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Reference · stzString

ContainsAt()

ContainsAt(p1, p2): does the content contain p2 at position p1? Two shapes supported by narratives: ContainsAt(nPos, pcSub) ContainsAt(pcSub, :Position = nPos) ContainsAt(anPositions, pcSub) -- ContainsAtPositions

also written: ContainsAtPositions

Basic examples (2)

Softanza
# hearts sit at 2, 5, 8
? Q("^♥^^♥^^♥^").ContainsAtPositions([ 2, 5, 8 ], "♥")
# a heart sits at position 1
? Q("♥^^♥^^♥").ContainsAtPosition("♥", 1)
Output
1
1

run on 2026-10-02 04:23 inside the library at commit 0e72e2e2c; taken from 177_containsatpositions.ring(opens in a new tab)

Softanza
# ContainsAt([1,4,7], '♥') is TRUE
? Q("♥^^♥^^♥").ContainsAt([ 1, 4, 7 ], "♥")
# ContainsXT('♥', :AtPositions=[1,4,7]) is TRUE
? Q("♥^^♥^^♥").ContainsXT("♥", :AtPositions = [ 1, 4, 7 ])
Output
1
1

run on 2026-10-02 04:23 inside the library at commit 0e72e2e2c; taken from 178_containsat.ring(opens in a new tab)

Scope (1)

Softanza
# ContainsAt(3, '♥') is TRUE
? Q("^^♥^^").ContainsAt(3, "♥")
# ContainsAt('♥', :Position=3) is TRUE
? Q("^^♥^^").ContainsAt("♥", :Position = 3)
# ContainsXT('♥', :AtPosition=3) is TRUE
? Q("^^♥^^").ContainsXT("♥", :AtPosition = 3)
Output
1
1
1

run on 2026-10-02 04:23 inside the library at commit 0e72e2e2c; taken from 170_containsat.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
no
takes a case-sensitivity flag
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