Bundle data that travels together
Introduce a parameter object when repeated parameters form one domain concept.
A pricing function takes seven parameters, and several callers pass them in different orders. The next rule needs another pricing fact. Introduce Parameter Object when a set of parameters forms a cohesive domain concept that travels together. The trap is creating a vague Options bag that accepts every future value and hides which data is required. Before priceQuote(cart, plan, region, currency, taxId, contractStart, salesChannel, discountCode) After priceQuote(cart, quoteContext, discountCode) QuoteContext = { plan, region, currency, taxId, contractStart, salesChannel } Find repeated travel Look for the same parameter cluster appearing in multiple calls. Repeated travel is evidence of a missing concept.…
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