Subj : Rhino: !(java.lang.Boolean.FALSE) != !false
To   : netscape.public.mozilla.jseng
From : Attila Szegedi
Date : Thu Oct 28 2004 05:58 pm

Hi folks,

Here's a shell session I just run:

C:\projects\mozilla\mozilla\js\rhino\build\rhino1_6R1pre>java -jar js.jar
Rhino 1.6 release 1_pre_RC3 2004 10 27
js> java.lang.Boolean.FALSE == false
false
js>

Now, I understand that this slightly unintuitive result is due to the fact  
that the expresisons gets evaluated (if I interpreted correctly)
according to the point 19 of "The Abstract Equality Comparison Algorithm"  
(ECMA-262 section 11.9.3). However, I even attempted forcing the boolean
comparison, as hinted on page 56 of ECMA-262:

js> !java.lang.Boolean.FALSE == !false
false

then, thinking maybe associativity is the problem:

js> !(java.lang.Boolean.FALSE) == !false
false

Now, I'd expect at least this last expression to work, since  
NativeJavaObject.defaultValue(ScriptRuntime.BooleanClass) ought to  
correctly convert
it into a boolean. Am I overlooking something?

TIA,
    Attila.

.