main.dart

class Color {
    final int value;
    const Color._internal(this.value);

    static const Color WHITE = const Color._internal(0);
    static const Color BLACK = const Color._internal(1);
    
    @override
    bool operator==(Object o) => identical(this, o) ||
      o is Color && value == o.value;
    @override
    int get hashCode => value.hashCode;
    String toString() => (this == WHITE) ? 'w' : 'b';
}

Map<Color, List> PAWN_OFFSETS =  {
    Color.BLACK: const [16, 32, 17, 15],
    Color.WHITE: const [-16, -32, -17, -15]
};

 
void main() {
	print(PAWN_OFFSETS[Color.BLACK]);

}