read02.md

React State Vs Props

1. What types of things can you pass in the props?

In react allows us to pass values from a parent component down to a child component.

2. What is the big difference between props and state?

props you pass into component (props handled outside of component ) state is handled inside that component and you can updated inside the component

3. When do we re-render our application?

• When we change the state inside of the app.
• Or change the props outside the component.

4. What are some examples of things that we could store in state?

There are many examples, such as if we have a counter app like Step counter, and we want to update the count each time you move the phone then we need state to store these updating.

React lifecycle

1. Based off the diagram, what happens first, the ‘render’ or the ‘componentDidMount’?

the (render)

2. What is the very first thing to happen in the lifecycle of React?

constructor()

3. Put the following things in the order that they happen:

• Constructor
• Render
• React Updates
• ComponentWillUnmount
• ComponentDidMount

4. What does componentDidMount do?

Load anything using a network request or initialize the DOM dom mainplution , network request