Get Programming with JavaScript - Listing 12.04

Get Programming with JavaScript - Listing 12.04

Listing 12.04 - Guess the random number

var getGuesser = function () {
    var secret = Math.floor(Math.random() * 10 + 1);

    return function (userNumber) {
        if (userNumber === secret) {
            return "Well done!";
        } else {
            return "Unlucky, try again.";
        }
    };
};

var guess = getGuesser();

Further Adventures

Listing 12.04 - Guess the random number - Task 3

Change the code so the secret number is between 30 and 50.

var getGuesser = function () {
    var secret = Math.floor(Math.random() * 21 + 30);

    return function (userNumber) {
        if (userNumber === secret) {
            return "Well done!";
        } else {
            return "Unlucky, try again.";
        }
    };
};

var guess = getGuesser();

Listing 12.04 - Guess the random number - Task 5

Create a function called 'between' that returns a random whole number between two numbers passed as arguments.

var between = function (num1, num2) {
    var lower = Math.min(num1, num2);
    var upper = Math.max(num1, num2);
    var range = upper - lower + 1;

    return Math.floor(Math.random() * range + lower);
};

between(8, 12) gives lower = 8, upper = 12, range = 5. Note there are 5 possible whole numbers between 8 and 12: 8, 9, 10, 11 and 12.