Get Programming with JavaScript

Get Programming with JavaScript - Listing 7.11

Listing 7.11 - Displaying player information using objects

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;
    }
};

var getPlayerName = function (player) {
    return player.name;
};

var getPlayerHealth = function (player) {
    return player.name + " has health " + player.health;
};

var getPlayerPlace = function (player) {
    return player.name + " is in " + player.place;
};

var getPlayerInfo = function (player, character) {
    var place = getPlayerPlace(player);
    var health = getPlayerHealth(player);
    var longest = Math.max(place.length, health.length) + 4;

    var info = spacer.box(getPlayerName(player), longest, character);
    info += spacer.wrap(place, longest, character);
    info += spacer.newLine() + spacer.wrap(health, longest, character);
    info += spacer.newLine() + spacer.line(longest, character);
    info += spacer.newLine();

    return info;
};

var player1 = {
    name: "Kandra",
    place: "The Dungeon of Doom",
    health: 50
};

var player2 = {
    name: "Dax",
    place: "Limbo",
    health: 40
};

console.log(getPlayerInfo(player1, "="));
console.log(getPlayerInfo(player2, "+"));

Further Adventures

Listing 7.11 - Displaying player information using objects - Task 1

Add an items property to each player.

var player1 = {
    name: "Kandra",
    place: "The Dungeon of Doom",
    health: 50,
    items: "a rusty key, The Sword of Doom"
};

var player2 = {
    name: "Dax",
    place: "Limbo",
    health: 40,
    items: "a smelly cheese"
};

Listing 7.11 - Displaying player information using objects - Task 2

Write a getPlayerItems function to return a string for a player's items.

var getPlayerItems = function (player) {
    return "Items for " + player.name + ": " + player.items;
};

Listing 7.11 - Displaying player information using objects - Task 3

Update the getPlayerInfo function so it also includes the items info. Take the items info string into account when working out the longest string.

var getPlayerInfo = function (player, character) {
    var place = getPlayerPlace(player);
    var health = getPlayerHealth(player);
    var items = getPlayerItems(player);

    var longest = Math.max(items.length, Math.max(place.length, health.length)) + 4;

    var info = spacer.box(getPlayerName(player), longest, character);
    info += spacer.wrap(place, longest, character);
    info += spacer.newLine() + spacer.wrap(health, longest, character);
    info += spacer.newLine() + spacer.wrap(items, longest, character);
    info += spacer.newLine() + spacer.line(longest, character);
    info += spacer.newLine();

    return info;
};