Long Parameter List

Ruby supports positional method arguments which can lead to Long Parameter Lists.

Symptoms

• You can’t easily change the method’s arguments.
• The method has three or more arguments.
• The method is complex due to number of collaborating parameters.
• The method requires large amounts of setup during isolated testing.

Solutions

• Introduce Parameter Object⭐ and pass it in as an object of naturally grouped attributes.
• Extract Class⭐ if the method is complex due to the number of collaborators.