title: In reactjs, are props pass by value or pass by reference?
body: <p>As far as I can tell, if I pass a parent component state down to a child, then that child gets the live state of the parent.</p>
  
  <p>So a change made in the state of the parent is immediately also available in the child via the prop that it came on.</p>
  
  <p>Is this correct?</p>