Question

Ruby noob在这里。我在ruby脚本中有多个数组，我想追加创建一个带有键值对的字符串，其中id数组的每个值都匹配id_desc数组的等效值，如下所示：

ids = [1234, 2345, 3456]
ids_desc = ["inst1", "inst2", "inst3"]

如何完全按照上述数组中的说明构建以下字符串：

"The key for id '#{id}' has a value of '#{id_desc}'"

应输出：

"The key for id '1234' has a value of 'inst1'"
"The key for id '2345' has a value of 'inst2'"
etc.

我可以很容易地做到以下几点：

str1 = Array.new
ids.each do |id|
 str1 << "The key for id '#{id}'"
end

但是，我无法确定如何在每个键映射的末尾添加“具有＃{id_desc}值”。有人有什么建议吗？

谢谢！

Answer 1

如果ids和ids长度相同，您可以压缩ids_desc数组：

ids.zip(ids_desc).each do |id, desc|
  str1 << "The key for id #{id} has a value of #{desc}"
end

或者只使用Enumerable#each_with_index：

ids.each_with_index do |id, i|
  str1 << "The key for id #{id} has a value of #{ids_desc[i]}"
end

您可以使用str1

来避免创建Array#map数组

ids.zip(ids_desc).map do |id, desc|
  "The key for id #{id} has a value of #{desc}"
end

Answer 2

收集字符串

ids = [1234, 2345, 3456]
ids_desc = ["inst1", "inst2", "inst3"]
array = ids.zip(ids_desc).map { |e| "The key for id '%d' has a value of '%s'" % e }

将集合打印到标准输出

array.map { |e| puts e }

id＆＃39; 1234＆＃39;的关键的值为＆＃39; inst1＆＃39;
  id＆＃23; 2345＆＃39;的值为＆＃39; inst2＆＃39;
  id＆＃39; 3456＆＃39;的关键值为＆＃39; inst3＆＃39;