, 2006 at 06:01 UTC
the code contains too many lines Hi, here is an alternate way to do this, but as far as efficency i am not sure. `my ($index) = grep $roman[$_] eq "xiv", 0..$#roman;` [download] Also take a look at this finding index number in an array Regards, Velusamy R. eval"print uc\"\\c$_\""for split'','j)@,/6%@0%2,`e@3!-9v2)/@\|6%,53!-9@2~j';	[reply] [d/l] [select]
Re: Find Index value of a specific element in an array by grinder (Bishop) on Jan 03, 2006 at 10:49 UTC
Is there any shortest and easiest way. In this specific domain, yes there is: `use Math::Roman; print Math::Roman->new(uc $_)->as_number, "\n" for @roman;` [download] That's maybe not quite what you had in mind, but I throw it in for completeness. • another intruder with the mooring in the heart of the Perl	[reply] [d/l]
Re: Find Index value of a specific element in an array by holli (Abbot) on Jan 03, 2006 at 10:43 UTC
I don't know if that roman number example is just academic (in that case the following won't help much), but `use Roman; print "value for XIV is ", arabic("xiv");` [download] There a number of modules that deal with roman numbers on CPAN. holli, /regexed monk/	[reply] [d/l]


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