"each" is for Enumerables like Arrays, you are returning an object.
http://www.prototypejs.org/api/enumerable/each

So if you want to iterate over a list of Object properties you can use
a "for in loop" or
Object.keys(data).each(...
or
Object.values(data).each(...

or
$H(data) and perform other operations:
http://www.prototypejs.org/api/hash

- JDD
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