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ccapndave/gist:2585349

Created May 3, 2012 12:32
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gistfile1.txt
existingRecords = [ { _id: 1 }, { _id: 2 } ]
requiredRecords = [ { _id: 2 }, { _id: 3 } ]
# I want to find out all the elements of requiredRecords that aren't in existingRecords (there will actually be other properties apart from _id, but I test equality on _id).
=> [ { _id: 3 } ]
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