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February 20, 2020 14:31
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Generated by XState Viz: https://xstate.js.org/viz
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| const results = [ | |
| { | |
| "category":"Entertainment: Video Games", | |
| "type":"multiple", | |
| "difficulty":"easy", | |
| "question":"Which game did "Sonic The Hedgehog" make his first appearance in?", | |
| "correct_answer":"Rad Mobile", | |
| "incorrect_answers":[ | |
| "Sonic The Hedgehog", | |
| "Super Mario 64", | |
| "Mega Man" | |
| ] | |
| }, | |
| { | |
| "category":"Science & Nature", | |
| "type":"boolean", | |
| "difficulty":"easy", | |
| "question":"Igneous rocks are formed by excessive heat and pressure.", | |
| "correct_answer":"False", | |
| "incorrect_answers":[ | |
| "True" | |
| ] | |
| }, | |
| { | |
| "category":"General Knowledge", | |
| "type":"multiple", | |
| "difficulty":"easy", | |
| "question":"Which company did Valve cooperate with in the creation of the Vive?", | |
| "correct_answer":"HTC", | |
| "incorrect_answers":[ | |
| "Oculus", | |
| "Google", | |
| "Razer" | |
| ] | |
| } | |
| ] | |
| function shuffle(array) { | |
| var currentIndex = array.length, temporaryValue, randomIndex; | |
| // While there remain elements to shuffle... | |
| while (0 !== currentIndex) { | |
| // Pick a remaining element... | |
| randomIndex = Math.floor(Math.random() * currentIndex); | |
| currentIndex -= 1; | |
| // And swap it with the current element. | |
| temporaryValue = array[currentIndex]; | |
| array[currentIndex] = array[randomIndex]; | |
| array[randomIndex] = temporaryValue; | |
| } | |
| return array; | |
| } | |
| function getQuestionsAndRandomize(context) { | |
| return new Promise((resolve, reject) => { | |
| setTimeout( function() { | |
| resolve(shuffle(results)) | |
| }, 250) | |
| }) | |
| // return fetch('/api/users/${context.userId}').then(response => | |
| // response.json() | |
| // ); | |
| } | |
| const incrementDisplayedQuestions = assign({ | |
| answers: (context, event) => ({ | |
| ...context.answers, | |
| total:context.answers.total + 1 | |
| }) | |
| }); | |
| const pickNextQuestion = assign({ | |
| display: (context, event) => { | |
| const questionIndex = context.display === null ? 0 : context.display.index+1 | |
| return { | |
| ...context.data[questionIndex], | |
| index: questionIndex | |
| } | |
| }, | |
| }) | |
| const logResponse = assign({ | |
| answers: ({ answers, display }, {payload}) => { | |
| const {correct, incorrect} = answers | |
| const isCorrect = payload === display.correct_answer | |
| const correctCount = isCorrect?correct+1:correct | |
| const incorrectCount = isCorrect?incorrect:incorrect+1 | |
| return { | |
| ...answers, | |
| correct: correctCount, | |
| incorrect: incorrectCount | |
| } | |
| } | |
| }) | |
| const calculateScore = assign({ | |
| answers: ({answers}, event) => { | |
| const { correct, total } = answers | |
| const ratio = correct/total | |
| return { | |
| ...answers, | |
| score: ratio.toFixed(2) | |
| } | |
| } | |
| }) | |
| const quizMachine = Machine({ | |
| id: 'quiz', | |
| initial: 'idle', | |
| context: { | |
| data: [], | |
| display: null, | |
| answers: { | |
| correct: 0, | |
| incorrect: 0, | |
| total: 0, | |
| score: 0 | |
| } | |
| }, | |
| states: { | |
| idle: { | |
| on: { | |
| START: 'gettingQuestions' | |
| } | |
| }, | |
| gettingQuestions: { | |
| invoke: { | |
| src: 'getQuestionsAndRandomize', | |
| onDone: { | |
| target: 'question', | |
| actions: assign({ | |
| data: (context, event) => event.data | |
| }) | |
| } | |
| } | |
| }, | |
| question: { | |
| entry: ['incrementDisplayedQuestions', 'pickNextQuestion'] | |
| , | |
| on: { | |
| NEXT: [ | |
| { | |
| target: 'summary', | |
| cond: (context, event) => context.data.length === context.answers.total, | |
| actions: 'calculateScore' | |
| }, | |
| { target: 'question' } | |
| ] | |
| }, | |
| exit: ['logResponse'] | |
| }, | |
| summary: { | |
| on:{ | |
| RESTART: 'question' | |
| } | |
| } | |
| } | |
| }, { | |
| actions: {incrementDisplayedQuestions,pickNextQuestion, logResponse, calculateScore}, | |
| services: { | |
| getQuestionsAndRandomize | |
| } | |
| }); | |
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