operator + method

FeatureCollection operator +(dynamic other)

Returns the addition of the current FeatureCollection and the other, which is a Feature, a List of Features, or FeatureCollection. If the other is a Feature, it is added to the FeatureCollection. If the other is a FeatureCollection, it is added to the FeatureCollection. If the other is not a Feature or FeatureCollection, it throws an ArgumentError.

Example:

FeatureCollection([
  Point(Coordinate(1, 2)),
  Point(Coordinate(5, 6))
]) + Point(Coordinate(7, 8)); // FeatureCollection([Point(1, 2), Point(5, 6), Point(7, 8)])

FeatureCollection([
  Point(Coordinate(1, 2)),
  Point(Coordinate(5, 6))
]) + FeatureCollection([Point(7, 8)]); // FeatureCollection([Point(1, 2), Point(5, 6), Point(7, 8)])

FeatureCollection([
  Point(Coordinate(1, 2)),
  Point(Coordinate(5, 6))
]) + LineString([Coordinate(7, 8), Coordinate(9, 10)]); // FeatureCollection([Point(1, 2), Point(5, 6), LineString([Coordinate(7, 8), Coordinate(9, 10)])])

FeatureCollection([
 Point(Coordinate(1, 2)),
Point(Coordinate(5, 6))
]) + MultiPoint([Coordinate(7, 8)]); // FeatureCollection([Point(1, 2), Point(5, 6), MultiPoint([Coordinate(7, 8)])])

FeatureCollection([
  Point(Coordinate(1, 2)),
  Point(Coordinate(5, 6))
]) + 5; // throws ArgumentError

Implementation

FeatureCollection operator +(dynamic other) {
  if (other is FeatureCollection) {
    return FeatureCollection(features + other.features);
  } else if (other is Feature) {
    return FeatureCollection(features + [other]);
  } else if (other is List<Feature>) {
    return FeatureCollection(features + other);
  } else {
    throw ArgumentError('Unsupported type: ${other.runtimeType}');
  }
}