reading-notes

Class 36 Reading: Application State with Redux

Resources

• Dan Abramov Redux Tutorials

Dan Abramov Redux Tutorials

1. What is the first principle of Redux?

   • Principle 1: The state of your whole application is stored in an object tree within a single store.
   • Principle 2: The only way to change the state is to emit an action, an object describing what happened.
   • Principle 3: To specify how the state tree is transformed by actions, you write pure reducers.

2. What is a store and what do we use our reducers for within that store?

   • A store is a single JavaScript object that holds the state of your application. The store has a method called getState that returns the current state value inside of it. The store also has a method called dispatch that accepts an action object as its argument. The store also has a method called subscribe that accepts a callback function that will be run every time an action is dispatched.

   • Reducers are functions that take the current state value and an action object as arguments, and return a new state result. In other words, (state, action) => newState.

3. Name three Redux store methods given to us by createStore and describe their use.

   • getState - returns the current state value inside of the store.
   • dispatch - accepts an action object as its argument.
   • subscribe - accepts a callback function that will be run every time an action is dispatched.

Bookmark and Review

• Worlds Easiest Guide to Redux
• Testing Reducers
• Redux Docs

Reflection

• Course Schedule
• Class README

1. Looking ahead at this module’s course schedule, what do you look forward to learning?

   • Answer 1: I look forward to learning more about Redux and how to implement it into future applications.

2. What are your learning goals after reading and reviewing the class README?

   • Goal 1: Practice Adj Matrix to Adj List conversion for the upcoming whiteboard challenge.

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