大写和downcase之间交替 [英] Alternate between uppercase and downcase

问题描述

我想询问用户五次输​​入一个单词，并吐口水用大写和小写的每一行交替的答案，而无需使用 each_with_index 方法。我也想给答案按字母顺序排序。下面是我做了什么：

 字= []5.times做
  提出请输入一个字：
  单词LT;＆LT; gets.chomp
结束 words.each做|字|
   如果words.even？
     把words.downcase
   ELSIF words.odd？
     把words.upcase
   结束
 结束
 

但一切我都试过失败。怎样才可以有大写和downcase之间的用户输入备用而不 each_with_index 方法？

解决方案

 字=％W |怎么现在褐牛|枚举= [：upcase，：downcase] .cycle
words.map {| W | w.send enum.next}
  ＃=＆GT; [HOW，现在，棕色，牛]
 

I'm trying to ask the user five times to enter a word, and spat the answers on each line alternating with uppercase and lowercase, without using the each_with_index method. I'm also trying to sort the answers alphabetically. Below is what I have done:

words = []

5.times do
  puts "Please enter a word:"
  words << gets.chomp
end

 words.each do |word|
   if words.even?
     puts words.downcase
   elsif words.odd?
     puts words.upcase
   end
 end

but everything I have tried has failed. How can I have the user input alternate between uppercase and downcase without the each_with_index method?

解决方案

words = %w| how now brown cow |

enum = [:upcase, :downcase].cycle
words.map { |w| w.send enum.next }
  #=> ["HOW", "now", " BROWN", "cow"]

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