Get Programming with JavaScript - Listings 10.12 and 10.13

Listings 10.12 and 10.13 - A Place constructor function

// The spacer namespace var spacer = { blank: function () { return ""; }, newLine: function () { return "\n"; }, line: function (length, character) { var longString = "****************************************"; longString += "----------------------------------------"; longString += "========================================"; longString += "++++++++++++++++++++++++++++++++++++++++"; longString += " "; length = Math.max(0, length); length = Math.min(40, length); return longString.substr(longString.indexOf(character), length); }, wrap : function (text, length, character) { var padLength = length - text.length - 3; var wrapText = character + " " + text; wrapText += spacer.line(padLength, " "); wrapText += character; return wrapText; }, box: function (text, length, character) { var boxText = spacer.newLine(); boxText += spacer.line(length, character) + spacer.newLine(); boxText += spacer.wrap(text, length, character) + spacer.newLine(); boxText += spacer.line(length, character) + spacer.newLine(); return boxText; } }; // The Place constructor var Place = function (title, description) { var newLine = spacer.newLine(); this.title = title; this.description = description; this.items = []; this.exits = {}; this.getItemsInfo = function () { var itemsString = "Items: " + newLine; this.items.forEach(function (item) { itemsString += " - " + item; itemsString += newLine; }); return itemsString; }; this.getExitsInfo = function () { var exitsString = "Exits from " + this.title; exitsString += ":" + newLine; Object.keys(this.exits).forEach(function (key) { exitsString += " - " + key; exitsString += newLine; }); return exitsString; }; this.getTitleInfo = function () { return spacer.box( this.title, this.title.length + 4, "=" ); }; this.getInfo = function () { var infoString = this.getTitleInfo(); infoString += this.description; infoString += newLine + newLine; infoString += this.getItemsInfo() + newLine; infoString += this.getExitsInfo(); infoString += spacer.line(40, "=") + newLine; return infoString; }; this.showInfo = function () { console.log(this.getInfo()); }; this.addItem = function (item) { this.items.push(item); }; this.addExit = function (direction, exit) { this.exits[direction] = exit; }; }; // Map var kitchen = new Place( "The Kitchen", "You are in a kitchen. There is a disturbing smell." ); var library = new Place( "The Old Library", "You are in a library. Dusty books line the walls." ); var garden = new Place( "The Kitchen Garden", "You are in a small, walled garden." ); var cupboard = new Place( "The Kitchen Cupboard", "You are in a cupboard. It's surprisingly roomy." ); kitchen.addItem("a piece of cheese"); library.addItem("a rusty key"); cupboard.addItem("a tin of spam"); kitchen.addExit("south", library); kitchen.addExit("west", garden); kitchen.addExit("east", cupboard); library.addExit("north", kitchen); garden.addExit("east", kitchen); cupboard.addExit("west", kitchen); // Test kitchen.showInfo();

Further Adventures

Listings 10.12 and 10.13 - A Place constructor function - Tasks 1 & 2

var places = [ kitchen, library, cupboard, garden ]; places.forEach(function (place) { place.showInfo(); });