#!/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";

[download]

Outputs: 

results: APPLE GRAPE PINEAPPLE

[download]

In reply to Re: How to Order an Array's Elements to Match Another Array's Element Order by tybalt89
in thread How to Order an Array's Elements to Match Another Array's Element Order by ozboomer

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