title: ReactJS bind method to class component
body: <p>Im doing ReactJS course in Codeacademny and they confused me.</p>
  
  <p>(EDIT - full code) Photo of the code :</p>
  
  <p><a href="https://i.stack.imgur.com/lbkIh.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lbkIh.png" alt="Code"></a></p>
  
  <p>and there's no constructor or anywhere call to any bind method for the <code>scream</code> class method.</p>
  
  <p>However in further exercises they tell you can't do that.</p>
  
  <p>I probably miss something.</p>