Dart if object==null

In other languages we can use the logical-or shortcut. If maybeSomeNumber() 
returns null, assign a default value of 2:

value = maybeSomeNumber() || 2

In Dart we can’t do this because the expression needs to be a boolean (“the 
operands of the || operator must be assignable to bool").
That’s why the ?? operator exists:

var value = maybeSomeNumber() ?? 2;

Source: flutterigniter.com

Similar codes

1 vote188 views1 answer
Flutter textbutton autofocus
Dart
0 vote180 views1 answer
Lazy iterable dart
Dart
2 votes184 views1 answer
Flutter tooltip margin and padding
Dart
2 votes182 views1 answer
Flutter tooltip padding
Dart
5 votes197 views1 answer
Flutter appbar leading icon
Dart
2 votes188 views2 answers
Button shape flutter
Dart
7 votes267 views3 answers
Kill dart process
Dart
1 vote183 views1 answer
Flutter tooltip circle border
Dart
0 vote181 views2 answers
Pub http
Dart
2 votes173 views1 answer
Flutter flotingactionbutton color
Dart