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Reference · stzList

ReplaceAt()

Positional replace: swap whatever lives at position n with pNewItem. Mirrors AddItemAt / InsertAt / RemoveAt naming.

Basic examples (2)

Softanza
o1 = new stzList([ "A", "a", "A" ])
o1.ReplaceAt(2, :By = "A")
? o1.Content()
Output
A
A
A

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 528_replaceat.ring(opens in a new tab)

Softanza
o1 = new stzList([ "♥", 2, "♥", "♥", 5 ])
o1.ReplaceAt(2, "♥")
? @@( o1.Content() )
Output
[ "♥", "♥", "♥", "♥", 5 ]

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 531_replaceat.ring(opens in a new tab)

Scope (3)

Softanza
o1 = new stzList([ "♥", 2, "♥", "♥", 5 ])
o1.ReplaceAt([2, 5], "♥")	# Or ReplaceAnyAt()
? @@( o1.Content() )
o1.ReplaceThisAt(3, "♥", 3)
? @@( o1.Content() )
Output
[ "♥", "♥", "♥", "♥", "♥" ]
[ "♥", "♥", 3, "♥", "♥" ]

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 532_replaceat.ring(opens in a new tab)

Softanza
o1 = new stzList([ "A", "b", "C" ])
o1.ReplaceAt(2, "B")
? o1.Content()
o1 = new stzList([ "A", "b", "C" ])
o1.ReplaceAt(2, :With = "B")
? o1.Content()
Output
A
B
C

A
B
C

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 527_replaceat.ring(opens in a new tab)

Softanza
o1 = new stzList([ "1", "2", "*", "4", "5" ])
o1.ReplaceAt(3, :By = "3")
? @@( o1.Content() )
o1 = new stzList([ "1", "_", "3", "_", "_" ])
o1.ReplaceNextNthOccurrenceST( 2, :Of = "_", :With = "5", :StartingAt = 3)
? @@( o1.Content() )
Output
[ "1", "2", "3", "4", "5" ]
[ "1", "_", "3", "_", "5" ]

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 442_replaceat.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
yes
does what the method does, then returns the object, so the call can be chained · ReplaceAtQ
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