compareToIntNullable method

@useResult int compareToIntNullable(int? second)

Returns a negative value if this is less than second, zero if they are equal, and a positive value if this is greater than second.

Null values are considered less than non-null values. Two null values are considered equal.

Implementation

@useResult
int compareToIntNullable(int? second) {
  final int? self = this;
  // ref: https://stackoverflow.com/questions/61881850/sort-list-based-on-boolean
  if (self == second) {
    // same
    return 0;
  }

  // this is smaller
  if (self == null) {
    return -1;
  }

  // second is smaller
  if (second == null) {
    return 1;
  }

  return self < second ? -1 : 1;
}