How can I format the last row of a table?

Questions
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5

If you put you cells in an array, you can automatically compute the number of rows according to the number of columns, like so:

#let n-cols = 3
#let cells = ([A], [B], [C], [D], [E], [F], [G])
#let n-rows = calc.ceil(cells.len() / n-cols)
#table(
  columns: n-cols,
  fill: (_, y) => if y == n-rows - 1 {
    gray.lighten(50%)
  } else {
    none
  },
  ..cells
)

If this is something you need in multiple places, you could even wrap it in a function, for example:

#let my-table(cells, ..args) = {
  let columns = args.named().at("columns", default: 1)
  let n-cols = if type(columns) == int {
    columns
  } else {
    columns.len()
  }
  let n-rows = calc.ceil(cells.len() / n-cols)
  table(
    columns: columns,
    ..args,
    fill: (_, y) => if y == n-rows - 1 {
      gray.lighten(50%)
    } else {
      none
    },
    ..cells
  )
}
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