Wolfram Language & System 10.3 (2015)|Legacy Documentation
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generates an association in which only elements whose keys appear in but not in any of the are retained.
- KeyComplement preserves the order of the elements in .
- KeyComplement can be used not only on Association objects, but also on lists of rules.
- KeyComplement[assocall,assoc1,…,SameTest->test] applies test to each pair of keys of the elements in and the to determine whether they should be considered the same.
Introduced in 2015