equals method

  1. @override
bool equals(
  1. T? e1,
  2. T? e2
)

Compare two elements for being equal.

This should be a proper equality relation.

Implementation

@override
bool equals(T? e1, T? e2) =>
    (e1 != null && e2 != null && base.equals(e1, e2)) || e1 == null && e2 == null;