Get Programming with JavaScript

Get Programming with JavaScript - Listing 10.10

Listing 10.10 - An exits object in the Place constructor

var Place = function (title, description) {
    this.title = title;
    this.exits = {};

    this.addExit = function (direction, exit) {
        this.exits[direction] = exit;
    };

    this.showExits = function () {
        console.log("Exits from " + this.title + ":");

        Object.keys(this.exits).forEach(function (key) {
            console.log(key);
        });
    };
};

var library = new Place("The Old Library");
var kitchen = new Place("The Kitchen");
var garden = new Place("The Kitchen Garden");

kitchen.addExit("south", library);
kitchen.addExit("west", garden);

kitchen.showExits();

Further Adventures

Listing 10.10 - An exits object in the Place constructor - Tasks 1 to 3

Add an exit from the library to the kitchen.
Add an exit from the garden to the kitchen.
Show the exits for the library and the garden.

var Place = function (title, description) {
    this.title = title;
    this.exits = {};

    this.addExit = function (direction, exit) {
        this.exits[direction] = exit;
    };

    this.showExits = function () {
        console.log("Exits from " + this.title + ":");

        Object.keys(this.exits).forEach(function (key) {
            console.log(key);
        });
    };
};

var library = new Place("The Old Library");
var kitchen = new Place("The Kitchen");
var garden = new Place("The Kitchen Garden");

kitchen.addExit("south", library);
kitchen.addExit("west", garden);
library.addExit("north", kitchen);
garden.addExit("east", kitchen);

kitchen.showExits();
library.showExits();
garden.showExits();

Listing 10.10 - An exits object in the Place constructor - Task 4

Add a couple more places and link them into the map.

var Place = function (title, description) {
    this.title = title;
    this.exits = {};

    this.addExit = function (direction, exit) {
        this.exits[direction] = exit;
    };

    this.showExits = function () {
        console.log("Exits from " + this.title + ":");

        Object.keys(this.exits).forEach(function (key) {
            console.log(key);
        });
    };
};

var library = new Place("The Old Library");
var kitchen = new Place("The Kitchen");
var garden = new Place("The Kitchen Garden");
var dungeon = new Place("The Dungeon");
var shed = new Place("The Garden Shed");

kitchen.addExit("south", library);
kitchen.addExit("west", garden);

library.addExit("north", kitchen);
library.addExit("down", dungeon);

garden.addExit("east", kitchen);
garden.addExit("north", shed);

dungeon.addExit("up", library);
shed.addExit("south", garden);

kitchen.showExits();
library.showExits();
garden.showExits();
dungeon.showExits();
shed.showExits();