Agree. Hopefully (?) it's just JS by the point we get to `Mail.outgoingMessages` so it should be fairly straightforward to mix-in underscore's methods into whatever their 'collection' representation is, the same way Backbone does [1] to give you map/filter/which etc.

[1] http://backbonejs.org/#Collection-Underscore-Methods

In fact, you can use either “whose” or “where”, and the AppleScript language guide refers to this as “Filter”:

<https://developer.apple.com/library/mac/documentation/apples...

I agree, but I guess .filter or .where could be more difficult to understand for beginners.