Symptom
Genre codes display "UNDEFINED-POP" instead of "STARLIGHT-POP". The genreCode field uses this.album before the Song subclass has initialized it.
What you know
The Track base class computes a genre code during construction by calling an abstract method. The Song subclass implements this method using its own album field. But genre codes always start with "UNDEFINED-".
Hints
TypeScript
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Test Output
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