convertVolume function

double convertVolume(Volume from, Volume to, double value)

Convert Volume. It may lose some decimals in the proccess.

from, to and value can NOT be null, otherwise an AssertionError is thrown

Basic usage:

main() {
  final volume = convertVolume(
    Volume.litre, // from
    Volume.millilitre, // to
    1, // value
  );
  print(volume); // 1000
}

Read the documentation for more information

Implementation

double convertVolume(
  Volume from,
  Volume to,
  double value,
) {
  verify(from, to, value);
  if (from == to) return value;
  if (from == Volume.litre) {
    switch (to) {
      case Volume.usLiquidGallon:
        return value / 3.785;
      case Volume.usLiquidQuart:
        return value / 1.057;
      case Volume.usLiquidPint:
        return value * 2.113;
      case Volume.usLegalCup:
        return value * 4.167;
      case Volume.usFluidOunce:
        return value * 33.814;
      case Volume.usTablespoon:
        return value * 67.628;
      case Volume.usTeaspoon:
        return value * 203;
      case Volume.millilitre:
        return value * 1000;
      case Volume.gallon:
        return value / 4.546;
      case Volume.cubicFoot:
        return value / 28.317;
      case Volume.cubicInch:
        return value * 61.024;
      case Volume.imperialQuart:
        return value / 1.137;
      case Volume.imperialPint:
        return value * 1.76;
      case Volume.imperialCup:
        return value * 3.52;
      case Volume.fluidOunce:
        return value * 35.195;
      case Volume.imperialTablespoon:
        return value * 56.312;
      case Volume.imperialTeaspoon:
        return value * 169;
      default:
        return value;
    }
  } else {
    final litre = Volume.litre;
    switch (from) {
      case Volume.usLiquidGallon:
        return convertVolume(litre, to, value * 3.785);
      case Volume.usLiquidQuart:
        return convertVolume(litre, to, value * 1.057);
      case Volume.usLiquidPint:
        return convertVolume(litre, to, value / 2.113);
      case Volume.usLegalCup:
        return convertVolume(litre, to, value / 4.167);
      case Volume.usFluidOunce:
        return convertVolume(litre, to, value / 33.814);
      case Volume.usTablespoon:
        return convertVolume(litre, to, value / 67.628);
      case Volume.usTeaspoon:
        return convertVolume(litre, to, value / 203);
      case Volume.millilitre:
        return convertVolume(litre, to, value / 1000);
      case Volume.gallon:
        return convertVolume(litre, to, value * 4.546);
      case Volume.cubicFoot:
        return convertVolume(litre, to, value * 28.317);
      case Volume.cubicInch:
        return convertVolume(litre, to, value / 61.024);
      case Volume.imperialQuart:
        return convertVolume(litre, to, value * 1.137);
      case Volume.imperialPint:
        return convertVolume(litre, to, value / 1.76);
      case Volume.imperialCup:
        return convertVolume(litre, to, value / 3.52);
      case Volume.fluidOunce:
        return convertVolume(litre, to, value / 35.195);
      case Volume.imperialTablespoon:
        return convertVolume(litre, to, value / 56.312);
      case Volume.imperialTeaspoon:
        return convertVolume(litre, to, value / 169);
      default:
        return value;
    }
  }
}