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#!/usr/bin/perl
use v5.26;
use Test2::V0 -no_srand;
use Test2::Tools::Subtest 'subtest_streamed';
use Getopt::Long;
use experimental 'signatures';
use List::MoreUtils qw(all slideatatime);
### Options and Arguments
my ($tests, $examples, $verbose);
GetOptions(
'examples!' => \$examples,
'tests!' => \$tests,
'verbose!' => \$verbose,
) or usage();
run_tests($examples, $tests); # tests do not return
usage() unless @ARGV;
sub usage {
die <<~EOS;
$0 - ascending numbers
usage: $0 [-examples] [-tests] [STR]
-examples
run the examples from the challenge
-tests
run some tests
STR
a string or a list of words
EOS
}
### Input and Output
say +(qw(true false))[!ascending_numbers("@ARGV")];
### Implementation
#
# For details see:
# https://github.sommrey.de/the-bears-den/2025/10/17/ch-340.html#task-2
sub ascending_numbers ($str) {
my $it = slideatatime 1, 2, grep /^\d+$/, split /\s+/, $str;
while (my @pair = $it->()) {
return if @pair > 1 && $pair[1] <= $pair[0];
}
1;
}
### Examples and Tests
sub run_tests ($examples, $tests) {
return unless $examples || $tests;
state sub run_example ($args, $expected, $name) {
my $result = ascending_numbers(@$args);
is $result, $expected,
"$name: (@$args) -> " . $expected->name;
}
plan 2;
$examples ? subtest_streamed(examples => sub {
my @examples = (
[["The cat has 3 kittens 7 toys 10 beds"], T(), 'example 1'],
[["Alice bought 5 apples 2 oranges 9 bananas"], F(), 'example 2'],
[["I ran 1 mile 2 days 3 weeks 4 months"], T(), 'example 3'],
[["Bob has 10 cars 10 bikes"], F(), 'example 4'],
[["Zero is 0 one is 1 two is 2"], T(), 'example 5'],
);
plan scalar @examples;
for (@examples) {
run_example @$_;
}
}) : pass 'skip examples';
$tests ? subtest_streamed(tests => sub {
plan 1;
pass 'no tests';
}) : pass 'skip tests';
exit;
}
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