Syntax error: initialization with splat operator and empty hash

Question

我有以下代码，据我所知应该可以正常工作但不能：

def calculate( *nums, options = {} ) //errors out here on equals sign
  if options.empty
    return add(nums)
  elsif options[:subtract]
    return substract(nums)
  elsif options[:add]
    return add(nums)
  end
end

错误：

class: SyntaxError message: /opt/eval-server/eval-server/app/models/eval_spec_runner.rb:5: syntax error, unexpected '=', expecting ')' def calculate( *nums, options = {} ) ^ backtrace: RubyMonk:18:in `eval'

Answer 1

splat 参数必须是方法的最后一个参数。