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Reference · stzList

Count()

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

Basic examples (2)

Softanza
o = new stzList([ 4, 7, 10, 3, 8 ])
? @@( o.FindW("{ @item > 5 }") )
? @@( o.ItemsW("{ @item > 5 }") )
? o.CountW("{ @item > 5 }")
Output
[ 2, 3, 5 ]
[ 7, 10, 8 ]
3

run on 2026-10-02 04:24 inside the library at commit 0e72e2e2c; taken from 07-declare-what-not-how.en.md(opens in a new tab)

Softanza
cRule = "{ @item > 20 }"
oA = new stzList([ 12, 0, 30, -5, 18, 25 ])
oB = new stzList([ 3, 40, 9 ])
? oA.CountW(cRule)
? oB.CountW(cRule)
Output
2
1

run on 2026-10-02 04:24 inside the library at commit 0e72e2e2c; taken from 07-declare-what-not-how.en.md(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 · CountCS
ST
yes
takes the position to start from (StartingAt) · CountST
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 · CountW
WF
yes
selects by a condition, with the expressive keywords (@NextItem, @PreviousItem...) · CountWF
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