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Backwards Compatibility:
Fully Compatible
Operating System:
ALL
Steps To Reproduce:
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db.collection.drop(); db.collection.insert({_id: 1, foo: 'bar'}); db.collection.find({ _id: 1, foo: 'bar', $where: function() { print('$where run with: ' + tojson(obj)); return true; } });

This logs:

2013-11-20T18:02:41.551-0500 [conn9] $where run with: { "_id" : 1, "foo" : "bar" } 2013-11-20T18:02:41.553-0500 [conn9] $where run with: { "_id" : 1, "foo" : "bar" }

If you remove the _id and foo filters from the query, then the JS function only runs once.
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db.collection.drop(); db.collection.insert({_id: 1, foo: 'bar' }); db.collection.find({ _id: 1, foo: 'bar' , $where: function() { print( '$where run with: ' + tojson(obj)); return true ; } }); This logs: 2013-11-20T18:02:41.551-0500 [conn9] $where run with: { "_id" : 1, "foo" : "bar" } 2013-11-20T18:02:41.553-0500 [conn9] $where run with: { "_id" : 1, "foo" : "bar" } If you remove the _id and foo filters from the query, then the JS function only runs once.

If a $where clause is combined with other filters in a query, the Javascript function in the $where clause is invoked twice.