Arrays 具有相似项的Ruby数组

我有两个数组

Device = ["Washington DC","Newyork","San Diego","Florida"]

Device1 = ["Washington DC","Newyork","San Diego","Florida"]

我这样做是为了从其中一个数组的元素中删除空格

Device.each do |x|
  x.gsub!(' ','')
  puts x
end

其他数组元素中的空格也已删除。当我对两个数组进行puts时，这就是我得到的结果

["WashingtonDC","Newyork","SanDiego","Florida"]
["WashingtonDC","Newyork","SanDiego","Florida"]

---

请告诉我我做错了什么，或者我应该怎么做，只从数组的一个元素中删除空格

很可能您的数组不包含不同的字符串，而是引用同一个字符串对象。修改一个事件时，将修改所有事件

string = "a reference"
array_1 = [string]
array_2 = [string]

array_1[0].gsub!(" ", "")

puts array_1 #> areference
puts array_2 #> areference

这是因为在两个数组中都有对同一字符串对象的引用，并且在原地修改它

puts array_1[0].object_id == array_2[0].object_id #> true

试试下面的方法，看看有什么不同

string_1 = "now it works"
array_1 = [string_1]
string_2 = "now it works"
array_2 =[string_2]

array_1[0].gsub!(" ", "")
puts array_1 #> nowitworks
puts array_2 #> now it works

您还可以创建一个新数组，并保留原始数组及其包含的对象不变：

array_1 = ["hey there"]
array_1_no_spaces = array_1.map do |string|
  string.gsub(" ", "") # just gsub, not gsub!
end

代码说明：请遵循最佳实践，并以小写形式命名变量：

device
list_of_something
...

CamelCase样式用于类：

class Device
end

如果已将相同的值分配给不同的变量，如下所示：

device = ["Washington DC","Newyork","San Diego","Florida"]
device1 = ["Washington DC","Newyork","San Diego","Florida"]

那么下面的代码肯定可以正常工作：

执行上述代码后，变量如下所示：

> device
#=> ["WashingtonDC", "Newyork", "SanDiego", "Florida"] 
> device1
#=> ["Washington DC", "Newyork", "San Diego", "Florida"]

但是

若通过变量为变量赋值，则每个变量包含相同的对象

> array = ["Washington DC","Newyork","San Diego","Florida"]
#=> ["Washington DC", "Newyork", "San Diego", "Florida"] 
> device = array
> device1 = array
> array.object_id
#=> 8031080 
> device.object_id
#=> 8031080 
> device1.object_id
#=> 8031080 

因此，当您对任何变量（如数组、设备或设备）执行任何操作1时，它将反映所有变量

您需要复制对象的副本。可以指定如下内容：

> array = ["Washington DC","Newyork","San Diego","Florida"]
> device = array.dup
> device1 = array.dup

> array.object_id
#=> 7077120 
> device.object_id
#=> 7005100 
> device1.object_id
#=> 6977660 

---

我希望现在这个简单的答案能让你明白易懂。

非常感谢它的有效性……也感谢你对最佳实践的建议我会注意的：这有什么错？您告诉我们，而不是我们告诉您。您可以使用delete“”代替gsub，请下次发布实际代码，因为提供的示例不会产生提供的结果。@engineersmnky当然。。谢谢

> array = ["Washington DC","Newyork","San Diego","Florida"]
> device = array.dup
> device1 = array.dup

> array.object_id
#=> 7077120 
> device.object_id
#=> 7005100 
> device1.object_id
#=> 6977660