actionscript (flex): how to know whether a property of object exists (or defined)?

Question

I am a Java developer who tries Flex. Here is my problem:

I behave actionScript objects as hashmap but when the object do not have the property it gives exception: No su

Answer 1

try

if ( obj["2008-02"] != null ) { then do something }

it is null, but you can't output null. you can also try converting it to a string for the purposes of a trace().