"dart nullable variable" Code Answer's
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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"
Source: medium.com
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