Introduce Null Object
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Revision as of 02:49, 28 September 2008
Summarised from Refactoring Martin Fowler 1999
Motivation
You have repeated checks for a null value
For example your code my look like:
if (customer == null) plan = BillingPlan.basic(); else plan = customer.getPlan();
Solution
Replace your check for a null value with a null object
