Reducer ↔ function to Reduce to new state value from Action input

Reduce

(process) to generate new state based on current state & some Action payload

References

1. Initialization Function ↔ function pass as Init Arg to useReducer() to generate Initial State for Reducer

2. Dispatch Function ↔ fn to Dispatch Action to Reducer

3. Action ↔ object with type & payload info to pass Reducer to update state

4. redux ↔ (Design Pattern) to colocate state in global external central store, to control data flow with predictable scalable pattern of Dispatch > Reducer > Store

5. Dispatch ↔ redux fn to send Action object to Reducer