WAT

wat.rb

def all_or_nothing_a(value)
  if value.eql? :all
    'You win!'
  elsif
    value
  end
end

def all_or_nothing_b(value)
  if value.eql? :all
    'You win!'
  end
end

def all_or_nothing_c(value)
  if value.eql? :all
    'You win!'
  elsif value
    nil
  end
end

all_or_nothing_a :all
# => "You win!"
all_or_nothing_b :all
# => "You win!"
all_or_nothing_c :all
# => "You win!"

all_or_nothing_a "Better luck next time"
#  => nil
all_or_nothing_b "Better luck next time"
#  => nil
all_or_nothing_c "Better luck next time"
#  => nil

• In terms of output, the methods all_or_nothing_a and all_or_nothing_b are equivalent to all_or_nothing_c.
• One deviation of internal functionality is that all_or_nothing_b never invokes value, whereas a and c do.

I don't understand what's surprising here. There's no return value specified for all_or_nothing_a, so I'd expect it to be nil. Unless I'm missing something?