Object keys are always strings (or converted to string) you can reference
it with dot or with square brakets and string...
foo.bar
does the same than
foo["bar"]
always, but you can do also
var thekey = "key";
foo[thekey]...
Some useful methods:
thekey in foo // will return true if foo has a property named thekey
Object.keys(foo) // returns an array of string with all enumerable
properties
El miércoles, 12 de diciembre de 2012, spqr escribió:
>
> Thanks for your help on this, I think you solved my problem with "this" by
> helping me avoid eval().
> Coming at JavaScript with some history in lisp, maybe my question should
> have been "why does JavaScript have eval()?" ;-)
> (Hah! I know it still has its uses...)
>
> I just constructed this code:
>
> var myobjs = { p1234: { a: 1,
> b: function() { var c = this.a; return 0; }},
> p2345: { a: 2,
> b: function() { var c = this.a; return 1; }}};
>
> var q = "p1234";
> myobjs[q].b();
>
> I ran a quick test and it works like a charm. I noticed that the object
> keys can be
> literals or strings and it still works. Is there any preference on which
> to use?
>
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