basic-computer-games/82_Stars/javascript/stars.js

// STARS
//
// Converted from BASIC to Javascript by Qursch
//

function print(str)
{
    document.getElementById("output").appendChild(document.createTextNode(str));
}

function input()
{
    var input_element;
    var input_str;
    
    return new Promise(function (resolve) {
                       input_element = document.createElement("INPUT");
                       
                       print("? ");
                       input_element.setAttribute("type", "text");
                       input_element.setAttribute("length", "50");
                       document.getElementById("output").appendChild(input_element);
                       input_element.focus();
                       input_str = undefined;
                       input_element.addEventListener("keydown", function (event) {
                                                      if (event.keyCode == 13) {
                                                      input_str = input_element.value;
                                                      document.getElementById("output").removeChild(input_element);
                                                      print(input_str);
                                                      print("\n");
                                                      resolve(input_str);
                                                      }
                                                      });
                       });
}

function tab(space)
{
    var str = "";
    while (space-- > 0)
        str += " ";
    return str;
}

var guesses = 7;
var limit = 100;

// Main program
async function main()
{
    print(tab(33) + "STARS\n");
    print(tab(15) + "CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY\n");
    print("\n\n\n");

    // Instructions
    print("DO YOU WANT INSTRUCTIONS? (Y/N)");
    var instructions = await input();
    if(instructions.toLowerCase()[0] == "y") {
        print(`I AM THINKING OF A WHOLE NUMBER FROM 1 TO ${limit}\n`);
        print("TRY TO GUESS MY NUMBER.  AFTER YOU GUESS, I\n");
        print("WILL TYPE ONE OR MORE STARS (*).  THE MORE\n");
        print("STARS I TYPE, THE CLOSER YOU ARE TO MY NUMBER.\n");
        print("ONE STAR (*) MEANS FAR AWAY, SEVEN STARS (*******)\n");
        print(`MEANS REALLY CLOSE!  YOU GET ${guesses} GUESSES.\n\n\n`);
    }

    // Game loop
    while (true) {

        var randomNum = Math.floor(Math.random() * limit) + 1;
        var loss = true;

        print("\nOK, I AM THINKING OF A NUMBER, START GUESSING.\n\n");
        
        for(var guessNum=1; guessNum <= guesses; guessNum++) {

            // Input guess
            print("YOUR GUESS");
            var guess = parseInt(await input());

            // Check if guess is correct
            if(guess == randomNum) {
                loss = false;
                print("\n\n" + "*".repeat(50) + "!!!\n");
                print(`YOU GOT IT IN ${guessNum} GUESSES!!! LET'S PLAY AGAIN...\n`);
                break;
            }

            // Output distance in stars
            var dist = Math.abs(guess - randomNum);
            if(isNaN(dist)) print("*");
            else if(dist >= 64) print("*");
            else if(dist >= 32) print("**");
            else if(dist >= 16) print("***");
            else if(dist >= 8) print("****");
            else if(dist >= 4) print("*****");
            else if(dist >= 2) print("******");
            else print("*******")
            print("\n\n")
        }

        if(loss) {
            print(`SORRY, THAT'S ${guesses} GUESSES. THE NUMBER WAS ${randomNum}\n`);
        }
    }
}

main();