Get Programming with JavaScript

Get Programming with JavaScript - Listing 12.06

Listing 12.06 - A neater else-if block

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

    return function (userNumber) {
        if (userNumber === secret) {
            return "Well done!";
        } else if (userNumber > secret) {
            return "Too high!";
        } else {
            return "Too low!";
        }
    };
};

var guess = getGuesser();

Further Adventures

Listing 12.06 - A neater else-if block - Tasks 1 to 3

Add a 'range' parameter to the function definition of getGuesser.
Change the 10 after Math.random() to 'range'.
Include an argument when getGuesser is called.

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

    return function (userNumber) {
        if (userNumber === secret) {
            return "Well done!";
        } else if (userNumber > secret) {
            return "Too high!";
        } else {
            return "Too low!";
        }
    };
};

var guess = getGuesser(20);

Listing 12.06 - A neater else-if block - Task 5

Now add a second parameter, 'offset' and update the code to choose random numbers greater than or equal to the value of offset.

var getGuesser = function (range, offset) {
    var secret = Math.floor(Math.random() * range + offset);

    return function (userNumber) {
        if (userNumber === secret) {
            return "Well done!";
        } else if (userNumber > secret) {
            return "Too high!";
        } else {
            return "Too low!";
        }
    };
};

// 20 possible numbers starting at 10.
// i.e. from 10 to 29 inclusive
var guess = getGuesser(20, 10);