[Solved] What will this Ruby code print?class Sample def self.method_added(name) puts "Added: #{name}" end def foo; end def bar; end end | Ruby

Ruby - Advanced Metaprogramming

What will this Ruby code print?

class Sample
  def self.method_added(name)
    puts "Added: #{name}"
  end

  def foo; end
  def bar; end
end

AAdded: foo Added: bar

BAdded: foo

CAdded: bar

DNo output

Step-by-Step Solution

Solution:

Step 1: Recognize method_added triggers for each method
Each time an instance method is defined, method_added is called with that method's name.
Step 2: Count the methods defined
Two methods, foo and bar, are defined, so two outputs occur.
Final Answer:
Added: foo Added: bar -> Option A
Quick Check:
method_added triggers once per method defined [OK]

Quick Trick: method_added runs for every new instance method [OK]

Common Mistakes:

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