Flutter
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Dart 3.10
Kodebits Day 22: Null-Aware Operator
May 13 2026
The ?? operator returns its left operand if not null, otherwise its right.
What does this code output?
void main() {
String? a = null;
String? b = 'Hi';
print(a ?? b ?? 'Bye');
}
Try it in the online Dart Playground →
[spoiler title="Solution"]
Answer:
Hi
Explanation:
The ?? operator chains left-to-right. a is null, so it checks b which is ‘Hi’.
[/spoiler]