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// Test counters.
---
// Count with string key.
#let mine = counter("mine!")
Final: #locate(loc => mine.final(loc).at(0)) \
#mine.step()
First: #mine.display() \
#mine.update(7)
#mine.display("1 of 1", both: true) \
#mine.step()
#mine.step()
Second: #mine.display("I")
#mine.update(n => n * 2)
#mine.step()
---
// Count labels.
#let label = <heya>
#let count = counter(label).display()
#let elem(it) = [#box(it) #label]
#elem[hey, there!] #count \
#elem[more here!] #count
---
// Count headings.
#set heading(numbering: "1.a.")
#show heading: set text(10pt)
#counter(heading).step()
= Alpha
In #counter(heading).display()
== Beta
#set heading(numbering: none)
= Gamma
#heading(numbering: "I.")[Delta]
At Beta, it was #locate(loc => {
let it = query(heading, loc).find(it => it.body == [Beta])
numbering(it.numbering, ..counter(heading).at(it.location()))
})
---
// Count figures.
#figure(numbering: "A", caption: [Four 'A's], kind: image, supplement: "Figure")[_AAAA!_]
#figure(numbering: none, caption: [Four 'B's], kind: image, supplement: "Figure")[_BBBB!_]
#figure(caption: [Four 'C's], kind: image, supplement: "Figure")[_CCCC!_]
#counter(figure.where(kind: image)).update(n => n + 3)
#figure(caption: [Four 'D's], kind: image, supplement: "Figure")[_DDDD!_]
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