如何使用哈希多个键生成值为ruby的组合字符串

然而,它可能是一个很酷的运动,它实际上是一个有趣的问题.因此,忽略了不重新发明轮子的最佳实践……你可能不得不以不同的方式对待数百和数千,因为你可以说“二百”,但“二十七”并没有多大意义.

这是我经过严格测试,未经优化的尝试.这是一个概念验证,我很确定我忽略了很多案例.如果您需要更多帮助,请尝试阅读其他人的source code.

首先,我们定义两个哈希值,一个用于数字,一个用于量值(这是不同的,因为它们可以用数字作为前缀以便将它们相乘).

class Integer
  NUMBERS = {
    1 => "one",2 => "two",3 => "three",4 => "four",5 => "five",6 => "six",7 => "seven",8 => "eight",9 => "nine",10 => "ten",11 => "eleven",12 => "twelve",13 => "thirteen",14 => "fourteen",15 => "fifteen",16 => "sixteen",17 => "seventeen",18 => "eighteen",19 => "nineteen",20 => "twenty",30 => "thirty",40 => "forty",50 => "fifty",60 => "sixty",70 => "seventy",80 => "eighty",90 => "ninety"
  }

  MAGNITUDES = {
    100 => "hundred",1000 => "thousand",1000_000 => "million"
  }
end

接下来,定义转换方法.

class Integer
  def to_text
    return nil if self == 0
    if NUMBERS.keys.include? self
      NUMBERS[self]
    elsif self < MAGNITUDES.keys.first
      base = maximum_fitting(NUMBERS,self)
      [NUMBERS[base],(self - base).to_text].compact * "-"
    else
      base = maximum_fitting(MAGNITUDES,self)
      quo,mod = self.divmod(base)
      [quo.to_text,MAGNITUDES[base],mod.to_text].compact * " "
    end
  end

  private

  def maximum_fitting(list,number)
    list.keys.select { |n| n <= number }.last
  end
end

要使用它：

puts 2351.to_text
#=> "two thousand three hundred fifty-one"

puts 14330132.to_text
#=> "fourteen million three hundred thirty thousand one hundred thirty-two"

puts 1000000.to_text
#=> "one million"