remove-duplicates!

Returns a sequence without duplicates, possibly modifying the sequence.

test is the function used to determine whether one element is a duplicate of another. The test argument may be non-commutative; it will always be called with its arguments in the same order as they appear in source-sequence.

The result-sequence may or may not be freshly allocated, may or may not share structure with the source-sequence, and may or may not be == to the source-sequence. The source-sequence may or may not be modified by the operation.

define variable *menu* = #("spam", "eggs", "spam",
                           "sausage", "spam", "spam")
remove-duplicates! (*menu*, test: \=)
  ⇒  #("spam", "eggs", "sausage")
or
 ⇒  #("eggs", "spam", "sausage")
or
 ⇒  #("eggs", "sausage", "spam")
*menu*
  ⇒  {undefined}

Exported from

Modifiers

open

Arguments

source-sequence	An instance of <sequence>.
test:	An instance of <function>. The default is ==.

Values

result-sequence

An instance of <sequence>.