That is less powerful than the example I posted and gains you nothing. Three tested states are uninitialied, undefined and defined. My snippet replaces your defined() test with an exists() test which diferentiates between non-existant elements and merely undefined.

The "different" way I was thinking of would probably use something other than for() since for() also returns uninitialized elements. It's not sparse aware. You know - something like each() for arrays.

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