javascript Alexa测验

Posted 2021-05-03

'use strict';

var Alexa = require('alexa-sdk');

var flashcardsDictionary = [
  {
    question: 'How do you find the length of a string?',
    rubyAnswer: 'length',
    pythonAnswer: 'len',
    javascriptAnswer: 'length'
  },
  {
    question: 'How do you print to the console or terminal?',
    rubyAnswer: 'puts',
    pythonAnswer: 'print',
    javascriptAnswer:'console.log'
  },
  {
    question:'Are the boolean terms true and false capitalized or lowercase?',
    rubyAnswer: 'lowercase',
    pythonAnswer: 'capitalized',
    javascriptAnswer: 'lowercase'
  }];

var DECK_LENGTH = flashcardsDictionary.length;

var handlers = {

  // Open Codecademy Flashcards
  'LaunchRequest': function() {
    if (Object.keys(this.attributes).length === 0) {
      this.attributes.flashcards = {
        'currentLanguage': '',
        'languages': {
          'ruby': {
            'numberCorrect': 0,
            'currentFlashcardIndex': 0
          },
          'python': {
            'numberCorrect': 0,
            'currentFlashcardIndex': 0
          },
          'javascript': {
            'numberCorrect': 0,
            'currentFlashcardIndex': 0
          }
        }
      };

      this.response
        .speak('Welcome to Flashcards. Do you want to test your knowledge ' +
          'in Ruby, Python, or Javascript?')
        .listen('Which language would you like to practice?'); 
      
    } else { 
      var currentLanguage = this.attributes.flashcards.currentLanguage; 
      var numberCorrect = this.attributes.flashcards.languages[currentLanguage].numberCorrect; 
      var currentFlashcardIndex = this.attributes.flashcards.languages[currentLanguage].currentFlashcardIndex;

      this.response
        .speak('Welcome back to Flashcards. You are currently working on ' +
          currentLanguage + '. You\'re on question ' + currentFlashcardIndex +
          ' and have answered ' + numberCorrect + ' correctly.' +
          ' Do you want to test your knowledge in Ruby, Python, or Javascript?')
        .listen('Which language would you like to practice?');

    }
    this.emit(':responseReady');
  },

  'SetMyLanguageIntent': function() {
    this.attributes.flashcards.currentLanguage = this.event.request.intent.slots.languages.value;
    if (this.attributes.flashcards.currentLanguage === 'JavaScript') {
      this.attributes.flashcards.currentLanguage = 'javascript';
    }
    var currentLanguage = this.attributes.flashcards.currentLanguage

    this.response
      .speak('Okay, I will ask you some questions about ' +
        currentLanguage + '. Here is your first question. ' + 
        AskQuestion(this.attributes))
      .listen(AskQuestion(this.attributes));

    this.emit(':responseReady');
  },

  // User gives an answer
  'AnswerIntent': function() {
    var currentLanguage = this.attributes.flashcards.currentLanguage;
    var currentFlashcardIndex = this.attributes.flashcards.languages[currentLanguage].currentFlashcardIndex;
    var userAnswer = this.event.request.intent.slots.answer.value;
    var languageAnswer = currentLanguage + 'Answer';
    var correctAnswer = flashcardsDictionary[currentFlashcardIndex][languageAnswer];

    if (userAnswer == correctAnswer){
      this.attributes.flashcards.languages[currentLanguage].numberCorrect++;
      var numberCorrect = this.attributes.flashcards.languages[currentLanguage].numberCorrect;
      this.attributes.flashcards.languages[currentLanguage].currentFlashcardIndex++;
      this.response
        .speak('Nice job! The correct answer is ' + correctAnswer + '. You ' +
          'have gotten ' + numberCorrect + ' out of ' + DECK_LENGTH + ' ' +
          currentLanguage + ' questions correct. Here is your next question. ' + AskQuestion(this.attributes))
        .listen(AskQuestion(this.attributes));
    } else {
      var numberCorrect = this.attributes.flashcards.languages[currentLanguage].numberCorrect;
      this.attributes.flashcards.languages[currentLanguage].currentFlashcardIndex++;
      this.response
        .speak('Sorry, the correct answer is ' + correctAnswer + '. You ' +
          'have gotten ' + numberCorrect + ' out of ' + DECK_LENGTH + ' ' +
          currentLanguage + ' questions correct. Here is your next question. ' + 
          AskQuestion(this.attributes))
        .listen(AskQuestion(this.attributes));
    }

    this.emit(':responseReady');
  },

  // Stop
  'AMAZON.StopIntent': function() {
    this.response.speak('Ok, let\'s play again soon.');
    this.emit(':responseReady');
  },

  // Cancel
  'AMAZON.CancelIntent': function() {
    this.response.speak('Ok, let\'s play again soon.');
    this.emit(':responseReady');
  },

  // Save state
  'SessionEndedRequest': function() {
    console.log('session ended!');
    this.emit(':saveState', true);
  }

};

// Test my {language} knowledge
var AskQuestion = function(attributes) {
  var currentLanguage = attributes.flashcards.currentLanguage;
  console.log('currentLanguage: ' + currentLanguage);
  console.log('flashcards: ');
  console.log(attributes.flashcards);
  var currentFlashcardIndex = attributes.flashcards.languages[currentLanguage].currentFlashcardIndex;
  console.log('currentFlashcardIndex: ' + currentFlashcardIndex);

  if (currentFlashcardIndex >= flashcardsDictionary.length) {
    return 'No questions remaining';
  } else {
    var currentQuestion = flashcardsDictionary[currentFlashcardIndex].question;
    return 'In ' + currentLanguage + ', ' + currentQuestion;
  }
};

exports.handler = function(event, context, callback){
  var alexa = Alexa.handler(event, context, callback);
  alexa.dynamoDBTableName = 'CodecademyFlashcards';
  alexa.registerHandlers(handlers);
  alexa.execute();
};