subtract/3

Availability::- use_module(library(lists)).(can be autoloaded)

[det]subtract(+Set, +Delete, -Result)

Delete all elements in Delete from Set. Deletion is based on unification using memberchk/2. The complexity is |Delete|*|Set|. A set is defined to be an unordered list without duplicates. Elements are considered duplicates if they can be unified.

See also: ord_subtract/3.