copy method
Copy the value of the object.
growable
Can the generated collection be variable.
The method is to solve the following problems:
List<int> a = <int>[1,2,3];
List<int> b = a;
a.add(4);
print(a); // [1,2,3,4]
print(b); // [1,2,3,4]
Implementation
List<E> copy({bool growable = true}) {
return List<E>.from(this, growable: growable);
}