Redux

Question 1

What is the first principle of Redux?

Answer 1

A Single Source of Truth: The single immutable state tree. The whole state of your application is stored as a single JavaScript object.

Question 2

What is an action in Redux?

Answer 2

• Actions are payloads of information that send data from your application to your store.
• They are the only source of information for the store.
• Actions are plain JavaScript objects.
• Actions must have a type property that indicates the type of action being performed.

Question 3

What is the second principle of Redux?

Answer 3

State is Read-Only: The only way to change the state is to emit an action, an object describing what happened.

Question 4

What is the third principle of Redux?

Answer 4

Changes are made with pure functions: To specify how the state tree is transformed by actions, you write pure reducers.

Question 5

What is a reducer in Redux?

Answer 5

Reducers are just pure functions that take the previous state and an action, and return the next state.