convertMass function

double convertMass(Mass from, Mass to, double value)

Convert Mass. 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 mass = convertMass(
   Mass.kilogram, // from
   Mass.gram, // to
   1, // value
 );
 print(mass); // 1000
}

Read the documentation for more information

Implementation

double convertMass(Mass from, Mass to, double value) {
  verify(from, to, value);
  if (from == to) return value;
  if (from == Mass.gram) {
    switch (to) {
      case Mass.tonne:
        return value / 1e+9;
      case Mass.kilogram:
        return value / 1000;
      case Mass.milligram:
        return value * 1000;
      case Mass.microgram:
        return value * 1e+6;
      case Mass.imperialTon:
        return value / 1.016e+6;
      case Mass.usTon:
        return value / 907185;
      case Mass.stone:
        return value / 6350;
      case Mass.pound:
        return value / 454;
      case Mass.ounce:
        return value / 28.35;
      default:
        return value;
    }
  } else {
    final gram = Mass.gram;
    switch (from) {
      case Mass.tonne:
        return convertMass(gram, to, value * 1e+9);
      case Mass.kilogram:
        return convertMass(gram, to, value * 1000);
      case Mass.milligram:
        return convertMass(gram, to, value / 1000);
      case Mass.microgram:
        return convertMass(gram, to, value / 1e+6);
      case Mass.imperialTon:
        return convertMass(gram, to, value * 1.016e+6);
      case Mass.usTon:
        return convertMass(gram, to, value * 907185);
      case Mass.stone:
        return convertMass(gram, to, value * 6350);
      case Mass.pound:
        return convertMass(gram, to, value * 454);
      case Mass.ounce:
        return convertMass(gram, to, value * 28.35);
      default:
        return value;
    }
  }
}