react-events-and-state

Question 1

What is the purpose of state in React?

Answer 1

it controls what’s diplay ont eh page and update based on different situations.

Question 2

How to you pass an event handler to a React element?

Answer 2

you would add a react event listener to the element and pass a function as a event handler.
ex:     
button onClick={this.sayHello}
      Click me!
/button
(sayHello is the event handler)