#!/usr/bin/perl
use strict; # https://perlmonks.org/?node_id=11106277
use warnings;
my @array = ( "APPLE", "ORANGE", "PEACH", # Use this for the O
+RDER
"GRAPE", "BANANA", "PINEAPPLE" );
my @subset = ( "PINEAPPLE", "GRAPE", "APPLE" ); # A required subset
+but NOT
# in the required order
my %order;
@order{ @array } = 1 .. @array;
my @results = sort { $order{$a} <=> $order{$b} } @subset;
print "results: @results\n";
Outputs:
results: APPLE GRAPE PINEAPPLE
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