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void main() {

  //Declaring age.
  int age = 43;

  //An if statement that is processed but breaks the program as hasBills has not been defined. This is an element of scope.
  if (age == 43) {

    //Can’t define hasBills, bad scope.
    print("You are 43 and have bills : ${hasBills}");

  }else{

    //Defining has bills here is too late as the program has broken.
    bool hasBills = true;
    print("You are ${age} and have bills ${hasBills}");

  }

}