title: React.Component doesn’t implement shouldComponentUpdate?
body: <p>According to the docs, React.Component doesn't implement <code>shouldComponentUpdate</code> ?</p>
  
  <p>So how about a lifecycle of a component (<a href="https://reactjs.org/docs/react-component.html#the-component-lifecycle" rel="nofollow noreferrer">the-component-lifecycle</a>) (<a href="https://reactjs.org/docs/react-component.html#shouldcomponentupdate" rel="nofollow noreferrer">shouldcomponentupdate</a>) ?</p>
  
  <blockquote>
    <p>React.PureComponent is similar to React.Component. The difference
    between them is that React.Component doesn’t implement
    shouldComponentUpdate(), but React.PureComponent implements it with a
    shallow prop and state comparison.</p>
  </blockquote>