kara/app.js

let kara = new Vue({
    el: '#kara',
    data: {
        features: {
            changeName: false,
            themes: false,
            setNameAtStart: true
        },
        documentation: '',
        messages: [],
        talk: false,
        lastMessage: null,
        lastMessageData: {},
        name: 'Kara',
        location: null,
        chatbox: null,
        isTyping: false,
        askedForName: false,
        awaitTodo: false,
        username: '',
        themes: null,
        activeTheme: 'slate',
        addModal: {
            includeAll: false,
            keywords: '',
            responses: [
                'Answer #1'
            ]
        },
        settingsModal: {
            name: null,
            username: null,
            location: ''
        },
        todos: [],
        reactions: []
    },
    mounted() {
        this.getSavedData();
        this.getReactions();
        this.getDocumentation();

        if (this.features.themes) {
            this.getBootswatchThemes();
        }

        this.settingsModal = {
            name: this.name,
            username: this.username,
            location: this.location
        };

        if (!this.username || this.username === "null") {
            this.initialGreeting();

            if (this.features.setNameAtStart) {
                this.askForName();
            }

            this.stopTyping();
        } else {
            this.welcomeBack();
        }

        document.getElementById('chatinput').focus();
        document.title = this.name;

        this.scrollDown();
    },
    methods: {
        // Initial
        initialGreeting() {
            this.botMessage(
                this.oneOf(
                    [
                        "Hi! I'm " + this.name + ". :)",
                        "Hi, nice to meet you! My name is " + this.name + ". :)"
                    ]
                ),
                false
            );
        },
        welcomeBack() {
            this.botMessage(
                this.oneOf(
                    [
                        "Hi! Haven't heard of you in a while. :)",
                        "Welcome back! :)",
                        "Hey :) Good to see you :)",
                    ]
                ),
                false
            );
        },

        // Name
        askForName() {
            this.botMessage(
                this.oneOf([
                    'May i ask for your name?',
                    'Whats your name? :)',
                    'How can i call you?',
                    'How did your developers call you? :)'
                ]),
                false
            );

            this.askedForName = true;
        },
        setName(message) {
            this.username = message.trim();
            this.settingsModal.username = this.username;
            this.askedForName = false;

            this.botMessage(
                this.oneOf([
                    "That's a beautiful name!",
                    "Okay, i'll call you " + this.username + " from now on :)",
                    "Nice to meet you, " + this.username + ". :D"
                ])
            )
        },

        // Messages / Chat
        addMessage(body, bot, me = false) {
            this.messages.push({
                body: body,
                bot: bot,
                command: body.search('/') === 0,
                me: me,
                time: Date.now()
            })
        },
        addImageMessage(imageObject, bot) {
            this.lastMessageData = imageObject;

            this.messages.push({
                body: imageObject.body,
                bot: bot,
                src: imageObject.src

            });

            setTimeout(() => {
                this.scrollDown();
            }, 1000);

            this.stopTyping();
            this.updateStorage();
        },
        botMessage(message, save = true) {
            this.addMessage(message, true);

            if (this.talk) {
                this.say(message);
            }

            this.stopTyping();

            if (save) {
                this.updateStorage();
            }
        },
        userMessage(body) {
            this.addMessage(body, false);
            this.lastMessage = body;

            this.updateStorage();
        },
        sendMessage() {
            if (this.chatbox.trim() === '') {
                return false;
            }

            if (this.chatbox.search('/me') !== 0) {
                this.userMessage(this.chatbox);
            }
            this.scrollDown();
            this.react(this.chatbox);
            this.chatbox = '';
        },
        meMessage(message) {
            this.addMessage(this.username  + ' ' + message, false, true);
            this.react(message, true);
        },
        react(message, recursive = false) {
            this.startTyping();

            if (message.search('/') === 0 && !recursive) {
                setTimeout(() => {
                    this.processCommands(message);
                    this.scrollDown();
                }, 1000);
            } else {
                setTimeout(() => {
                    // Check commands
                    if (this.askedForName === true) {
                        this.setName(message);
                    } else if (this.awaitTodo === true) {
                        this.saveTodo(message);
                    } else {
                        let answer = this.getReaction(message);
                        if (answer) {
                            this.botMessage(answer);
                        }

                        this.updateStorage();
                    }

                    this.scrollDown();
                }, 1800);
            }
        },
        getReaction(message) {
            let preserveLastMessageData = false;
            message = this.cleanupMessage(message);

            let keywords = message.split(' ');
            let answer = undefined;

            if (this.lastMessageData.joke && this.includesOneOf(keywords, ['another', 'more'])) {
                this.tellJoke(this.lastMessageData.category);
                return false;
            }

            if (this.lastMessageData.meme && this.includesOneOf(keywords, ['another', 'more'])) {
                this.getRandomMeme(this.lastMessageData.category);
                return false;
            }

            if (this.lastMessageData.isJeopardy) {
                if (this.includesAllOf(keywords, ['give', 'up'])) {
                    this.lastMessageData = {};
                    return 'The right question would have been: "' + this.lastMessageData.question + '"';
                }

                if (this.isSimilar(message, this.lastMessageData.question)) {
                    this.lastMessageData = {};
                    return this.oneOf([
                        'Wow! This is the right question.',
                        'Correct!'
                    ]);
                } else {
                    return this.oneOf([
                        "Sorry, that's not correct.",
                        "That's not what we're searching for.",
                        "Nope, sorry. You can always give up by typing \"I give up\" if you wan't to.",
                    ]);
                }
            }

            if (this.lastMessageData.isTrivia) {
                if (this.includesAllOf(keywords, ['give', 'up'])) {
                    this.lastMessageData = {};
                    return this.oneOf([
                        'The right answer would have been: "' + this.lastMessageData.question + '"'
                    ]);
                }

                if (this.isSimilar(message, this.lastMessageData.answer)) {
                    this.lastMessageData = {};
                    return this.oneOf([
                        'Congratulations! This is the correct answer.',
                        'Correct!'
                    ]);
                } else {
                    return this.oneOf([
                        "Sorry, that's not correct.",
                        "That's not what we're searching for.",
                        "Nope, sorry. You can always give up by typing \"I give up\" if you wan't to.",
                    ]);
                }
            }

            if (!preserveLastMessageData) {
                this.lastMessageData = {};
            }

            if (this.includesAllOf(keywords, ['change', 'my', 'name'])) {
                this.askedForName = true;
                return "Please tell me how i should call you.";
            }

            if (this.includesAllOf(keywords, ['new', 'todo']) ||
                this.includesAllOf(keywords, ['new', 'task']) ||
                this.includesAllOf(keywords, ['take', 'todo']) ||
                this.includesAllOf(keywords, ['save', 'to', 'clipboard'])
            ) {
                this.awaitTodo = true;
                return this.oneOf([
                    "What do you wan't me to save for you?",
                    "Tell me what you wan't to save.",
                    "What is it you wan't to save?",
                ]);
            }

            if (this.includesAllOf(keywords, ['clear', 'chat'])) {
                this.clearChat();
                return false;
            }

            if (this.includesAllOf(keywords, ['play']) &&
                this.includesOneOf(keywords, ['quiz', 'trivia'])
            ) {
                this.startQuiz();
                return false;
            }

            if (this.includesAllOf(keywords, ['play', 'jeopardy'])) {
                this.startJeopardy();
                return false;
            }

            if (this.includesAllOf(keywords, ['roll', 'dice'])) {
                this.rollDice();
                return false;
            }

            if (this.includesAllOf(keywords, ['clear', 'chat'])) {
                this.clearChat();
                return false;
            }

            if (this.includesAllOf(keywords, ['weather']) &&
                this.includesOneOf(keywords, ['how','hows', 'what', 'whats'])
            ) {
                this.checkWeather();
                return false;
            }

            if (this.includesAllOf(keywords, ['knock', 'joke'])) {
                this.tellJoke('knock-knock');
                return false;
            }

            if (this.includesAllOf(keywords, ['joke']) && this.includesOneOf(keywords, ['coding', 'programming', 'code', 'it'])) {
                this.tellJoke('programming');
                return false;
            }

            if (this.includesAllOf(keywords, ['birb', 'meme'])) {
                this.getRandomMeme('birbmemes');
                return false;
            }

            if (this.includesAllOf(keywords, ['anime', 'meme'])) {
                this.getRandomMeme('animememes');
                return false;
            }

            if (this.includesAllOf(keywords, ['coding', 'meme'])) {
                this.getRandomMeme('codingmemes');
                return false;
            }

            if (this.includesAllOf(keywords, ['dank', 'meme'])) {
                this.getRandomMeme('dankmemes');
                return false;
            }

            if (this.includesAllOf(keywords, ['meme']) &&
                this.includesOneOf(keywords, ['get', 'send'])
            ) {
                this.getRandomMeme();
                return false;
            }

            if (this.includesAllOf(keywords, ['joke']) && this.includesOneOf(keywords, ['coding', 'programming', 'code', 'it'])) {
                this.tellJoke('programming');
                return false;
            }

            if (this.includesAllOf(keywords, ['tell', 'joke']) ||
                this.includesAllOf(keywords, ['something', 'funny']) ||
                this.includesAllOf(keywords, ['cheer', 'me', 'up'])
            ) {
                this.tellJoke('general');
                return false;
            }

            if (this.includesAllOf(keywords, ['whats', 'the', 'time']) || this.includesAllOf(keywords, ['how', 'late'])) {
                return "It's " + moment().format('LT');
            }

            if (this.includesAllOf(keywords, ['what', 'day', 'it'])) {
                return "It's " + moment().format('dddd') + ".";
            }

            if (this.includesAllOf(keywords, ['what', 'date', 'it']) || this.includesAllOf(keywords, ['whats', 'the', 'date'])) {
                return "It's " + moment().format('dddd') + ", " + moment().format('MMMM Do YYYY') + ".";
            }

            this.reactions.forEach((reactionOption) => {
                if (reactionOption.includeAll === true) {
                    if (this.includesAllOf(keywords, reactionOption.keywords)) {
                        answer = this.oneOf(reactionOption.responses);
                    }
                } else {
                    if (this.includesOneOf(keywords, reactionOption.keywords)) {
                        answer = this.oneOf(reactionOption.responses);
                    }
                }
            });

            if (answer) {
                return answer;
            }

            this.rsaBackupAnswer(message);
        },

        // Forms
        saveSettings() {
            this.name = this.settingsModal.name;
            this.username = this.settingsModal.username;
            this.location = this.settingsModal.location;
            this.updateStorage();

            this.scrollDown();
        },

        // Commands
        processCommands: function (message) {
            if (this.checkForCommands(message, 'todo')) {
                let todoToSave = this.checkForCommands(message, 'todo');
                this.saveTodo(todoToSave);
            }

            if (this.checkForCommands(message, 'clear')) {
                this.clearChat();
            }

            if (this.checkForCommands(message, 'weather')) {
                this.checkWeather();
            }

            if (this.checkForCommands(message, 'joke')) {
                this.tellJoke(this.checkForCommands(message, 'joke'));
            }

            if (this.checkForCommands(message, 'meme')) {
                this.getRandomMeme(this.checkForCommands(message, 'meme'));
            } else if (this.checkForCommands(message, 'me ')) {
                this.meMessage(this.checkForCommands(message, 'me '));
            }

            let animals = [
                {animal: 'birb', emoji: '🐦'},
                {animal: 'dog', emoji: '🐶'},
                {animal: 'cat', emoji: '🐱'},
                {animal: 'fox', emoji: '🦊'},
                {animal: 'panda', emoji: '🐼'},
                {animal: 'red_panda', emoji: '🤩'},
                {animal: 'koala', emoji: '🐨'}
            ];

            animals.forEach((animal) => {
                if (this.checkForCommands(message, animal.animal + 'Img')) {
                    this.rsaRandomAnimalImage(animal.animal, animal.emoji);
                }

                if (this.checkForCommands(message, animal.animal + 'Fact')) {
                    this.rsaRandomAnimalFact(animal.animal, animal.emoji);
                }
            });

            animals.forEach((animal) => {
                if (this.checkForCommands(message, animal.animal)) {
                    this.rsaRandomAnimalImage(animal.animal, animal.emoji);
                }
            });

            if (this.checkForCommands(message, 'lyrics')) {
                this.rsaLyrics(this.checkForCommands(message, 'lyrics'));
            }

            if (this.checkForCommands(message, 'quiz')) {
                this.startQuiz();
            }

            if (this.checkForCommands(message, 'jeopardy')) {
                this.startJeopardy();
            }

            if (this.checkForCommands(message, 'dice')) {
                this.rollDice();
            }

            if (this.checkForCommands(message, 'talk')) {
                this.talk = !this.talk;
            }

            if (this.checkForCommands(message, 'say')) {
                this.botMessage(this.checkForCommands(message, 'say'))
            }

            this.lastMessage = message;
        },
        checkForCommands(message, commands) {
            if (!Array.isArray(commands)) {
                commands = [commands];
            }

            let commandFound = false;
            let parameter = false;

            commands.forEach((command) => {
                if (commandFound) {
                    return;
                }
                let commandString = '/' + command.toLowerCase();

                if (message.search(commandString) === 0) {
                    parameter = message.replace(commandString, '').trim();
                    commandFound = true;
                }
            });

            return parameter ? parameter : commandFound;
        },
        checkWeather() {
            let Kara = this;

            if (!Kara.location) {
                Kara.botMessage('Please set your location in the settings. ⚙');
                return;
            }

            let city = this.location.toLowerCase();
            let url = 'http://api.openweathermap.org/data/2.5/weather?q=' + city + '&appid=8a1aa336da8899c1038bf6bd808d8961&units=metric';

            axios.get(url)
                .then(function (response) {
                    Kara.botMessage('In ' + response.data.name + ' it\'s ' + response.data.main.temp.toFixed() + '°C with ' + response.data.weather[0].description + '.');
                })
                .catch(function (error) {
                    alertify.notify(error, 'danger');
                    Kara.botMessage('I couldn\'t check the weather for your location. 🤔');
                })

            this.updateStorage();
        },
        getRandomMeme(category = 'memes') {
            let Kara = this;
            let url = 'https://meme-api.herokuapp.com/gimme/';

            let categorySet = false;

            if (category !== true && category !== false) {
                category = category.trim();
                categorySet = true;
            } else {
                category = 'memes'
            }

            axios.get(url + category)
                .then(function (response) {
                    Kara.addImageMessage({
                        body: response.data.title,
                        src: response.data.url
                    }, true);

                    Kara.lastMessageData = {
                        meme: true,
                        category: category
                    };
                })
                .catch(function (error) {
                    Kara.botMessage("Hmm.. i can't think of any good memes right now, sorry.. 😞");
                })

            this.updateStorage();
        },
        tellJoke(category) {
            let Kara = this;
            let categorySet = false;

            if (category !== true && category !== false) {
                category = category.trim();
                categorySet = true;
            } else {
                category = 'general'
            }

            let url = 'https://official-joke-api.appspot.com/jokes/' + category + '/random';

            axios.get(url)
                .then(function (response) {
                    let joke = response.data[0];

                    Kara.botMessage(joke.setup);

                    setTimeout(() => {
                        Kara.botMessage(joke.punchline);
                        Kara.scrollDown();
                    }, 3500);

                    Kara.lastMessageData = {
                        joke: true,
                        category: category
                    };
                })
                .catch(function (error) {
                    console.log(error);

                    if (categorySet) {
                        Kara.botMessage("Sorry, i don't know any jokes about this topic.. 🙄");
                    } else {
                        Kara.botMessage("I can't remember any jokes right now, sorry. 😢");
                    }
                });

            this.updateStorage();
        },
        startQuiz() {
            let Kara = this;
            let url = 'https://jservice.io/api/random';

            axios.get(url)
                .then(function (response) {
                    let clue = response.data[0];

                    Kara.botMessage('Okay! Here is your question from the category "' + clue.category.title + '":');
                    Kara.botMessage(clue.question);

                    Kara.lastMessageData = {
                        isTrivia: true,
                        answer: clue.answer
                    };
                })
                .catch(function (error) {
                    Kara.botMessage("It's not a good time for a quiz.");
                });

            this.updateStorage();
        },
        startJeopardy() {
            let Kara = this;
            let url = 'https://jservice.io/api/random';

            axios.get(url)
                .then(function (response) {
                    let clue = response.data[0];

                    Kara.botMessage('Okay! Here we go. The category is "' + clue.category.title + '":');
                    Kara.botMessage(clue.answer);

                    Kara.lastMessageData = {
                        isJeopardy: true,
                        question: clue.question
                    };
                })
                .catch(function (error) {
                    Kara.botMessage("It's not a good time for a quiz.");
                });

            this.updateStorage();
        },
        rollDice() {
            let dice = Math.random()*6;

            if (dice < 1) {
                dice = 1;
            } else {
                dice = Math.floor(dice);
            }

            this.addImageMessage({
                body: dice + '!',
                src: 'img/' + dice + '.png'
            }, true);

            this.updateStorage();
        },

        // Todos
        saveTodo(message) {
            this.awaitTodo = false;

            this.todos.push({
                time: moment(),
                body: message,
                checked: false
            });

            this.updateStorage();

            this.botMessage(
                this.oneOf([
                    "Saved! :)",
                    "You can read and check your todos in the clipboard-section. :)"
                ])
            )
        },
        clearTodos() {
            this.todos = [];

            this.botMessage(
                this.oneOf([
                    "Todos cleared. 🚮"
                ])
            );

            this.updateStorage();
        },

        // Some Random API Commands
        rsaRandomAnimalImage(animal, emoji = '😄') {
            let Kara = this;

            Kara.startTyping();

            axios.post('/api/curlJson', {
                url: 'https://some-random-api.ml/img/' + animal
            })
            .catch((error) => {
                Kara.botMessage("Sorry, i can't find any good pictures right now 🙁" + emoji);
            })
            .then((response) => {
                Kara.addImageMessage({
                    body: emoji,
                    src: response.data.link
                }, true);
            })
        },
        rsaRandomAnimalFact(animal, emoji = '😄') {
            let Kara = this;

            Kara.startTyping();

            axios.post('/api/curlJson', {
                url: 'https://some-random-api.ml/facts/' + animal
            })
            .catch((error) => {
                Kara.botMessage("Sorry, i can't think of any good facts right now 🙁" + emoji);
            })
            .then((response) => {
                Kara.botMessage(response.data.fact);
            })
        },
        rsaLyrics(searchFor) {
            let Kara = this;

            Kara.startTyping();

            axios.post('/api/curlJson', {
                url: 'https://some-random-api.ml/lyrics/?title=' + searchFor.replace(' ', '%20')
            })
            .catch((error) => {
                Kara.botMessage("Hmm.. i just can't remember the lyrics, but i love that song! 🎵🎧");
            })
            .then((response) => {
                Kara.addImageMessage({
                    body: "Here you go!<br>" +
                        "<br>" +
                        response.data.title + ' from ' + response.data.author + '<br>' +
                        '<br>' +
                        response.data.lyrics,
                    src: response.data.thumbnail.genius
                }, true);
            })
        },
        rsaBackupAnswer(message) {
            let Kara = this;

            Kara.startTyping();

            axios.post('/api/curlJson', {
                url: 'https://some-random-api.ml/chatbot?message=' + message
            })
            .catch((error) => {
                Kara.botMessage("I don't know what to say..");
            })
            .then((response) => {
                Kara.botMessage(response.data.response);
            });
        },

        // LocalStorage
        getSavedData() {
            let savedName = localStorage.getItem('name');

            this.name = savedName ? savedName : this.name;

            let savedUsername = localStorage.getItem('username');
            this.username = savedUsername ? savedUsername : null;

            let savedActiveTheme = localStorage.getItem('activeTheme');
            this.activeTheme = savedActiveTheme ? savedActiveTheme : 'slate';

            let savedMessages = JSON.parse(localStorage.getItem('messages'));
            this.messages = savedMessages ? savedMessages : [];

            let savedTodos = JSON.parse(localStorage.getItem('todos'));
            this.todos = savedTodos ? savedTodos : [];

            let savedLastMessage = JSON.parse(localStorage.getItem('lastMessage'));
            this.lastMessage = savedLastMessage ? savedLastMessage : null;

            let savedLocation = JSON.parse(localStorage.getItem('location'));
            this.location = savedLocation ? savedLocation : null;

            this.scrollDown();
        },
        updateStorage() {
            localStorage.setItem('name', this.name);
            localStorage.setItem('username', this.username);
            localStorage.setItem('activeTheme', this.activeTheme);
            localStorage.setItem('messages', JSON.stringify(this.messages));
            localStorage.setItem('answers', JSON.stringify(this.reactions));
            localStorage.setItem('todos', JSON.stringify(this.todos));
            localStorage.setItem('lastMessage', JSON.stringify(this.lastMessage));
            localStorage.setItem('location', JSON.stringify(this.location));
        },
        clearStorage() {
            localStorage.clear();
            location.reload();
        },

        // Utility
        scrollDown() {
            $('#chat-box').stop().animate({
                scrollTop: ($('#chat-box')[0].scrollHeight * 10)
            }, 800);
        },
        startTyping() {
            this.isTyping = true;
        },
        stopTyping() {
            this.scrollDown();
            this.isTyping = false;
        },
        oneOf(answers) {
            let amountOfAnswers = answers.length;
            let randomIndex = Math.floor(Math.random() * (amountOfAnswers));

            return this.convertWildcards(answers[randomIndex]);
        },
        convertWildcards(message) {
            message = message.replace('$name$', this.username);
            message = message.replace('$botname$', this.name);

            return message;
        },
        cleanupMessage(message) {
            message = message.toLowerCase();
            return message.replace('?', '')
                .replace('!', '')
                .replace('.', '')
                .replace(',', '')
                .replace('-', '')
                .replace('_', '')
                .replace('#', '')
                .replace('\'', '')
                .replace('"', '')
                .replace('+', '')
                .replace('*', '')
                .replace('§', '')
                .replace('$', '')
                .replace('%', '')
                .replace('&', '')
                .replace('/', '')
                .replace('(', '')
                .replace(')', '')
                .replace('=', '')
                .replace('\\', '')
                .replace('@', '')
                .replace('~', '')
                .replace('…', '');
        },
        clearChat() {
            this.messages = [];
            this.botMessage(this.oneOf([
                'Chat cleared.',
                'Evidence destroyed.',
                'Mind cleared.',
                'Uhm.. i think forgot everything we ever talked about.. oops.',
                'A fresh start!',
                "You've got something to hide? Nevermind, gotcha fam. Chat is cleared now. 🐱‍👤"
            ]));

            this.updateStorage();
        },
        includesOneOf(keywords, wordsToSearch) {
            let includes = false;

            wordsToSearch.forEach((searchWord) => {
                if (keywords.includes(searchWord)) {
                    includes = true;
                }
            })

            return includes;
        },
        includesAllOf(keywords, wordsToSearch) {
            let includesAllkeywords = true;

            wordsToSearch.forEach((searchWord) => {
                if (!keywords.includes(searchWord)) {
                    includesAllkeywords = false;
                }
            })

            return includesAllkeywords;
        },

        // Ajax calls for saving/receiving reactions, documentation & themes
        getBootswatchThemes() {
            let Kara = this;

            axios.get('https://bootswatch.com/api/4.json')
                .then(function (response) {
                    Kara.themes = response.data.themes;
                })
                .catch(function (error) {
                    console.log(error);
                })
        },
        getReactions() {
            let Kara = this;

            axios.get('/reactions/get').then((response) => {
                response.data.forEach((reaction) => {
                    Kara.reactions.push(JSON.parse(reaction.reaction));
                });
            }).catch((error) => {
                console.log(error);
            });
        },
        getDocumentation() {
            let Kara = this;

            axios.get('/api/kara/documentation').then((response) => {
                Kara.documentation = response.data;
            }).catch((error) => {
                console.log(error);
            });
        },

        // Levenshtein distance
        isSimilar(message1, message2) {
            let longer = message1;
            let shorter = message2;

            if (message1.length < message2.length) {
                longer = message2;
                shorter = message1;
            }

            const longerLength = longer.length;
            if (longerLength === 0) {
                return 1.0;
            }

            let similarity = (longerLength - this.editDistance(longer, shorter)) / parseFloat(longerLength);

            return similarity > 0.65;
        },

        editDistance: function (message1, message2) {
            message1 = message1.toLowerCase();
            message2 = message2.toLowerCase();

            let costs = [];
            for (let i = 0; i <= message1.length; i++) {
                let lastValue = i;
                for (let j = 0; j <= message2.length; j++) {
                    if (i === 0)
                        costs[j] = j;
                    else {
                        if (j > 0) {
                            let newValue = costs[j - 1];
                            if (message1.charAt(i - 1) !== message2.charAt(j - 1))
                                newValue = Math.min(Math.min(newValue, lastValue),
                                    costs[j]) + 1;
                            costs[j - 1] = lastValue;
                            lastValue = newValue;
                        }
                    }
                }
                if (i > 0) {
                    costs[message2.length] = lastValue;
                }
            }

            return costs[message2.length];
        },

        // Speech
        say(message) {
            var speech = new SpeechSynthesisUtterance();

            // Set the text and voice attributes.
            speech.text = message;
            speech.volume = 1;
            speech.rate = 1;
            speech.pitch = 1;

            window.speechSynthesis.speak(speech);
        },
    }
})