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Reference · stzList

FindItems()

[[item, [positions...]], ...] in first-appearance order

also written: Index · ItemsAndTheirPositions

Basic examples (2)

Softanza
o1 = new stzList([ "A", "B", "A", "C", "D", "B" ])
? @@( o1.Index() )
Output
[ [ "A", [ 1, 3 ] ], [ "B", [ 2, 6 ] ], [ "C", [ 4 ] ], [ "D", [ 5 ] ] ]

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

Softanza
o1 = new stzList([ "A", "B", "A", "C", "D", "B", "b" ])
? @@( o1.IndexCS(FALSE) )
Output
[ [ "a", [ 1, 3 ] ], [ "b", [ 2, 6, 7 ] ], [ "c", [ 4 ] ], [ "d", [ 5 ] ] ]

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 23_indexcs.ring(opens in a new tab)

Scope (4)

Softanza
	o1 = new stzList([ "A", "B", "A", "C", "C", "D", "A", "E" ])
	? @@NL( o1.Index() ) # Or FindItems() or ItemsZ() or ItemsAndTheirPositions()
Output
[
	[
		"A",
		[ 1, 3, 7 ]
	],
	[
		"B",
		[ 2 ]
	],
	[
		"C",
		[ 4, 5 ]
	],
	[
		"D",
		[ 6 ]
	],
	[
		"E",
		[ 8 ]
	]
]

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 329_index.ring(opens in a new tab)

Softanza
o1 = new stzList([ "A", "m", "n", "B", "A", "x", "C", "z", "B" ])
? o1.ItemsPositionsWF( func x { return Q(x).IsUppercase() } ) # Say also o1.FindItemsW(...) or .FindW(...)
? @@( o1.ItemsAndTheirPositionsWF( func x { return Q(x).IsUppercase() } ) )
Output
1
4
5
7
9

[ [ "A", [ 1, 5 ] ], [ "B", [ 4, 9 ] ], [ "C", [ 7 ] ] ]

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 478_itemspositionswxt.ring(opens in a new tab)

Softanza
o1 = new stzList([ "1", "A", "B", "A", "A", "C", "B", 1 ])
? @@( o1.Withoutduplication() ) + NL
? @@( o1.FindItems() ) + NL # Or ItemsZ()
? @@( o1.ItemsCount() )
Output
[ "1", "A", "B", "C", 1 ]

[ [ "1", [ 1 ] ], [ "A", [ 2, 4, 5 ] ], [ "B", [ 3, 7 ] ], [ "C", [ 6 ] ], [ 1, [ 8 ] ] ]

[ [ "1", 1 ], [ "A", 3 ], [ "B", 2 ], [ "C", 1 ], [ 1, 1 ] ]

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 20_withoutduplication.ring(opens in a new tab)

Softanza
o1 = new stzList([ 2, 8, 2, 11, 2, 11, 1, 4, 2, 1, 3, 2, 10, 8, 3, 8 ])
? o1.FindWF( func x { return Q(x).IsOneOfThese([ 2, 4, 6]) } )
? o1.ItemsWF( func x { return Q(x).IsOneOfThese([ 2, 4, 6]) } )
? o1.UniqueItemsWF( func x { return Q(x).IsOneOfThese([ 2, 4, 6]) } )
? @@NL( o1.ItemsAndTheirPositionsWF( func x { return Q(x).IsOneOfThese([ 2, 4, 6]) } ) )
Output
1
3
5
8
9
12

2
2
2
4
2
2

2
4

[
	[
		2,
		[
			1,
			3,
			5,
			9,
			12
		]
	],
	[
		4,
		[ 8 ]
	]
]

run on 2026-10-02 04:22 inside the library at commit 0e72e2e2c; taken from 475_findwxt.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 · IndexCS, FindItemsCS
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
yes
selects by a condition · FindItemsW, ItemsAndTheirPositionsW
WF
yes
selects by a condition, with the expressive keywords (@NextItem, @PreviousItem...) · ItemsAndTheirPositionsWF
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