title: List comprehension in Ruby
body: <p>To do the equivalent of Python list comprehensions, I'm doing the following:</p>
  
  <pre><code>some_array.select{|x| x % 2 == 0 }.collect{|x| x * 3}
  </code></pre>
  
  <p>Is there a better way to do this...perhaps with one method call?</p>