Codingdudes: actionscript

After checking on wonderlt.net and tracing through code in mx.rpc.xml we can find that

currentChild.appendChild(xmlSpecialCharsFilter(Object(value)));

which is same the same as:

currentChild.appendChild("null");

This code, according to my original fiddle, returns an empty XML element. But why?

reason is here

var thisIsNotNull:XML = <root>null</root>;
if(thisIsNotNull == null){
    // always branches here, as (thisIsNotNull == null) strangely

 returns true despite the fact that thisIsNotNull is a valid instance

 of type XML
}

When currentChild.appendChild is passed the string "null", it first

 converts it to a root XML element with text null, and then tests

that element against the null literal

we should always use  strict equality tests when checking XML for

checking nullness

Codingdudes