Multiple ChoiceIntermediate 45s
OCP via data, not classes
Which change to a pricing engine is usually the cheapest way to add a new promotion without modifying existing code?
Options
- 1Create a new subclass of the engine for each promotion
- 2Copy the engine file and edit the copy
- 3Model promotions as data-driven rules evaluated by one stable engine
- 4Add another boolean flag to an ever-growing options struct
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