class Opal::Rewriters::InlineArgs::Initializer

def extract_optargs
  has_post_args = @args.has_post_args?
  @args.optargs.each do |arg|
    if has_post_args
      # optional post argument like 'def m(opt = 1, a)'
      arg_name, default_value = *arg
      @initialization << arg.updated(:extract_post_optarg, [arg_name, default_value, args_to_keep])
      @inline << s(:fake_arg)
    else
      # optional inline argument like 'def m(a, opt = 1)'
      @inline << arg.updated(:arg)
      @initialization << arg.updated(:extract_optarg)
    end
  end
end