Update.fromJson constructor
Implementation
Update.fromJson(Map<String, dynamic> json)
: ts = json['ts'],
type = datatypeTyped(json['type']),
val = json.containsKey('val') ? (json['val']).toDouble() : null,
d = json.containsKey('d')
? (json['d'] as List).map((i) => i as double).toList()
: null;