What is the main role of constant constructors in programming?

Constant constructors in Flutter are used to create immutable objects that can be created at compile time. This allows:

• Improved performance through reuse of identical objects.
• Ensuring data immutability, which reduces the likelihood of errors.

Example of a constant constructor:

class Point {
  final int x;
  final int y;

  const Point(this.x, this.y);
}

void main() {
  const p1 = Point(1, 2);
  const p2 = Point(1, 2);

  print(identical(p1, p2)); // true, objects are identical and reused
}

Thus, the main role is to create optimized, immutable objects that can be used as constants.