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+#!/usr/bin/env perl
+# vim:set ts=4 sw=4 sts=4 et ai wm=0 nu:
+#=============================================================================
+# ch-1.pl Perl Weekly Challenge Week 186 Task 1 Zip List
+#=============================================================================
+# Copyright (c) 2023, Bob Lied
+#=============================================================================
+# You are given two list @a and @b of same size.
+# Create a subroutine sub zip(@a, @b) that merge the two list as shown in
+# the example below.
+# Example Input:  @a = qw/1 2 3/; @b = qw/a b c/;
+#        Output: zip(@a, @b) should return qw/1 a 2 b 3 c/;
+#                zip(@b, @a) should return qw/a 1 b 2 c 3/;
+#=============================================================================
+
+use v5.36;
+
+use Getopt::Long;
+my $Verbose = 0;
+my $DoTest  = 0;
+
+GetOptions("test" => \$DoTest, "verbose" => \$Verbose);
+exit(!runTest()) if $DoTest;
+
+# Note that the spec of zip(@a, @b) can't be directly implemented with
+# signatures, because arrays flatten in the function call (you can't have
+# two @ parameters -- the first one slurps up all the arguments).  To pass
+# parameters that look like arrays, we have to provide a protoype
+# (see perldoc perlsub).  The prototype allows us to pass array names
+# with an @ sigil, but they are actually array references in the sub.
+sub zip :prototype(\@\@)
+{
+    # The outer map is a loop to set the index of an element.
+    # The inner map is an array dereference from each array at i.
+    # @_ is the list of arrays that were passed as parameters.
+    return map {  my $i = $_; map { $_->[$i] } @_ } } 0 .. $#{$_[0]};
+}
+
+my @a = qw/1 2 3/; my @b = qw/a b c/;
+
+zip(@a, @b);
+
+sub runTest
+{
+    use Test2::V0;
+
+    my @a = qw/1 2 3/;
+    my @b = qw/a b c/;
+    my @r = zip(@a, @b);
+    is( \@r, [1, 'a', 2, 'b', 3, 'c'], "Example 1");
+    @r = zip(@b, @a);
+    is( \@r, ['a', 1, 'b', 2, 'c', 3], "Example 2");
+
+    done_testing;
+}
+