title: Best way to iterate over multiple arrays?
body: <p>What's is the best (beauty and efficient in terms of performance) way to iterate over multiple arrays in Ruby?
  Let's say we have an arrays:</p>
  
  <pre><code>a=[x,y,z]
  b=['a','b','c']
  </code></pre>
  
  <p>and I want this:</p>
  
  <pre><code>x a
  y b
  z c
  </code></pre>
  
  <p>Thanks.</p>