[Solved] What is the output of this Ruby code?module M def greet "Hello from M, " + super end end class C prepend M def greet "Hello from C" end end puts C.new.greet | Ruby

Ruby - Modules and Mixins

What is the output of this Ruby code?

module M
  def greet
    "Hello from M, " + super
  end
end

class C
  prepend M
  def greet
    "Hello from C"
  end
end

puts C.new.greet

A"Hello from C"

B"Hello from M, Hello from C"

CNoMethodError

D"Hello from M"

Step-by-Step Solution

Solution:

Step 1: Understand method lookup with prepend
Because M is prepended, its greet method is called first.
Step 2: Follow the super call in module method
The super inside M#greet calls the original greet in C, returning "Hello from C".
Step 3: Combine returned strings
The module method returns "Hello from M, " + "Hello from C" resulting in "Hello from M, Hello from C".
Final Answer:
"Hello from M, Hello from C" -> Option B
Quick Check:
Prepend + super calls original method [OK]

Quick Trick: Prepend runs module method first; super calls original method [OK]

Common Mistakes:

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