Wolfram Language & System 11.0 (2016)|Legacy Documentation

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KeyComplement

KeyComplement[{assocall,assoc1,assoc2,}]
generates an association in which only elements whose keys appear in assocall but not in any of the associ are retained.

Details and OptionsDetails and Options

  • KeyComplement preserves the order of the elements in assocall.
  • 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 assocall and the associ to determine whether they should be considered the same.

ExamplesExamplesopen allclose all

Basic Examples  (1)Basic Examples  (1)

Find a key that is not present elsewhere:

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Introduced in 2015
(10.1)