compareTo method

@override int compareTo(T other)

Compares this object to another object.

Returns a value like a Comparator when comparing this to other. That is, it returns a negative integer if this is ordered before other, a positive integer if this is ordered after other, and zero if this and other are ordered together.

The other argument must be a value that is comparable to this object.

Implementation

@override
int compareTo(T other) {
  if (other == null) {
    throw UnsupportedError('Null used in value comparison in $this');
  }

  if (this > other) {
    return 1;
  }

  if (this == other) {
    return 0;
  }

  if (this < other) {
    return -1;
  }

  throw UnsupportedError(
    'Comparing $this and $other returned false for >, == and <',
  );
}