title: How can I filter an ArrayList in Kotlin so I only have elements which match my condition?
body: <p>I have an array:</p>
  
  <pre><code>var month: List&lt;String&gt; = arrayListOf("January", "February", "March")
  </code></pre>
  
  <p>I have to filter the list so I am left with only <code>"January"</code>.</p>