Learn the key concepts behind React and how to use JSX elements and components to build lean and fast web front ends React, also known as ReactJS, is an open source JavaScript library for building ...

But I dove in anyway. I managed to get through the basic Facebook tutorial and some others and got some React Native apps running, but it was quite a challenging experience and I didn't feel ...

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.