This is known in the React docs as “lifting up state.” The idea here is that when children at the same level of the component tree must share state, that state is pushed up to the parent.

React uses an immutable state object accessible only via setState() to represent component state. This is different from Vue and Angular, which employ a more built-in JavaScript approach to state ...

In this practical React tutorial, you'll learn how to build an animated multi-level dropdown menu from scratch. Inspired by modern interfaces like Facebook, this project covers the essentials of ...