convertLength function

double convertLength(Length from, Length to, double value)

Convert Length. 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 length = convertLength(
   Length.centimeter, // from
   Length.meter, // to
   100, // value
 );
 print(length); // 1
}

Read the documentation for more information

Implementation

double convertLength(Length from, Length to, double value) {
  verify(from, to, value);
  if (from == to) return value;
  if (from == Length.meter) {
    switch (to) {
      case Length.centimeter:
        return value * 100;
      case Length.kilometer:
        return value / 1000;
      case Length.millimeter:
        return value * 1000;
      case Length.micrometer:
        return value * 1e+6;
      case Length.nanometer:
        return value * 1e+9; // approach
      case Length.mile:
        return value / 1609; // approach
      case Length.yard:
        return value * 1.094; // approach
      case Length.feet:
        return value * 3.281; // approach
      case Length.inch:
        return value * 39.37;
      case Length.nautical_mile:
        return value / 1852;
      case Length.meter:
        return value;
      default:
        return value;
    }
  } else {
    switch (from) {
      case Length.centimeter:
        return convertLength(Length.meter, to, value * 100);
      case Length.kilometer:
        return convertLength(Length.meter, to, value * 1000);
      case Length.millimeter:
        return convertLength(Length.meter, to, value / 1000);
      case Length.micrometer:
        return convertLength(Length.meter, to, value / 1e+6);
      case Length.nanometer:
        return convertLength(Length.meter, to, value / 1e+9); // approach
      case Length.mile:
        return convertLength(Length.meter, to, value * 1609); // approach
      case Length.yard:
        return convertLength(Length.meter, to, value / 1.094); // approach
      case Length.feet:
        return convertLength(Length.meter, to, value / 3.281); // approach
      case Length.inch:
        return convertLength(Length.meter, to, value / 39.37);
      case Length.nautical_mile:
        return convertLength(Length.meter, to, value * 1852);
      default:
        return value;
    }
  }
}