title: Convert string of whitespace separated numbers in a string into integers and place them in variables
body: <p>I'm trying to write a function(s) to accept a string of 4 whitespace separated numbers in a string, separate and convert them to integers, and place them in 4 individual integer variables.  I know I can use <code>splitWs</code> to split them into a string array, use <code>!!</code> to access the individual elements, and something like the following to convert to integer:</p>
  
  <pre><code>f :: [String] -&gt; [Int]
  f = map read
  </code></pre>
  
  <p>But I can't figure out how to put it all together.</p>