Ruby新手：带5位数字的计数器

如何创建这样的计数器方法： 第一个：00001，第二个：00002 百分之一：00100等等？

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谢谢你

你的问题不是很具体。您的问题是什么，设置数字格式？如果是，可通过以下方式进行：

>> "%05d" % 5 #=> "00005"

对于整个范围，您可以在其上映射：

>> (1..10).map { |i| "%05d" % i } 
#=> ["00001", "00002", "00003", "00004", "00005", "00006", "00007", "00008", "00009", "00010"]

您还可以创建具有以下默认值的数组：

>> counter = Array.new(10) { |i| "%05d" % i } 
#=> ["00000", "00001", "00002", "00003", "00004", "00005", "00006", "00007", "00008", "00009"]

>> counter[1] #=> "00001"

然后像这样访问它们：

>> counter = Array.new(10) { |i| "%05d" % i } 
#=> ["00000", "00001", "00002", "00003", "00004", "00005", "00006", "00007", "00008", "00009"]

>> counter[1] #=> "00001"

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你的问题不是很具体。您的问题是什么，设置数字格式？如果是，可通过以下方式进行：

>> "%05d" % 5 #=> "00005"

对于整个范围，您可以在其上映射：

>> (1..10).map { |i| "%05d" % i } 
#=> ["00001", "00002", "00003", "00004", "00005", "00006", "00007", "00008", "00009", "00010"]

您还可以创建具有以下默认值的数组：

>> counter = Array.new(10) { |i| "%05d" % i } 
#=> ["00000", "00001", "00002", "00003", "00004", "00005", "00006", "00007", "00008", "00009"]

>> counter[1] #=> "00001"

然后像这样访问它们：

>> counter = Array.new(10) { |i| "%05d" % i } 
#=> ["00000", "00001", "00002", "00003", "00004", "00005", "00006", "00007", "00008", "00009"]

>> counter[1] #=> "00001"