FLUTTER INTERVIEW QUESTIONS

What’s the difference between const and final in Dart?

Both final and const prevent a variable from being reassigned and const variables are implicitly final.

So, once you assign value to a const or final variable, you can not change it.

A const variable is a compile-time constant, which means that it must be created from constants available in compile-time.

void main() {
  const int a = 3;
  final int b = 4;
  const int c = a * 9;
  const int d = a * b; //this will not compile
  final DateTime now = DateTime.now();
  const DateTime anotherNow = DateTime.now(); //this will not compile
  a = 5; //this will not compile
  b = 6; //this will not compile
}

📖 Use https://dartpad.dartlang.org/ for testing examples 📖