title: Julia: Check if elements from one vector are within another vector
body: <p>I would like to check if the elements in one vector are contained within another vector. In R there is the operator <code>%in%</code>.</p>
  
  <p>For example the operator would do the following:</p>
  
  <pre><code> [1,3,5,7,9,4] %in% [1,2,4,5,8,9,10,11] 
   # [true,false,true,false,true,true]
  </code></pre>
  
  <p>I can easily write my own only I am trying not to reinvent the wheel.</p>