An alternative to your &find_first_index that I prefer (for smaller lists) is
use List::Util 'first';
sub find_first_index {
my $target = shift;
first { $_[$_] eq $target } 0 .. $#_;
}
# Simple enough to write inline:
my $idx = first { $ary[$_] eq $target } 0 .. $#ary;
I don't know about any efficiency issues though.
Update: Fixed a off-by-one bug in the sub and added parenthesis.
ihb
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