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Flutter

Null Safety in Dart

Use sound null safety with `?`, `!`, and required non-nullable types.

Null Safety in Dart — a practical guide to Dart null safety with clear examples you can reuse in real projects.

Flutter Tutorial Series (17/107). Prefer one article? Read the complete Flutter tutorial.

Short description

Null safety prevents many runtime crashes. Prefer safe access over blanket `!`.

Null safety

String? maybeName;
print(maybeName?.length);
final len = maybeName?.length ?? 0;

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