Number Guessing Game A simple number guessing game implemented in JavaScript. The game prompts the user to specify the range of numbers and the number of attempts they want to make. Then, it generates a random number within the specified range, and the user tries to guess the secret number within the given number of attempts. The game provides f…

guessing-game.js

// Require the 'readline' module to handle user input.
readline = require('node:readline');

/**
 * Create an interface for reading user input from the console.
 * @type {readline.Interface}
 */
const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout // Use process.stdout for output
});

/************************************************************* */
/**
 * The secret number for the guessing game.
 * @type {number}
 */
let secretNumber = 0;

/**
 * The number of attempts for the guessing game.
 * @type {number}
 */
let numAttempts = 5;

/**
 * Check if a value is a valid numeric value (not NaN and of type 'number').
 *
 * @param {*} value - The value to be checked.
 * @returns {boolean} - True if the value is a valid number, false otherwise.
 */
function isValidValue(value) {
    return typeof value === 'number' && !isNaN(value);
}

/**
 * Check if the user's guess is correct.
 * 
 * @param {number} guess - The user's guess to be checked
 * @returns {boolean} - True if the guess is correct, false otherwise
 */
let checkGuess = (guess) => {
    if (isValidValue(guess)) {
        if (guess > secretNumber) {
            console.log(`Too High, Attempts Left: ${numAttempts}`);
            return false;
        } else if (guess < secretNumber) {
            console.log(`Too Low, Attempts Left: ${numAttempts}`);
            return false;
        } else {
            console.log('Correct');
            return true;
        }
    } else {
        console.log('Invalid input. Please enter a valid number.');
        return false;
    }
}

/**
 * Ask the user for their guess in recurse until they get it right.
 */
const askGuess = () => {
    --numAttempts;
    console.log('Guess Must be a number');
    rl.question('Enter a guess: ', (answer) => {
        // Convert the user's input to a number and check if it's correct.
        if (numAttempts > 0) {
            if (!checkGuess(Number(answer))) {
                askGuess()
            } else {
                console.log('You win!')
                rl.close(); // Close the input interface when the guess is correct.
            }
        } else {
            console.log('You Lose');
            rl.close();
        }
    });
}

/**
 * Generates a random integer within a specified range, inclusive.
 *
 * @param {number} minNumber - The minimum value in the range.
 * @param {number} maxNumber - The maximum value in the range.
 * @returns {number} - A random integer between minNumber and maxNumber (inclusive).
 */
const randomInRange = (minNumber, maxNumber) => {
    minNumber = Math.ceil(minNumber);
    maxNumber = Math.floor(maxNumber);

    return Math.floor(Math.random() * (maxNumber - minNumber + 1) + minNumber); // The maxNumber and minNumber inclusive;
}

/**
 * Prompt the user to enter a range (min and max numbers) for the random number.
 * Once the range is entered, generate a random number within that range and start the guessing game.
 */
const askRange = () => {
    rl.question('Enter a max number: ', (max) => {
        rl.question('Enter a min number: ', (min) => {
            if (isValidValue(Number(max)) && isValidValue(Number(min))) {
                if (min >= max || min + 1 === max) {
                    console.log("The first number should be at least 2 digits smaller than the second number. Try again.")
                    askRange();
                } else {
                    // Generate a random number within the specified range.
                    console.log(`I'm thinking of a number between ${min} and ${max}...`);
                    secretNumber = randomInRange(Number(min), Number(max));

                    // Start the guessing game.
                    askGuess();
                }
            } else {
                console.log('Invalid input. Please enter valid numbers for max and min.');
                // You may choose to ask for input again or handle this case as appropriate.
                askRange()
            }

        })
    })
}

/**
 * Prompt the user to specify the number of attempts they want to make in the guessing game.
 * If the user provides a valid numeric input, the game is started with the specified number of attempts.
 * If the input is not a valid number, an error message is displayed, and the program exits.
 */
const asklimit = () => {
    rl.question('How many attempts do you want to make? ', (answer) => {
        if (isValidValue(Number(answer))) {
            numAttempts = Number(answer);
            askRange();
        } else {
            console.log('Attempts must be a number');
            rl.close();
        }
    });
}

// Start Game
asklimit()

// https://my.appacademy.io/lessons/user-input/0e404b7c/practices/guessing-game-project/d236f9b6
// https://gist.github.com/TheSaviourEking/89c64ab0cf2561f0db70597347d9721c