covidassist/src/store/index.js

import Vue from 'vue'
import Vuex from 'vuex'
import axios from 'axios';
import router from "@/router";


Vue.use(Vuex)

export default new Vuex.Store({
    state: {
        currentQuestion: 0,
        answers: [],
        questions: []
    },
    mutations: {
        nextQuestion() {
            if (this.state.currentQuestion <
                this.state.questions.length - 1)
                this.state.currentQuestion += 1
            else {
                router.push('/results')
            }
        },
        previousQuestion() {
            if (this.state.currentQuestion > 0) {
                this.state.currentQuestion -= 1
            }
        },
        answerQuestion(state, value) {
            this.state.answers[this.state.currentQuestion] = value
        },
        init() {
            axios.get('https://avian-safeguard-214619.firebaseio.com/questions.json')
                .then(res => {
                    console.log(res)
                    this.state.questions = res.data
                    this.state.answers = Array.apply(0, Array(res.data.length)).map(function () {})
                })
        }
    },
    getters: {
        numberQuestions: (state) => {
            return state.questions.length
        }
    },
    actions: {
    },
    modules: {}
})