f8.1/sdk/dart/package-fidl_fidl/Union/operator_equals.md

# operator == method







- @override

bool operator ==
(dynamic other)

_<span class="feature">override</span>_



<p>The equality operator.</p>
<p>The default behavior for all <code>Object</code>s is to return true if and
only if this object and <code>other</code> are the same object.</p>
<p>Override this method to specify a different equality relation on
a class. The overriding method must still be an equivalence relation.
That is, it must be:</p>
<ul>
<li>
<p>Total: It must return a boolean for all arguments. It should never throw.</p>
</li>
<li>
<p>Reflexive: For all objects <code>o</code>, <code>o == o</code> must be true.</p>
</li>
<li>
<p>Symmetric: For all objects <code>o1</code> and <code>o2</code>, <code>o1 == o2</code> and <code>o2 == o1</code> must
either both be true, or both be false.</p>
</li>
<li>
<p>Transitive: For all objects <code>o1</code>, <code>o2</code>, and <code>o3</code>, if <code>o1 == o2</code> and
<code>o2 == o3</code> are true, then <code>o1 == o3</code> must be true.</p>
</li>
</ul>
<p>The method should also be consistent over time,
so whether two objects are equal should only change
if at least one of the objects was modified.</p>
<p>If a subclass overrides the equality operator, it should override
the <a href="../../package-fidl_fidl/Union/hashCode.md">hashCode</a> method as well to maintain consistency.</p>



## Implementation

```dart
@override
bool operator ==(dynamic other) {
  if (identical(this, other)) {
    return true;
  }
  if (runtimeType != other.runtimeType) {
    return false;
  }
  final Union otherUnion = other;
  if ($ordinal != otherUnion.$ordinal) {
    return false;
  }
  return deepEquals($data, otherUnion.$data);
}
```