redux

simple-counter

import { createStore } from 'redux';

const geometricProgressionRatio = 2;
const arithmeticProgressionRatio = 2;

const geometricProgression = {
  type: "GEOMETRIC_PROGRESSION",
  by: geometricProgressionRatio
};
const arithmeticProgression = {
  type: "ARITHMETIC_PROGRESSION",
  by: arithmeticProgressionRatio
};

function counter(state = 1, action) {
  switch (action.type) {
    case 'GEOMETRIC_PROGRESSION':
      return state * action.by;
    case 'ARITHMETIC_PROGRESSION':
      return state + action.by;
    default:
      return state;
  }
}

const store = createStore(counter);

const unsubscribe = store.subscribe(() => {
  console.log(store.getState())
});

for (let i = 0; i < 10; i++) {
  store.dispatch(geometricProgression);
}

for (let i = 0; i < 10; i++) {
  store.dispatch(arithmeticProgression);
}

unsubscribe();