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Reference · stzList

NumberOfOccurrence()

Same as NumberOfOccurrenceCS: NumberOfOccurrenceCS: count occurrences How many times the given item occurs in the list.

also written: HowMany · NumberOfDuplicatesOf

Basic examples (2)

Softanza
o1 = new stzList(1:14 + 12)
# numberofoccurrence example 1
? @@( o1.NumberOfOccurrence(12) )
Output
2

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 186_numberofoccurrence.ring(opens in a new tab)

Softanza
o1 = new stzList([ 122, 67, 120, 58, 101, 120 ])
? o1.FindAll(120)
? o1.NumberOfOccurrence(120)
Output
3
6

2

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 489_findall.ring(opens in a new tab)

Scope (6)

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(["__", "♥", "_", "__", "♥", "♥", "__", "♥" ])
? o1.NumberOfOccurrence("♥") #NOTE that this is a misspelled form (lacks an "r")
o1 = new stzList(["__", 1:3, "_", "__", 1:3, 1:3, "__", 1:3 ])
? o1.NumberOfOccurrence(1:3)
Output
4
4

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 295_numberofoccurrence.ring(opens in a new tab)

Softanza
o1 = new stzString("123456♥..♥♥")
# 3 hearts live at or after position 6
? o1.HowManyST("♥", :StartingAt = 6)
o2 = new stzList( @Chars("123456♥..♥♥") )
# the char-list counts the same
? o2.HowManyST("♥", :StartingAt = 6)
Output
3
3

run on 2026-10-02 04:24 inside the library at commit 0e72e2e2c; taken from 320_howmanyst.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([ "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)

Softanza
o1 = new stzList([
		"*", '"*"', "*4", "*4*", "*4*3", "*4*34",
		"4", "4*", "4*3", "4*34", "*", "*3",
		"*34", '"*"', "3", "34", "4", '"*"'
	])
# numberofoccurrence example 1
? @@( o1.NumberOfOccurrence('"*"') )
# numberofoccurrence example 2
? @@( o1.Find('"*"') )
Output
3
[ 2, 14, 18 ]

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 166_numberofoccurrence.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 · NumberOfOccurrenceCS
ST
yes
takes the position to start from (StartingAt) · HowManyST, NumberOfOccurrenceST
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 · NumberOfOccurrenceW
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