Divergent Change.
You find yourself having to change many unrelated methods when you make changes to a class. For example, when adding a new product type you have to change the methods for finding, displaying, and ordering products.
##Signs and Symptoms
You find yourself having to change many unrelated methods when you make changes to a class. For example, when adding a new product type you have to change the methods for finding, displaying, and ordering products.
class Order {
void applyVat2024() {}
void applyVat2025() {}
void formatEuInvoice() {}
void formatUsInvoice() {}
}##Reasons for the Problem
Often these divergent modifications are due to poor program structure or “copypasta programming”.
##Treatment
Refactor with
##Payoff
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Improves code organization.
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Reduces code duplication.
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Simplifies support.