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    <p>As @WaleedKhan points out, you shouldn't build a transcompiler for a language you don't know well.</p> <p>First off, your compiled code does not do what you think it does:</p> <pre><code>&gt; var test = { . // Objects != namespaces . // Anything that is not a key: value pair is a syntax error. . function Test() {} . } SyntaxError: Unexpected identifier </code></pre> <p>If you want a namespace-like effect you should use functions, since <a href="https://developer.mozilla.org/en-US/docs/JavaScript/Guide/Statements#Block_Statement" rel="nofollow noreferrer"><strong>JavaScript does not have block scope</strong></a>:</p> <pre><code>var test = (function(){ // This wrapper is an immediately invoked function expression (IIFE) // It will act as a "namespace" inasmuch as functions and variables that are // declared with `var` will not leak into the global scope. // However, anything that you don't *explicitly* expose will be private. function Foo() { this.bar = 0.0; } // JavaScript is case-sensative - foo != Foo. Foo.prototype.test = function() { var x = 1; }; return { Foo: Foo }; })(); </code></pre> <p>As to your questions:</p> <p>Yes, <code>Foo</code> is a constructor (of a sort) - however, JavaScript does not support the kind of dispatch you want to do. Instead, you'd need a wrapper function that calls the <em>appropriate</em> constructor depending on the arguments passed in:</p> <pre><code>function FooFactory() { if (typeof arguments[0] === "string") { return new FooString(arguments[0]); } else { return new FooObject(arguments[0]); } } </code></pre> <p>That rapidly gets difficult to work with (though there are <a href="https://github.com/natefaubion/matches.js" rel="nofollow noreferrer">some libraries</a> that make it easier to do such dispatching).</p> <p>As for how to properly do prototype inheritence, have you seen @bobince's answer to <a href="https://stackoverflow.com/questions/1595611/how-to-properly-create-a-custom-object-in-javascript/1598077#1598077">How to &quot;properly&quot; create a custom object in JavaScript?</a></p> <p>Finally, you may want to take a look at <a href="https://stackoverflow.com/questions/111102/how-do-javascript-closures-work">How do JavaScript closures work?</a> as well as Kangax's <a href="http://kangax.github.com/nfe/" rel="nofollow noreferrer">excellent</a> <a href="http://perfectionkills.com/understanding-delete/" rel="nofollow noreferrer">articles</a> on <a href="http://perfectionkills.com/javascript-quiz/" rel="nofollow noreferrer">trickier parts</a> of the JavaScript language (his <a href="http://kangax.github.com/es5-compat-table/" rel="nofollow noreferrer">ES5 compatibility table</a> is not to be missed either).</p> <p>If you made it this far, good luck on your adventure!</p>
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