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dart nullable variable
// type? variable; variable can be null. int a?; // a can be null e1?.[e2] // null if e1 is null; otherwise it’s e1[e2] /* This requires the 'non-nullable' language feature to be enabled. In pubspec.yaml, set the minimum SDK constraint to 2.12.0 or higher and running 'pub get'. */ environment: sdk: ">=2.12.0 <3.0.0"
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