Get Programming with JavaScript

Get Programming with JavaScript - Listing 8.13

Listing 8.13 - Displaying player items

// 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;
    }
};


// Player display code

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 getPlayerItems = function (player) {
    var itemsString = "Items:" + spacer.newLine();

    player.items.forEach(function (item) {
        itemsString += "   - " + item + spacer.newLine();
    });

    return itemsString;
};

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();
    info += "  " + getPlayerItems(player);
    info += spacer.newLine();
    info += spacer.line(longest, character);

    info += spacer.newLine();

    return info;
};

var showPlayerInfo = function (player, character) {
    console.log(getPlayerInfo(player, character));
};


// Create a player

var player1 = {
    name: "Kandra",
    place: "The Dungeon of Doom",
    health: 50,
    items : ["a trusty lamp"]
};

showPlayerInfo(player1, "=");

player1.items.push("a rusty key");

showPlayerInfo(player1, "*");

Further Adventures

Listing 8.13 - Displaying player items - Task 2

Use the index argument for forEach to number the items displayed. Make the numbers start at 1.

var getPlayerItems = function (player) {
    var itemsString = "Items:" + spacer.newLine();

    player.items.forEach(function (item, i) {
        itemsString += "(" + (i + 1) + ") " + item + spacer.newLine();
    });

    return itemsString;
};

Listing 8.13 - Displaying player items - Task 3

Write a showItem function that accepts a player and an itemNumber as arguments and displays the specified player item.

var showItem = function (player, itemNumber) {
    var info = "Item " + itemNumber;
    info += " for " + player.name;
    info += " is " + player.items[itemNumber];

    console.log(info);
};

Listing 8.13 - Displaying player items - Task 4

Write an addItem function that accepts a player and an item title as arguments and adds the item title to the player's item array.

var addItem = function (player, item) {
    player.items.push(item);
};