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Object property lookup
Learn Object property lookup in ActionScript 3 with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.
Object property lookup is an atomic ActionScript 3 topic inside Collections & XML. The example below uses the actual construct named by the lesson rather than a generic placeholder.
Focus on what Object property lookup changes: the input, binding, control path, object state, collection, runtime effect, or language contract. Then alter one value and verify that the behavior changes for a reason specific to this feature.
Topic-specific example
var o:Object={sku:"A17"}; trace(o["sku"]);
Pay attention to the contract exposed by the type, which members belong to instances versus the type itself, and what dispatch occurs at runtime.