title: Search for an item in a Lua list
body: <p>If I have a list of items like this:</p>
  
  <pre><code>local items = { "apple", "orange", "pear", "banana" }
  </code></pre>
  
  <p>how do I check if "orange" is in this list?</p>
  
  <p>In Python I could do:</p>
  
  <pre><code>if "orange" in items:
      # do something
  </code></pre>
  
  <p>Is there an equivalent in Lua?</p>