React Redux Weather App
An intermediate tutorial app aimed at furthering React and Redux concepts and knowledge.
The following README.md is to consolidate the key learning points for future reference.
The tutorial can be found here
Key Learning Points
Middleware
- Functions that run in between actions and reducers.
Redux-Promise Middleware
- Checks if action payload is a promise.
- If the payload contains a promise, Redux-Promise will stop the data flow, wait for the promise to resolve before creating a new action to be sent to reducers.
- This keeps reducers functions simple, dumb and to only handle updating application state.
- Minimises asynchronous code and keeps code clean (supposedly).
Keeping State Immutable
- Be mindful in avoiding state mutations
- Never change the state directly
- Always return a new object/state to the reducer.
// Returns a mutated state - Avoid!
state.push(action.payload.data);
// Returns a new object/state
// Appends new data to end of array
state.concat([ action.payload.data ]);
// Appends new data to start of array
[ action.payload.data, ...state ];