vuejs_course/2021-05-04_vuex-01-starting-setup/src/store.js

import { createStore } from 'vuex';

const store = createStore({
  state() {
    return {
      counter: 0
    };
  },
  mutations: {
    increment(state) {
      state.counter = state.counter + 1;
    },
    increase(state, payload) {
      state.counter = state.counter + payload.value;
    }
  },
  getters: {
    finalCounter(state) {
      return state.counter * 3;
    },
    normalizedCounter(_, getters) {
      const finalCounter = getters.finalCounter;
      if (finalCounter < 0) {
        return 0;
      }
      if (finalCounter > 100) {
        return 100;
      }
      return finalCounter;
    }
  }
});

export default store;