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39.3.8 Deleting

The procedures for deleting elements from a list either accept a predicate or a comparison object for determining which elements are to be removed.

delete x lst [=]	Scheme Procedure
delete! x lst [=]	Scheme Procedure

Return a list containing all elements from lst, but without the elements equal to x. Equality is determined by the equality predicate =, which defaults to equal? if not given. delete! is allowed, but not required to modify the structure of the argument list in order to produce the result.

delete-duplicates lst [=]	Scheme Procedure
delete-duplicates! lst [=]	Scheme Procedure

Return a list containing all elements from lst, but without duplicate elements. Equality of elements is determined by the equality predicate =, which defaults to equal? if not given. delete-duplicates! is allowed, but not required to modify the structure of the argument list in order to produce the result.