如何将附加数据设置为散列中的键

Question

我试图让日期成为我的哈希键，然后让余额的总和成为我的哈希数组中的值，以便稍后在返回将打印日期、金额和金额的账户报表时使用哈希余额。

代码如下：

class Bank
  attr_accessor :total, :time

  def initialize
    @total = 0
    @time = [:date => @total]
  end

  def deposit(sum)
     @total += sum
  end

  def withdrawl(sum)
    @total -= sum
  end

  def input_time
    @time << Time.now.strftime('%d/%-m/%Y')
  end

  def yesterday
    @time << Time.at(Time.now.to_i - 86400).strftime('%d/%-m/%Y')
   end
end

如何让日期成为散列键？我目前正在尝试将其附加到数组中，但这只是添加到数组中。

Answer 1

据我了解，您想添加一些东西作为散列的键。

你可以用 merge! 来做，像这样：

require "time"
time = DateTime.now.to_s
hash = {}
value = "value123"
hash.merge!("#{time}": "#{value123}")
p hash

#=> {:"2020-02-24T18:36:40+04:00"=>"value123"}
#merge!("KEY": "VALUE")

这是 APIdock 上 Ruby 部分的 merge! 文档：

Adds the contents of other_hash to hsh. If no block is specified, entries with duplicate keys are overwritten with the values from other_hash, otherwise the value of each duplicate key is determined by calling the block with the key, its value in hsh and its value in other_hash.

如何将附加数据设置为散列中的键

How to set the appended data as the key in a hash

ruby

ruby-hash