What is significance of javascript _property
<p>I look into the jQuery source v.1.8.1 and search the jQuery.fx.speeds and its value is </p>

<pre><code>jQuery.fx.speeds = {
slow: 600,
fast: 200,
// Default speed
_default: 400    };
</code></pre>

<p>Why did the jQuery developers use "_defaults" instead of "defaults"??</p>

<pre><code>jQuery.fx.speeds = {
slow: 600,
fast: 200,
// Default speed
// Default without underscore prefix in it 
default: 400    };
</code></pre>

<p>What is the benefits having a property with a prefixed underscore??
What the heck does the underscore stands for??</p>

<p>Example ..</p>

<pre><code> var obj = {};  
obj.property = "property value";
obj._property = "property value with _";

alert( obj._property );
alert( obj.property );
</code></pre>

<p>When does the obj._property is more appropriate use than obj.property??</p>

<p>Thanks...</p>
