in reply to grep { } positional number of element

Or, if you dislike loops: 

use v5.16;
use List::MoreUtils 'reduce_u';
my @array = qw(alpha beta gamma);
reduce_u {say "at position $_ there is $b"} @array;

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Greetings,
-jo

$gryYup$d0ylprbpriprrYpkJl2xyl~rzg??P~5lp2hyl0p$

In Section Seekers of Perl Wisdom