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#!/usr/bin/perl -s
use v5.24;
use Test2::V0;
use experimental 'signatures';
our ($tests, $examples);
run_tests() if $tests || $examples; # does not return
die <<EOS unless @ARGV == 2;
usage: $0 [-examples] [-tests] [S T]
-examples
run the examples from the challenge
-tests
run some tests
S T
two strings
EOS
### Input and Output
say merge_strings(@ARGV);
### Implementation
sub merge_strings ($s, $t) {
my $zip;
while ($s || $t) {
$zip .= ($s && substr($s, 0, 1, '')) . ($t && substr($t, 0, 1, ''));
}
$zip;
}
### Examples and tests
sub run_tests {
SKIP: {
skip "examples" unless $examples;
is merge_strings('abcd', '1234'), 'a1b2c3d4', 'example 1';
is merge_strings('abc', '12345'), 'a1b2c345', 'example 2';
is merge_strings('abcde', '123'), 'a1b2c3de', 'example 3';
}
SKIP: {
skip "tests" unless $tests;
}
done_testing;
exit;
}
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