Question

Ruby的新手，我正在尝试接受方法中的多个splat参数。我想我理解为什么它给我编译错误，但我不知道如何解决它。任何有关如何在参数中使用多个splats的帮助都会有所帮助。提前感谢您的任何指导。

def find_max_expenses(salary, save_prcnt, *pre_ret_g_rates, *post_ret_g_rates, epsilon)
 years = pre_ret_g_rates.count
 savings = nest_egg_variable(salary, save_prcnt, pre_ret_g_rates)
 savings = savings[-1]
 low = 0
 high = savings
 expenses = (low + high) / 2

 # can use the [-1] at the end is equivalent to the code below
 remaining_money = post_retirement(savings, post_ret_g_rates, expenses)   #[-1]
 remaining_money = remaining_money[-1]
 while remaining_money > epsilon       # the value we want to stay above
  if remaining_money > 0
   low = expenses
  else
   high = expenses
  end
  expenses = (high + low) / 2
  remaining_money = post_retirement(savings, post_ret_g_rates, expenses)
  p remaining_money = remaining_money[-1]
 end
 p expenses
end
find_max_expenses(10000, 10, [3, 4, 5, 0, 3], [10, 5, 0, 5, 1], 0.01)

Answer 1

使用splat参数的示例：

def sum(*nums)
  sum = 0 
  nums.each do |num|
    sum += num 
  end 
  sum 
end

puts sum(1,2,3)

注意如何直接指定参数，而不是[]内部。

如果方法定义了第二个splat参数，则无法确定第一个参数何时结束，第二个参数何时开始。

Ruby 1.9.2 - 多个splat参数问题

1 个答案: