Discussion on: React Beginner Question Thread ⚛

I'm provably misunderstanding something when you said:

You have a component A rendering a component B, both components are stateful. If A is a PureComponent (or manually implement shouldComponentUpdate) and B change it own state since A is not being updated (its state and props didn't changed) it's going to say that it does not need to update, which cause B not to update (because the React's rendered is going to stop traversing the internal component tree of A).

Why should B not update? Is this what you meant? codesandbox.io/s/ol4zllpj19