object index problem

Hi all,

I have encountered a strange problem regarding indices. I have a small snippet of example code that shows this problem:

var a = {};
var c = {};

var b = "0";

a[b] = "hello world";
c["0"] = "hello moon";

console.log(a[b],a[0],a["0"]);
// output: hello world undefined undefined

console.log(c[b],c[0],c["0"]);
// output: undefined hello moon hello moon

function foo(id) {
 console.log(id,a[id], c[id]);
}

foo(b);
// output: 0 hello world undefined

foo("0");
// output: 0 hello world undefined

I would expect that a[b] and a["0"] would give the same result?

Thanks for all the help so far!