title: Dart convert every element of list
body: <p>I have a <code>List&lt;String&gt; stringValues;</code> that are actually numbers in quotes. I want to convert this list to <code>List&lt;int&gt; intValues</code>. What's an elegant way to do this?</p>
  
  <p>There is <code>list.forEach()</code> that does not return anything, there is <code>iterable.expand()</code> that returns an iterable per element, there is <code>iterable.fold()</code> that returns just one element for the whole list. I could not find something that will allow me to pass each element through a closure and return another list that has the return values of the closure. </p>