module Formatter
def self.format_name(first, last)
"#{last}, #{first}".upcase
end
end
How can you use format_name inside a class Person without repeating the module name every time?
AUse <code>extend Formatter</code> inside the class and call <code>format_name</code> directly
BDefine an instance method that calls <code>Formatter.format_name</code>
CAssign <code>format_name</code> to a local variable
DUse <code>include Formatter</code> inside the class and call <code>format_name</code> directly
Step-by-Step Solution
Solution:
Step 1: Understand method type
format_name is a module method (self method), not an instance method.
Step 2: Analyze extend vs include
extend Formatter adds module's instance methods as class methods to Person, but format_name is not an instance method of Formatter; include Formatter adds instance methods to Person instances.
Step 3: Use wrapper instance method
Defining an instance method in Person that calls Formatter.format_name allows calling it without repeating module name externally.
Final Answer:
Define an instance method that calls Formatter.format_name -> Option B
Quick Check:
Module methods require explicit calls or wrappers = D [OK]
Quick Trick:Wrap module methods in instance methods to avoid repeating module name [OK]
Common Mistakes:
Expecting extend to import module methods as instance methods
Using include to import module methods
Trying to assign method to variable
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