Matt, M.S.

I just translated an old PHP function to its Ruby counterpart. I think it really showcases Ruby's elegance:

PHP Version:

function calc_pct_complete($job_id, $d) {
  $pc = 0;
  $sql = "some SQL query";
  $res = mysql_query($sql);
  while ($row = mysql_fetch_array($res)) {
    $x = total_days($row[start_date], $d) / total_days($row[start_date], $row[end_date]);
    if ($x < 0) {
      $x = 0;
    } elseif ($x > 1) {
      $x = 1;
    } elseif ($row[name] != "X" && $row[name] != "Y") {
      $x = $x * $x;
    }
    $pc += $x * $row[pct_hours];
  }
  mysql_free_result($res);
  return $pc;
}

Ruby Version:

def percentage_complete(date = Date.today)
  self.phases.inject(0.0) do |sum, phase|
    percent_complete = phase.percentage_complete(date)
    percent_complete = percent_complete ** 2 unless %w{X Y}.include?(phase.name)

    sum += (percent_complete * phase.percentage_of_hours)
  end
end