class Timer {

    has $!start-time = now;

    has @!event-log;

    method record ($event_description) {

        @!event-log.push({
            timestamp   => now - $!start-time,
            description => $event_description
        });

    }

    method report {

        my @report_lines;

        for @!event-log -> %event {

            @report_lines.push('[' ~ %event<timestamp>.fmt("%.3f") ~ '] ' ~ %event<description>);
        }

        return @report_lines.join("\n");
    }

}


my $timer = Timer.new;

my $counter_1 = 0;
for (1 .. 10000) {
    $counter_1++;
}

$timer.record("what");
$timer.record("wat");
my $counter = 0;
for (1 .. 10000) {
    $counter++;
}
$timer.record("not");
$timer.record("this");
$timer.record("that");

say $timer.report;