Conditional methods

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What is the return value of the following Ruby code?

class Greeting
  def self.hello = "hello" if false
end

Greeting.hello # => ???

The correct answer is

nil

"hello"

It raises SyntaxError

It raises NoMethodError

def self.hello = "hello" if false

is interpreted as

(def self.hello = "hello") if false

So as the if-statement is falsey then (def self.hello = "hello") is never executed and Greeting.hello is never created.