Question

My question related to the following 3 code excerpt:

code of class method: start(options = nil)

# File 'lib/rack/server.rb', line 136

def self.start(options = nil)
  new(options).start
end

code of instance method: #initialize(options = nil)

# File 'lib/rack/server.rb', line 174
def initialize(options = nil)
  @options = options
  @app = options[:app] if options && options[:app]
end

code of instance method: #start

# File 'lib/rack/server.rb', line 229
def start
  if options[:warn]
    $-w = true
  end

  ...# more lines that are not related to my question
end

my question is that Should the the local variable options in the instance method start be @options?. In my option,as the first 2 excerpts shows that the options as parameter that pass to initialize, and make it to a instance variable @options, so in the instance method start, it should reference it as @options, instead of options, because the scope of options can’t be accessed by #start

Answer 1

In the same class there are getter method for options:

# File 'lib/rack/server.rb', line 180
def options
  @options ||= parse_options(ARGV)
end

options in #start is a call to this method, not a local variable.