Any elegant way to sum up inside map function?

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2

Hello!
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For your problem, I wouldn’t actually have a “global variable” and add the total price of each line when constructing the rows. You can do it twice at nearly no cost, this would be more “elegant” than having a global variable.

To actually answer your question, you can create a state to keep track of the total price.

Here are the relevant lines below. I showcase two ways of computing the total price: sumtotalprice or totalprice-state.get().

#let totalprice-state = state("totalprice", 0.0)
#let totalprice(line) = {
  if line.type == lineTypes.special {
    return line.details.amount * line.details.pricePerUnit 
  }
  return 0
}
#let sumtotalprice(lines) = {
  if type(lines) == "array" {
    return lines.map(line => totalprice(line)).sum()
  }
}
// ...
          str(totalprice(line)) + totalprice-state.update(it => it + totalprice(line))
// ...
      [], [], [], "Total:", text(size: 15pt)[#sumtotalprice(lines) vs #context totalprice-state.get()]
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