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@ramji013 : It seems like something like (filter valid-object? object) if you just want the collection of invalid objects or something like (when (some invalid-object? objects) (throw code-to-create-exception-here)) if you want to fail on an invalid object would work if you have a simple predicate. From your comment I’m not sure why Clara would be helpful. Perhaps there is some other complication to your use-case though.