[Solved] What will be the output of this Ruby code? class Greeter def initialize(name) @name = name define_method(:greet) { "Hello, #{@name}!" } end end g = Greeter.new('Alice') puts g.greet | Ruby

Ruby - Advanced Metaprogramming

What will be the output of this Ruby code?

class Greeter
  def initialize(name)
    @name = name
    define_method(:greet) { "Hello, #{@name}!" }
  end
end

g = Greeter.new('Alice')
puts g.greet

AHello, @name!

BHello, Alice!

CError: undefined method greet

DHello, !

Step-by-Step Solution

Solution:

Step 1: Understand define_method with closure
The block captures @name from the instance, so it uses 'Alice' when greet is called.
Step 2: Check output of puts g.greet
It prints "Hello, Alice!" because @name is 'Alice'.
Final Answer:
Hello, Alice! -> Option B
Quick Check:
Closure captures @name = 'Alice' [OK]

Quick Trick: define_method block remembers instance variables [OK]

Common Mistakes:

Expecting literal '@name' output
Thinking method is undefined
Ignoring closure capture

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What will be the output of this Ruby code?

Step 1: Understand define_method with closure

Step 2: Check output of puts g.greet

Final Answer:

Quick Check:

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