Index of current array

[zzzqqq]

Hi,
Anyone know is it possible to get the current index of an array in perl?
Eg. $index = @array($index);
Say current index is 3.
Cheers,
Mark.

 

[TrojanWarBlade]

I don't understand your question and I'm not sure you do either!
Your syntax is incorrect for accessing an element via an index.
If you can try to explain in a little more detail what exactly you are trying to do I'm sure we can help.



Trojan.

 

[zzzqqq]

Cheers,
Just trying to find the index number of an element in an array. say $array[3] = "29".
Hoping there's a way of finding the index number, i.e. say the 3 number in this case.
Mark.

 

[dmazzini]

I guess you are looking d=for the position...

e.g

@list=("Monday","Tuesday","Wednesday","Thursday","Friday");
$look_for="Wednesday";

for ($i=0; $i<$#list; $i++) {
if ($list[$i] eq $look_for) { last; }
}

print "The word $look_for is item number $i in the list";


dmazzini
GSM System and Telecomm Consultant

 

[TrojanWarBlade]

Then you need to search the array in sequence.
Or you need to create a hash of values to use for lookup.

Try this:

my $index =  undef;
for(my $i=0; $i<=$#array; $i++) {
  $index = $i if($array[$i] == 3);
}
print $index,"\n" if(defined $index);

Trojan.

 

[kordaff]

my @array=qw/1 2 3 4 5 6 7 8 9 10/;
print "\@array starts at \$array[0] and ends at \$array[";
print $#array , "]\n";

 

[KevinADC]

Just trying to find the index number of an element in an array. say $array[3] = "29".

well, if you know $array[3] = 29 you already have the index number, which is 3, the 4th element of the array.

 

[kordaff]

Yeah. Perl arrays are 0-indexed and $#arrayname is the index to the last element of the array, one less than the total number of elements in the array.

pop(@array) returns the last element of @array (and removes it from the array decreasing its length)
shift(@array) returns the first (0-indexed) element of @array (removing it from the @array and decreasing $#array by one)

Both pop and shift can return undefined if the array is empty. Both default to @ARGV or @_ if not given an array depending on what scope your program happens to be in at that point. =)