如何在 Dart 中按 bool 对列表进行排序

Question

How do you sort a List in dart based on a bool value, the compareTo method doesn't work with bool . I want true values to appear at the top of the list.

Answer 1

You can define your own compare function for bool and pass it to the sort method of List .

Example with booleans as your bool List :

booleans.sort((a, b) {
  if(b) {
    return 1;
  }
  return -1;
});

This example tells the sort method that true elements should be sorted higher than false elements.

Answer 2

booleans.sort((a, b) => b ? 1 : -1);

Answer 3

I just got the same issue, I solve it using the.toString() function. So it's sort separating the 0's to the 1's.

In this case I got a list of forms, some are synced and others no.

Here's my code:

final forms = state.forms
        ..sort(
          (a, b) => a.synced.toString().compareTo(b.synced.toString()),
        );

Hope it works for you.