title: Flutter variable with const keyword
body: <p>In the 'Write Your First App' tutorial on the Flutter docs, Step 4 titled "Step 4: Create an infinite scrolling ListView", you are asked to create 2 variables show here:</p>
  
  <pre><code>class RandomWordsState extends State&lt;RandomWords&gt; {
    final _suggestions = &lt;WordPair&gt;[];
  
    final _biggerFont = const TextStyle(fontSize: 18.0);
    ...
  }
  </code></pre>
  
  <p>Why is the <code>const</code> keyword used in the 3rd line?  I come from a C# and JavaScript background and I'm not used to seeing this on the right side of an assignment statement.  I notice if I remove it it still works as I expected. Could you please explain <strong>in lamens terms</strong> why this is being used and when should I do the same?  I'm guessing it's overkill and I don't have to use it but I just want to make sure.  </p>
  
  <p>I do not believe this is a duplicate because the answer in this post was perfect in explaining my question and not found in the other post, not to mention the other post is a two part question that nobody would find when using google.</p>