// Get Programming with JavaScript

// Listing 13.20

// The Place constructor as a module

​

(function () {

​

  var Place = function (title, description) {

    var newLine = spacer.newLine();

    var items = [];

    var exits = {};

    var getItemsInfo = function () {

        var itemsString = "Items: " + newLine;

        items.forEach(function (item) {

            itemsString += "   - " + item;

            itemsString += newLine;

        });

        return itemsString;

    };

    var getExitsInfo = function () {

        var exitsString = "Exits from " + title;

        exitsString += ":" + newLine;

        Object.keys(exits).forEach(function (key) {

            exitsString += "   - " + key;

            exitsString += newLine;

        });

        return exitsString;

    };

​

    var getTitleInfo = function () {

        return spacer.box(title, title.length + 4, "=");

    };

​

    var getInfo = function () {

        var infoString = getTitleInfo();

        infoString += description;

        infoString += newLine + newLine;

        infoString += getItemsInfo() + newLine;

        infoString += getExitsInfo();

        infoString += spacer.line(40, "=") + newLine;

        return infoString;

    };

​

    this.showInfo = function () {

        console.log(getInfo());

    };

​

    this.addItem = function (item) {

        items.push(item);

    };

    this.addExit = function (direction, exit) {

        exits[direction] = exit;

    };

​

    this.getExit = function (direction) {

        return exits[direction];

    };

    this.getLastItem = function () {

        return items.pop();

    };

  };

  if (window.theCrypt === undefined) {

    window.theCrypt = {};

  }

  theCrypt.Place = Place;  

})();

​

​

​

/* Further Adventures

 *

 * Have a play with the global object

 * at the console prompt:

 *

 * 1) Try to access a non-existent variable:

 *

 *    > spoon

 *

 *    ERROR! There is no spoon!

 *

 * 2) Access the global window object:

 *

 *    > window

 *

 *    Wow! It has lots of properties!

 *

 * 3) Try and access a non-existent property:

 *

 *    > window.spoon

 *

 *    This time, there is no error.

 *    No spoon property has been defined, so

 *    the special undefined value is returned.

 *

 * 4) Set a value for the spoon property:

 *

 *    > window.spoon = 1

 *

 *    Setting a property on the window object

 *    makes it available as a global variable.

 *

 * 5) Try to access the spoon variable:

 *

 *    > spoon

 *      1

 *

 */