Picture.fromMap constructor
It creates a new instance of the Picture class from a map.
Args: map (Map<String, dynamic>): The map of data that we're going to use to create the Picture object.
Implementation
factory Picture.fromMap(Map<String, dynamic> map) {
return Picture(
large: map['large'] != null ? map['large'] as String : null,
medium: map['medium'] != null ? map['medium'] as String : null,
thumbnail: map['thumbnail'] != null ? map['thumbnail'] as String : null,
);
}