[Solved] Identify the error in the following Ruby code that tries to use a module as a mixin: module Helper def help "Helping" end end class User extend Helper end puts User.new.help | Ruby

Ruby - Modules and Mixins

Identify the error in the following Ruby code that tries to use a module as a mixin:

module Helper
  def help
    "Helping"
  end
end

class User
  extend Helper
end

puts User.new.help

AUsing extend instead of include causes NoMethodError on instance

BModule Helper is not defined properly

CUser class should be a module

Dhelp method should be a class method

Step-by-Step Solution

Solution:

Step 1: Understand extend vs include
extend Helper adds methods as class methods, not instance methods.
Step 2: Analyze method call on instance
User.new.help calls help on an instance, but method is only on class, causing NoMethodError.
Final Answer:
Using extend instead of include causes NoMethodError on instance -> Option A
Quick Check:
extend adds class methods, not instance methods [OK]

Quick Trick: Use include for instance methods, extend for class methods [OK]

Common Mistakes:

Master "Modules and Mixins" in Ruby

9 interactive learning modes - each teaches the same concept differently

More Ruby Quizzes

Identify the error in the following Ruby code that tries to use a module as a mixin: