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POGrasping "OOP" JavaScript: module pattern with inheritance
 

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  1. POGrasping "OOP" JavaScript: module pattern with inheritance
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    <p>I'm trying to grasp the module pattern with added inheritance. I come from a university background, with mostly Java in my trunk, but I have been working with web techniques for about ten years. I'm only about a year into JavaScript though...</p> <p>Anyway, I'm trying a simple inheritance (<code>.prototype</code>) example. From a <code>People</code> object, you can add <code>Gentleman</code>'s and then list them using their <code>.toString()</code> method. A <code>Gentleman</code> is a child to a <code>Human</code>. It went good until I implemented the "abstract" <code>Human</code>, but now the code will not run.</p> <p>Please, comment on what is considered bad with my code. I would like to stay with the module/prototype approach though, but what am I doing wrong? I would also listen to what <code>this</code> means in different contexts. I.e., in <code>People</code> I can use the private <code>_people</code> directly, but in submodules I have to use <code>this._name</code>--why?</p> <pre><code>var People = People || {}; People = (function() { var People = function(){ this._people = []; }; var addGentleman = function (name) { this._people.push(new People.Gentleman(name)); }; var getList = function () { var temp = []; for (var i = 0; i &lt; this._people.length; i++) { temp.push(this._people[i].toString()); } return temp; }; People.prototype.constructor = People; People.prototype.addGentleman = addGentleman; People.prototype.getList = getList; return People; })(); People.Human = (function () { var Human = function (name, hasLadyParts) { this._name = name; this._hasLadyParts = hasLadyParts; }; var hasLadyParts = function () { return this._hasLadyParts; }; var toString = function () { var str = this._name; if (!this._hasLadyParts) str += ' no'; return str + ' lady parts.'; }; Human.prototype.constructor = Human; Human.prototype.hasLadyParts = hasLadyParts; Human.prototype.toString = toString; return Human; })(); People.Gentleman = (function () { var Gentleman = function (name) { People.Human.call(this, name, false); } var toString = function () { return 'Mr.' + People.Human.toString(); }; // Gentleman.prototype = Object.create(People.Human.prototype); Gentleman.prototype.constructor = Gentleman; Gentleman.prototype.toString = toString; return Gentleman; })(); $(function () { var people = new People(); people.addGentleman('Viktor'); people.addGentleman('Joakim'); var list = people.getList(); var $ul = $('#people'); for (var i = 0; i &lt; list.length; i++) { $ul.append('&lt;li&gt;' + list[i] + '&lt;/li&gt;'); } }); </code></pre> <p>Fiddle: <a href="http://jsfiddle.net/5CmMd/5/" rel="nofollow">http://jsfiddle.net/5CmMd/5/</a></p> <p><strong>Edit:</strong> I've updated code and fiddle a bit. If I get this working, I think I understand most of the design. This example would also work as a simple tutorial for future OOP programmers visiting JavaScript land, I think.</p>
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    1. USViktor
    1. USViktor
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      1. USJoseph at SwiftOtter
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    1. COCan you give a link to a description of the pattern? I can see a number of things that arent going to work but Id rather phrase it in terms of the pattern youre working to.
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      1. POGrasping "OOP" JavaScript: module pattern with inheritance
      1. USTom Elmore
    2. COThis pattern is not really described very good. I'm trying to combine what feels right to me together with what is considered acceptable in JS discussions. One very quick attempt at this pattern: http://stackoverflow.com/questions/8683125/combining-inheritance-with-the-module-pattern But hell, feel free to change what you want, and I can read most explanations if they're well defined. :)
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      1. USViktor
 

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