isMetricUnit method Null safety

bool isMetricUnit(
  1. String unit
)

Checks if the distance reference unit is the metricUnit

Implementation

static bool isMetricUnit(String unit) {
  assert(DistanceUnits.distanceUnits.contains(unit),
      'Unit must be either ${DistanceUnits.distanceUnits.join(' or ')}');

  return unit == DistanceUnits.metricUnit;
}