Multiple ChoiceIntermediate 45s
Make illegal states unrepresentable
Which technique best encodes the rule 'a refund is either pending with an amount or completed with a receipt'?
Options
- 1A tagged union / sum type where each variant carries only its valid fields
- 2A class with every field left nullable alongside a status enum used to track the state
- 3Two independent boolean flags, isPending and isCompleted, guarding the refund's fields
- 4A plain map of strings to objects keyed by the refund's current status value
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