how to null check in dart code example

Example 1: dart string empty or null

Testing empty or null, use Dart's safe navigation

if (mystring?.isEmpty ?? true) {
  // 
}

Example 2: dart null aware operator ??

print(1 ?? 3); // <-- Prints 1.
print(null ?? 12); // <-- Prints 12.

int a; // The initial value of a is null.
a ??= 3;
print(a); // <-- Prints 3.

a ??= 5;
print(a); // <-- Still prints 3.