[英]how to sort an array of strings and integers to show sorted integers first in ruby
I have an array containing integer values and string type characters as such _
我有一个包含整数值和字符串类型字符的数组,例如
_
Here is my array array = ["_", 2, 3, "_"]
how can I sort them such that it returns like the following: [2, 3, "_", "_"]
I have tried to sort it with the ruby .sort()
method but it appears as if sort()
does not compare integers with strings and therfore returns an error.这是我的数组
array = ["_", 2, 3, "_"]
我如何对它们进行排序,使其返回如下所示: [2, 3, "_", "_"]
我试图排序它使用 ruby .sort()
方法,但看起来sort()
不将整数与字符串进行比较,因此返回错误。
is there a ruby method I am not aware of?有没有我不知道的 ruby 方法? Any help or guidance is highly appreciated.
非常感谢任何帮助或指导。
The problem is you can't compare a string to an integer:问题是您无法将字符串与整数进行比较:
> 2<"2"
(irb):15:in `<': comparison of Integer with String failed (ArgumentError)
The fix (with your specific example) is to make array
act as if it is all strings.修复(使用您的特定示例)是使
array
表现得好像它是所有字符串。
Given:鉴于:
array = ["_", 2, 3, "_"]
If you just want the result to be a uniform string array:如果您只希望结果是一个统一的字符串数组:
> array.map{|e| e.to_s}.sort
=> ["2", "3", "_", "_"]
If you want the elements to maintain their type:如果您希望元素保持其类型:
> array.map{|e| [e.to_s, e]}.sort.map{|e| e[1]}
=> [2, 3, "_", "_"]
Or, alternatively:或者,或者:
> array.sort_by{|e| e.to_s}
=> [2, 3, "_", "_"]
The potential issue here is that if you rely solely on a conversion to a string (which solved the example you gave) you will get a bad result with integers:这里的潜在问题是,如果您仅依赖于字符串的转换(它解决了您给出的示例),您将得到整数的错误结果:
> array = ["10", 12, 3, "0", "b", "a"]
=> ["10", 12, 3, "0", "b", "a"]
> array.sort_by{|e| e.to_s}
=> ["0", "10", 12, 3, "a", "b"] # desirable?
Which is not entirely solvable by using .to_i
:使用
.to_i
不能完全解决:
> array.sort_by{|e| e.to_i}
=> ["0", "b", "a", 3, "10", 12] # fixed?
Which maybe is best solved by sorting on both:最好通过对两者进行排序来解决:
> array.sort_by{|e| [e.to_i, e.to_s]}
=> ["0", "a", "b", 3, "10", 12]
Luckily Ruby makes it super easy to choose.幸运的是,Ruby 使它非常容易选择。
Note, .sort_by
or the other enumerable sorts are not a stable sort so elements that compare equal are potentially returned in different order than given:请注意,
.sort_by
或其他 可枚举的排序不是稳定的排序,因此比较相等的元素可能以与给定顺序不同的顺序返回:
> array=[1,2,3,4,5,6,7,8,9]
=> [1, 2, 3, 4, 5, 6, 7, 8, 9]
> array.sort_by{|e| 0} # make them all compare equal
=> [9, 2, 3, 4, 5, 6, 7, 8, 1]
To fix that now, add an index:现在要解决这个问题,请添加一个索引:
> array.each_with_index.sort_by{|e,i| [0,i]}.map(&:first)
=> [1, 2, 3, 4, 5, 6, 7, 8, 9]
Or, as pointed out in comments:或者,正如评论中指出的那样:
> array.sort_by.with_index { |e, i| [0, i] }
=> [1, 2, 3, 4, 5, 6, 7, 8, 9]
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