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Reference · stzList

RemoveDuplicates()

remove duplicates / unique (engine-backed)

also: unique distinct dedupe remove repeats deduplicate drop duplicates

Basic examples (2)

Softanza
o1 = new stzList([ 1:3, 4:6, 1:3, 1:3, 4:6, 7:10 ])
o1.Removeduplicates()
? @@( o1.Content() )
Output
[ [ 1, 2, 3 ], [ 4, 5, 6 ], [ 7, 8, 9, 10 ] ]

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 381_removeduplicates.ring(opens in a new tab)

Softanza
o1 = new stzList([ "A", "B", "2", "A", "A", "B", 2, 2, "." ])
o1.RemoveDuplicates()
# removeduplicates example 1
? @@( o1.Content() )
Output
[ "A", "B", "2", 2, "." ]

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 132_removeduplicates.ring(opens in a new tab)

Scope (2)

Softanza
o1 = new stzList([ 5, 7, 5, 5, 4, 7 ])
? o1.ContainsDuplicates()
? o1.HowManyDuplicates()
? @@( o1.FindDuplicates() )
? @@( o1.DuplicatesZ() ) # Or DuplicatesAndTheirPositions()
o1.RemoveDuplicates()
? @@( o1.Content() )
Output
1
3
[ 3, 4, 6 ]
[ [ 5, [ 3, 4 ] ], [ 7, [ 6 ] ] ]
[ 5, 7, 4 ]

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 243_containsduplicates.ring(opens in a new tab)

Softanza
o1 = new stzList([ "_", "ONE", "_", "_", "TWO", "_", "THREE", "*", "*" ])
? o1.ContainsDuplicates()
? @@( o1.FindDuplicates() )
? @@( o1.Duplicates() )
? @@( o1.DuplicatesZ() ) # Or DuplicatesAndTheirPositions()
o1.RemoveDuplicates()
? @@( o1.Content() )
Output
1
[ 3, 4, 6, 9 ]
[ "_", "*" ]
[ [ "_", [ 3, 4, 6 ] ], [ "*", [ 9 ] ] ]
[ "_", "ONE", "TWO", "THREE", "*" ]

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 234_containsduplicates.ring(opens in a new tab)

The extensions of this method

Each extension, and whether it exists for this method; an extension that exists combines with the others (FindSTCS).

Extension
Exists
What it adds · The names
Q
yes
does what the method does, then returns the object, so the call can be chained · RemoveDuplicatesQ, RemoveDuplicatesCSQ
QQ
no
chains on the next, more specific type of object (the Q ladder)
QQQ
no
chains on the most specific type of object (the Q ladder)
QRT
no
returns the result as an object of the requested type
CS
yes
takes a case-sensitivity flag · RemoveDuplicatesCS, RemoveDuplicatesCSQ
ST
no
takes the position to start from (StartingAt)
IB
no
takes bounds that are included (IncludingBounds)
XT
no
the extended form: more parameters than the base method
XTT
no
yet another extension: a further extended form, after XT
Z
no
includes the position in what it returns
ZZ
no
returns positions as sections, [start, end]
W
no
selects by a condition
WF
no
selects by a condition, with the expressive keywords (@NextItem, @PreviousItem...)
D
no
takes a direction, forward or backward (Directional)
F
no
takes a function (the condition or the update is given as a function); the forms document also uses F for the future form, which defers the action
Many
no
works on a collection of items instead of one (the plural form)
Except
no
takes exceptions, what to leave out (the exceptional form)
U
no
returns the result without duplication

Every example is a test file of the library, run inside the library for this page; only those whose output kept every promise their file wrote are shown.

See also