Could you explain what is meant by immutable objects in programming?

Immutable objects are objects whose state cannot be changed after creation. In programming, this means that all fields of the object are set during initialization and cannot be modified afterward.

In Flutter and Dart, immutability is often used to increase code reliability and predictability, especially in multithreaded applications and when working with UI state.

Example of an immutable class in Dart:

class Point {
  final double x;
  final double y;

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

void main() {
  final p = Point(1, 2);
  // p.x = 3; // Error: cannot modify final field
}

Here, the fields x and y are declared as final, and the constructor is const, which guarantees the immutability of class instances.