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    <p><a href="http://es5.github.com/#x4.3.2" rel="nofollow">Primitives</a> are not objects, everything else (<a href="http://es5.github.com/#x15-toc" rel="nofollow">any standard object</a>) is an object. However, most primitives (all apart from <code>undefined</code> and <code>null</code>) have an object counterpart.</p> <p>So </p> <pre><code>var a = false; </code></pre> <p>is not an object, but</p> <pre><code>var b = new Boolean(false); </code></pre> <p>is.</p> <p>Since two objects are only equal if they refer to one and the same object, using the object version of primitives should better be avoided:</p> <pre><code>a === false; // is true b === false // is false &lt;- this is a problem </code></pre> <p>Or especially with boolean objects, using them with any boolean operators will create unexpected results. An object reference always evaluates to <code>true</code>, so the outcome of using <code>b</code> would be:</p> <pre><code>// remember // a is the primitive value false // b is a boolean object with value false // NOT !a // true // but !b // false // AND a &amp;&amp; true // false // but b &amp;&amp; true // true </code></pre> <p>There is no real advantage of using these object versions anyway, since JavaScript is <a href="http://en.wikipedia.org/wiki/Autoboxing#Autoboxing" rel="nofollow">autoboxing</a> primitives when you try to call methods on them. That's why calls like:</p> <pre><code>var s = "HI THERE!".toLowerCase(); s = s.substring(0,2); </code></pre> <p>are possible.</p>
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    1. POAre booleans objects in JavaScript?
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    1. USFelix Kling
    1. USFelix Kling
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    1. POAre booleans objects in JavaScript?
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    1. COHowever, you virtually never want object-wrapped primitives.
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    2. COthere is a purpose (although not very useful: http://stackoverflow.com/a/856330/908879) _"...is to convert non boolean objects into a boolean"_
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    3. CO@ajax333221: True, you could indeed use it for type conversion. In this case, you could also use double negation though, e.g. `!!"someString"`. Also it is important to note that there is a difference between calling `Boolean` (and any other of these functions) as function or as constructor. As function they all(?) return primitive values.
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