Question

是否有一个Ruby / Rails“魔术”助手来自一系列单词，比如

["Sugar", "Water", "Lemons", "Tea"]

到一个可以放在句子中的单个字符串：

"Sugar, Water, Lemons and Tea"

我知道array.join()，但最后一个条目前的“和”很重要我只是问，因为我知道Ruby和Rails有很多有用的方法潜伏在黑暗中我想尽可能保持我的代码干净

Answer 1

似乎这就是你正在寻找的东西：）

http://apidock.com/rails/Array/to_sentence

to_sentence(options = {})

＆＃34;将数组转换为逗号分隔的句子，其中最后一个元素由连接词加入。＆＃34;

示例：

["Sugar", "Water", "Lemons", "Tea"].to_sentence # => "Sugar, Water, Lemons, and Tea"

你也可以传递选项，比如你的最后一个连接词：

["Sugar", "Water", "Lemons", "Tea"].to_sentence(last_word_connector: ' or ') # => "Sugar, Water, Lemons or Tea"

编辑：

正如Max Williams指出的那样，默认情况下会在最后一个单词旁边留下逗号。为避免这种情况，您可以明确声明" and "为最后一个单词连接符，因为默认值为", and "

["Sugar", "Water", "Lemons", "Tea"].to_sentence(last_word_connector: ' and ') # => "Sugar, Water, Lemons and Tea"

Answer 2

试试这个

pry(main)> ["Sugar", "Water", "Lemons", "Tea"].to_sentence
=> "Sugar, Water, Lemons, and Tea"

或

 pry(main)> ["Sugar", "Water", "Lemons", "Tea"].to_sentence(words_connector: ', ', last_word_connector: ' and ')
  => "Sugar, Water, Lemons and Tea"

Answer 3

您仍然可以使用join，只需单独执行最后一个元素。

def commas_with_and(arr)
  arr[0..-2].join(", ") << " and " << arr[-1]
end

arr = ["Sugar", "Water", "Lemons", "Tea"]
commas_with_and(arr)
>>  "Sugar, Water, Lemons and Tea"

Ruby - 来自一系列单词的英语句子列表

3 个答案: