title: Check if two unordered lists are equal
body: <p>I'm looking for an easy (and quick) way to determine if two <strong>unordered</strong> lists contain the same elements:</p>
  
  <p>For example:</p>
  
  <pre><code>['one', 'two', 'three'] == ['one', 'two', 'three'] :  true
  ['one', 'two', 'three'] == ['one', 'three', 'two'] :  true
  ['one', 'two', 'three'] == ['one', 'two', 'three', 'three'] :  false
  ['one', 'two', 'three'] == ['one', 'two', 'three', 'four'] :  false
  ['one', 'two', 'three'] == ['one', 'two', 'four'] :  false
  ['one', 'two', 'three'] == ['one'] :  false
  </code></pre>
  
  <p>I'm hoping to do this without using a map.</p>