Stdlib

Format and round numbers

Round, floor, and format numbers for reports, and do exact integer math.

Reference

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Sourceupstream/stdlib/number_formatting.vibe
def percent(part: int, whole: int) -> string
  format("%.1f%%", part * 100 / whole)
end

def with_commas(value: int) -> string
  groups = value.abs.to_s.reverse.chars.chunk(3).map { |group| group.join }
  digits = groups.join(",").reverse
  value < 0 ? "-#{digits}" : digits
end

type RunResult = {
  rounding: hash<string, number>,
  formatted: array<string>,
  divmod: [int, int],
  exact_power: string,
  distance: float
}

def run -> RunResult
  price = 19.4567

  {
    rounding: {
      round: price.round,
      round_2: price.round(2),
      floor: price.floor,
      ceil: price.ceil
    },
    formatted: [
      format("%08.3f", price),
      format("%-6s|%6s|", "left", "right"),
      percent(37, 120),
      with_commas(1_234_567),
      with_commas(-9_870)
    ],
    divmod: 1_000.divmod(7),
    exact_power: (2 ** 80).to_s,
    distance: Math.hypot(6, 8)
  }
end

Output

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