title: React - useMemo without dependencies array vs empty array
body: <p>What is the difference between doing</p>
  <pre><code>const value = useMemo(() =&gt; {
       ...
  });
  </code></pre>
  <p>and</p>
  <pre><code>const value = useMemo(() =&gt; {
       ...
  }, []);
  </code></pre>
  <p>?</p>