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- <h1>hashCode property</h1>
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- <section id="getter">
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- <span class="returntype">int</span>
- <span class="name ">hashCode</span>
- <div class="features">inherited</div>
- </section>
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- <section class="desc markdown">
- <p>The hash code for this object.</p>
- <p>A hash code is a single integer which represents the state of the object
- that affects <code>operator ==</code> comparisons.</p>
- <p>All objects have hash codes.
- The default hash code represents only the identity of the object,
- the same way as the default <code>operator ==</code> implementation only considers objects
- equal if they are identical (see <code>identityHashCode</code>).</p>
- <p>If <code>operator ==</code> is overridden to use the object state instead,
- the hash code must also be changed to represent that state.</p>
- <p>Hash codes must be the same for objects that are equal to each other
- according to <code>operator ==</code>.
- The hash code of an object should only change if the object changes
- in a way that affects equality.
- There are no further requirements for the hash codes.
- They need not be consistent between executions of the same program
- and there are no distribution guarantees.</p>
- <p>Objects that are not equal are allowed to have the same hash code,
- it is even technically allowed that all instances have the same hash code,
- but if clashes happen too often, it may reduce the efficiency of hash-based
- data structures like <code>HashSet</code> or <code>HashMap</code>.</p>
- <p>If a subclass overrides <code>hashCode</code>, it should override the
- <code>operator ==</code> operator as well to maintain consistency.</p>
- </section>
- <section class="summary source-code" id="source">
- <h2><span>Implementation</span> </h2>
- <pre class="language-dart"><code class="language-dart">external int get hashCode;</code></pre>
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