ruby - 哈希需要根据用户的输入进行处理

Question

我需要一个散列来涉及其他散列，并根据用户选择的内容执行操作。代码:

    puts "Indicate name of the bank:"
    bank_name = gets.chomp

    puts "Money to invest:"
    money_invested = gets.to_i 

    puts "Indicate time of investment:"
    time_investment = gets.to_i

    bank_one = { 30 => 1.0219, 45 => 1.0336, 60 => 1.0467 }
    bank_two = { 30 => 1.0348, 45 => 1.5897, 60 => 1.0987 }
    back_three = { 30 => 1.0489, 45 => 1.5999, 60 => 1.1589 }
    investment_calculation = money_invested * NEWHASHNEEDEDHERE[time_investment]

    puts "Your money is now of $#{investment_calculation}." 

根据用户在bank_name 上的选择，正确的散列应该被寻址，从而操作。我需要一个包含这段代码的“ super 哈希”:

    bank_one = { 30 => 1.0219, 45 => 1.0336, 60 => 1.0467 }
    bank_two = { 30 => 1.0348, 45 => 1.5897, 60 => 1.0987 }
    back_three = { 30 => 1.0489, 45 => 1.5999, 60 => 1.1589 }

而且，这个新的散列应该在这个变量中被寻址:

    investment_calculation = money_invested * NEWHASHNEEDEDHERE[time_investment]

Answer 1

您可以如下所示定义散列的散列，并使用[] 运算符访问它

interest_rates = {
    "bank_one" => { 30 => 1.0219, 45 => 1.0336, 60 => 1.0467 },
    "bank_two" => { 30 => 1.0348, 45 => 1.5897, 60 => 1.0987 },
    "bank_three" => { 30 => 1.0489, 45 => 1.5999, 60 => 1.1589 }
}
investment_calculation = money_invested * interest_rates[bank_name][time_investment]