In Flutter (Dart), you can use the sort method on a list of objects, along with a custom comparator function, to sort the list by the alphabetical order of one of its properties.

Here’s an example of how you can sort a list of objects (let’s say they’re called Person) by their name property:

List<Person> people = [
  Person(name: "Bob"),
  Person(name: "Charlie"),
  Person(name: "Alice"),
];

people.sort((a, b) => a.name.compareTo(b.name));

In this example, the sort method takes a comparator function as its argument. The comparator function compares two Person objects and returns a negative, zero, or positive value, depending on whether the first object should be sorted before, in the same position as, or after the second object. In this case, it compares the name property of each object using the compareTo method and sorts them alphabetically.

Another way to sort by one property is to use the sortBy method from the ‘dart:collection’ package:

import 'dart:collection';

people.sortBy((person) => person.name);

This will sort the list of people based on the name property.