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How do I assign the length of a list to a double in Flutter?

I am trying to assign the length of a list to a double and it says that an instance member can’t be accessed in an initializer:

List numlist = [1,2,3,4,5];
double size = numlist.length.toDouble();

Is there a way to get this to work?

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2

Answers


  1. 0

    use late to declare a variable that will be initialized at a later time

    List numlist = [1,2,3,4,5];
late double size = numlist.length.toDouble();

    in this case, size should be initialized after numlist

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  2. 0

    Use Getter: Dynamically computes the size whenever it is accessed, ensuring it is always up-to-date with the current length of the list.

    For example:

      List<int> numlist = [1, 2, 3, 4, 5];

  double get size {
    return numlist.length.toDouble();
  }
  
  void test() {
    final result = size;
  }
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