Subj : Re: Spidermonkey JS question
To   : netscape.public.mozilla.jseng,comp.lang.javascript
From : =?ISO-8859-1?Q?Georg_Maa=DF?= <georg@bioshop.de>
Date : Wed Nov 05 2003 09:59 pm

I?igo Koch wrote:
> Hi,
> 
> I need to create an object that at the same time has a string value:
> 
> foo = "string1";
> foo.bar = "string2";
> 
> It must be possible since browsers have a lot of these cases:
> location = "str";
> location.href = "str"; 
> etc.. 

Only the first sample contains an implicite cast; the second does not. 
The second sample uses a setter as written by Brendan. The first sample 
first assigns a string value to the variable foo. foo now contains a 
string value, not an object. foo.bar = "string2"; now casts foo 
temporary to a String wrapper object. This is caused by the element 
lookup operator. The string value "string2" is assigned to the bar 
property of the temporary string object.

If you output foo you get "string1"; if you ouptut foo.bar, you get 
undefined or nothing.

alert(foo + '\n' + foo.bar);

this alerts:

string1
undefined


js> print(foo + '\n' + foo.bar);

this writes:

string1



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