Question

I’m using the Yahoo User Interface API. If I have the following:

var field = yuiDom.get('dobfield');

Is it necessary to check for something like:

if (field == null)

I’m a .NET developer, and whenever I try to get a reference to a control on my web page then I always check for null values. I checked the YUI examples, and references to controls are used extensively, but no where do I see if they check to see if there was a reference.

Answer 1

You might see this:

if(field)

or

if(!field)

Essentially these mean if is null, and if is not null. However, they are equivalent to

if (field == null)

and

if (field != null)