convertEnergy function

double convertEnergy(Energy from, Energy to, double value)

Convert energy. Some decimals may be lost in the proccess.

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

Basic usage:

main() {
 final energy = convertEnergy(
   Energy.kilocalorie, // from
   Energy.gramCalorie, // to
   1, // value
 );
 print(energy); // 1000
}

Read the documentation for more information

Implementation

double convertEnergy(Energy from, Energy to, double value) {
  verify(from, to, value);
  if (from == to) return value;
  if (from == Energy.joule) {
    switch (to) {
      case Energy.kilojoule:
        return value / 1000;
      case Energy.gramCalorie:
        return value / 4.184;
      case Energy.kilocalorie:
        return value / 4184;
      case Energy.wattHour:
        return value / 3600;
      case Energy.kilowattHour:
        return value / 3.6e+6;
      case Energy.electronvolt:
        return value / 6.242e+18;
      case Energy.britishThermalUnit:
        return value / 1055;
      case Energy.usTherm:
        return value / 1.055e+8;
      case Energy.foot_pound:
        return value / 1.356;
      default:
        return value;
    }
  } else {
    final joule = Energy.joule;
    switch (from) {
      case Energy.kilojoule:
        return convertEnergy(joule, to, value * 1000);
      case Energy.gramCalorie:
        return convertEnergy(joule, to, value * 4.184);
      case Energy.kilocalorie:
        return convertEnergy(joule, to, value * 4184);
      case Energy.wattHour:
        return convertEnergy(joule, to, value * 3600);
      case Energy.kilowattHour:
        return convertEnergy(joule, to, value * 3.6e+6);
      case Energy.electronvolt:
        return convertEnergy(joule, to, value * 6.242e+18);
      case Energy.britishThermalUnit:
        return convertEnergy(joule, to, value * 1055);
      case Energy.usTherm:
        return convertEnergy(joule, to, value * 1.055e+8);
      case Energy.foot_pound:
        return convertEnergy(joule, to, value * 1.356);
      default:
        return value;
    }
  }
}