Listing 11.16 - Hiding place info in the constructor
JS Bin
// 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();
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();
};
};
Listing 11.16 - Hiding place info in the constructor - Tasks 1 & 2
- Add a method that lets users remove an item using its name.
- Add a method that lets users remove an item using its index.
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();
};
this.removeItem = function (item) {
var index = this.items.indexOf(item);
this.items.splice(index, 1);
};
this.removeItemAt = function (index) {
this.items.splice(index, 1);
};
};
