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Reference · stzList

Contains()

TRUE if the list contains the given item.

also: includes has is in member of present holds

Basic examples (2)

Softanza
o1 = new stzList("a":"t")
? o1.Contains("x")
Output
0

run on 2026-10-02 04:23 inside the library at commit 0e72e2e2c; taken from 649_contains.ring(opens in a new tab)

Softanza
? StzListQ(aOrders).Contains("soup")
? Q("cold").IsLowercase()
Output
1
1

run on 2026-10-02 04:24 inside the library at commit 0e72e2e2c; taken from 06-walk-ask-produce-act.en.md(opens in a new tab)

Scope (7)

Softanza
o1 = new stzList([ "a", "ab", "abnA", "abAb" ])
? o1.Contains("n")
? o1.FindFirst("n")
Output
0
0

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 264_contains.ring(opens in a new tab)

Softanza
o1 = new stzList([ 1:3, 4:6, 1:3, 1:3, 4:6, 7:10 ])
? o1.FindAll(1:3)
? o1.Contains(7:10)
Output
1
3
4

1

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 380_findall.ring(opens in a new tab)

Softanza
oL = new stzList([ "tea", "rice", "tea", "fish" ])
? oL.Contains("tea")
? oL.NumberOfOccurrence("tea")
? @@( oL.FindAll("tea") )
Output
1
2
[ 1, 3 ]

run on 2026-10-02 04:24 inside the library at commit 0e72e2e2c; taken from 05-one-object-any-structure.en.md(opens in a new tab)

Softanza
o1 = new stzList([ "a", "b", "C", 5, "d", "E" ])
? o1.ContainsW("isString(This[@i]) and @IsUppercase(This[@i])")
? @@( o1.FindW("isString(This[@i]) and @IsUppercase(This[@i])") )
? @@( o1.ItemsW("isString(This[@i]) and @IsUppercase(This[@i])") )
Output
1
[ 3, 6 ]
[ "C", "E" ]

run on 2026-10-02 04:23 inside the library at commit 0e72e2e2c; taken from 610_checker.ring(opens in a new tab)

Softanza
o1 = new stzList([ "A", "B", 1, "C", 2, 3, "D", 4, 5 ])
? o1.Contains("a")
? o1.Contains("A")
? o1.ContainsNo("C")
? o1.ContainsNo("X")
Output
0
1
0
1

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 396_contains.ring(opens in a new tab)

Softanza
o1 = new stzList([ "a", "ab", 1:3, "abA", "abAb", 1:3 ])
? o1.ContainsCS("ab", TRUE)
? o1.FindFirstCS("AB", FALSE)
? o1.FindLastCS("ABA", FALSE)
? o1.FindFirst(1:3)
? o1.FindLast(1:3)
Output
1
2
4
3
6

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 265_containscs.ring(opens in a new tab)

Softanza
o1 = new stzList([ "1", "1", [ "2", "♥", "2"], "1", [ "2", ["3", "🌞"] ] , "3" ])
? o1.FindFirst("3")
? o1.FindNth(3, "1")
? o1.Contains([ "2", "♥", "2"])
? o1.DeepContains("🌞")
? o1.DeepContainsMany([ "1", "♥", "3", "🌞" ]) # Or DeepContainsThese()
? o1.DeepContainsBoth("♥", :And = "🌞")
? o1.DeepContainsOneOfThese(["_", "🌞", "0" ])
? o1.DeepContainsNOfThese(2, ["_", "🌞", "0", "♥" ])
Output
6
4
1
1
1
1
1
1

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 326_findfirst.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
no
does what the method does, then returns the object, so the call can be chained
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 · ContainsCS, ContainsManyCS
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
yes
selects by a condition · ContainsW
WF
yes
selects by a condition, with the expressive keywords (@NextItem, @PreviousItem...) · ContainsWF
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
yes
works on a collection of items instead of one (the plural form) · ContainsMany, ContainsManyCS
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