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Reference · stzList

FindFirst()

Same as FindFirstOccurrenceCS: FindFirstOccurrenceCS / FindLastOccurrenceCS The position of the FIRST occurrence of the item (0 if none).

Basic examples (2)

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, 2, 3, "*", 5, 6, "*", 8, 9 ])
# findfirst example 1
? @@( o1.FindFirst("*") )
Output
4

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 172_findfirst.ring(opens in a new tab)

Scope (8)

Softanza
o1 = new stzList([ [1,2], [3, [1], 4], [5,6], [ 2, 10 ], [3,4], [3, [1], 4] ])
? o1.FindAll( [3, [1], 4] )
? o1.FindFirst( [3, [1], 4] )
Output
2
6

2

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 377_findall.ring(opens in a new tab)

Softanza
o1 = new stzList([ 1, 2, "A":"C", 4, 5, "A":"C", 7, "A":"C"])
? o1.FindFirst("A":"C")
? o1.FindNth(2,"A":"C")
? o1.FindLast("A":"C")
Output
3
6
8

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 292_findfirst.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, 2, 3, "*", 5, 6, "*", 8 ])
# howmany example 1
? @@( o1.HowMany("*") )
# howmany example 2
? @@( o1.FindFirst("*") )
# howmany example 3
? @@( o1.FindLast("*") )
Output
2
4
7

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 211_howmany.ring(opens in a new tab)

Softanza
o1 = new stzList([ 14, 10, 14, 14, 20 ])
# findnext example 1
? @@( o1.FindNext(14, :StartingAt = 1) )
# findnext example 2
? @@( o1.Find(14) )
# findnext example 3
? @@( o1.FindFirst(4) )
Output
3
[ 1, 3, 4 ]
0

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 185_findnext.ring(opens in a new tab)

Softanza
o1 = new stzList([ "_", "_", "♥", "_", "_", "♥", "_" ])
? o1.FindFirst("♥")
? o1.FindLast("♥")
? o1.FindNext("♥", :StartingAt = 3)
? o1.FindPrevious("♥", :StartingAt = 6)
? o1.FindNthNext(1, "♥", :StartingAt = 6)
? o1.FindNthNext(1, "♥", :StartingAt = 5)
? o1.FindNthPrevious(2, "♥", :StartingAt = 7)
Output
3
6
6
3
0
6
3

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 282_findfirst.ring(opens in a new tab)

Softanza
o1 = new stzList([ 14, 10, 14, 14, 20 ])
# find example 1
? @@( o1.Find(14) )
# find example 2
? @@( o1.FindFirst(14) )
# find example 3
? @@( o1.FindLast(14) )
# find example 4
? @@( o1.FindNext(14, :StartingAt = 2) )
Output
[ 1, 3, 4 ]
1
4
3

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 177_find.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)

and 1 more in the tests

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 · FindFirstCS
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