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    <p>Old thread I know, but still worth posting.</p> <blockquote> <p>const jonny1 : Person = new Person("jonny", 26); const jonny2 : Person = new Person("jonny", 26);</p> <p>is creating two completely different objects that will not compare using ==, guess I don't see why it's any more of a road block because of as3</p> </blockquote> <p>The problem with AS3/JavaScript/EcmaScript is not that they create two different, equivalent objects.</p> <p>The problem is that they cannot equate those two equivalent objects--only identity works, since there is no equals or hashCode methods that can be overriden with class-specific comparison logic.</p> <p>For Map implementations such as dynamic Object or Dictionary, this means that you have to either use Strings or references as keys: you cannot recover objects from a map using different but equivalent objects.</p> <p>To work around that problem, people either resort to strict toString implementations (for Object maps) which is undesirable, or to instance control for Dictionaries, as in @back2dos example, which introduces different problems (Also, note that @back2dos solution does not really guarantee unique Person instances since there is a time window during which asynchronous threads will be allowed to instantiate new Persons).</p> <p>@A.Levy's solution is good except that in general, hashCodes are not strictly required to issue unique values (they are meant to map entries to buckets allowing for fast lookups, wherein fine-grained differentiation is done through equals method).</p> <p>You need <strong>both</strong> a hashCode and an equals method, e.g.</p> <pre><code>public interface IEquable { function equals(object : Object) : Boolean; function hash():String; } </code></pre>
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