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Reference · stzList

DuplicatesRemoved()

Immutable / past-tense aliases for the dedup operation. DuplicatesRemoved() returns the deduped list value without mutating This (equivalent to WithoutDuplication, ported from archive line 41406). Used by stzHashList.UniqueValues(). (case-sensitive by default)

also written: ToSet · ToSetOfItems

Basic examples (2)

Softanza
? @@( StzListQ([ "tea", "rice", "tea" ]).DuplicatesRemoved() )
Output
[ "tea", "rice" ]

run on 2026-10-02 04:24 inside the library at commit 0e72e2e2c; taken from 01-find-then-apply.en.md(opens in a new tab)

Softanza
o1 = new stzList([ 4, 1, 2, 1, 1, 2, 3, 3, 3 ])
? o1.DuplicatesRemoved()
Output
4
1
2
3

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 379_duplicatesremoved.ring(opens in a new tab)

Scope (3)

Softanza
o1 = new stzList([ "a", "ab", "b", 1:3, "a", "ab", "abc", "b", "bc", 1:3, "c" ])
? @@( o1.ToSet() )
Output
[ "a", "ab", "b", [ 1, 2, 3 ], "abc", "bc", "c" ]

run on 2026-10-02 04:23 inside the library at commit 0e72e2e2c; taken from 36_toset.ring(opens in a new tab)

Softanza
o1 = new stzList([ "teeba", "hussein", "haneen" , "hussein" ])
? o1.DuplicatesRemoved()
? o1.NumberOfItems()
Output
teeba
hussein
haneen

4

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 456_duplicatesremoved.ring(opens in a new tab)

Softanza
o1 = new stzList([ "tunis", 1:3, 1:3, "gafsa", "tunis", "tunis", 1:3, "gabes", "tunis", "regueb", "regueb" ])
o1.Reverse()
? @@( o1.Content() ) + NL
? o1.NumberOfDuplicates()
? o1.NumberOfDuplicatesOf("tunis") + NL	# Or NumberOfOccurrence("tunis")
? @@( o1.DuplicatedItems() ) + NL
? @@( o1.DuplicatesRemoved() )
Output
[ "regueb", "regueb", "tunis", "gabes", [ 1, 2, 3 ], "tunis", "tunis", "gafsa", [ 1, 2, 3 ], [ 1, 2, 3 ], "tunis" ]

6
4

[ "regueb", "tunis", [ 1, 2, 3 ] ]

[ "regueb", "tunis", "gabes", [ 1, 2, 3 ], "gafsa" ]

run on 2026-10-02 04:23 inside the library at commit 0e72e2e2c; taken from 588_reverse.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 · ToSetQ, ToSetOfItemsQ
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 · DuplicatesRemovedCS
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