Promises

Question 1

What are the three states a Promise can be in?

Answer 1

pending, fulfilled, rejected

Question 2

How do you handle the fulfillment of a Promise?

Answer 2

use the .then method and then you pass in an anonymous arrow functions

Question 3

How do you handle the rejection of a Promise?

Answer 3

by calling the .catch( ) method, and take a function as its argument

Question 4

What does fetch( ) return?

Answer 4

returns or fetches resources asynchronously across the network, init is optional which is an object containing any custom settings that you want to apply to the request
(returns a promise)

Question 5

What is the default request method used by fetch( )?

Answer 5

GET is the default request method

Question 6

How do you specify the request method (GET, POST etc.) when calling fetch?

Answer 6

add a second parameter with request method = init . ex: fetch(resource [, init])

Question 7

When does React call component’s componentDidMount method?

Answer 7

invoked immediately after a component is mounted or inserted into the tree. If you need to load data from a remote endpoint, this a good place to instantiate the network request.(after first successful render)

Question 8

Name three React.Component life cycle methods

Answer 8

mounting, updating, unmounting

Question 9

How do you pass data to a child component?

Answer 9

by using this.state.(__) in the parent component then this.prop.data in the child component