<div>
Does the command .isNullo exist? I knew .isNull instead...and .IsNullOrEmpty
</div>


<div>
<div class="content wysiwyg-content">
Please checkout this JS Bin<br />
<a href="http://jsbin.com/iqikuf/3/edit" rel="ugc">http://jsbin.com/iqikuf/3/edit</a><br />
<br />
<br />
When the below is run in the console, the result shown makes sense to me.<br />
statement: vd.tools.push(dataItem);<br />
resuelt: 2<br />
<br />
But why do we get the below results when run in the console?<br />
statement: vd.tools.length<br />
result: 0
</div>
</div>


Please checkout this JS Bin
http://jsbin.com/iqikuf/3/edit


When the below is run in the console, the result shown makes sense to me.
statement: vd.tools.push(dataItem);
resuelt: 2

But why do we get the below results when run in the console?
statement: vd.tools.length
result: 0

KnockoutJS Array

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.