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The table summarizes the set membership operators available in APL. These operators filter records based on whether a value matches any element in a specified set.
NameDescriptionCase-sensitive
inReturns true if the value equals any of the elements.Yes
!inReturns true if the value doesn’t equal any of the elements.Yes
in~Returns true if the value equals any of the elements.No
!in~Returns true if the value doesn’t equal any of the elements.No