ruby 如何按字母顺序对字符串的字符进行排序?
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How to sort a string's characters alphabetically?
提问by steveyang
For Array, there is a pretty sortmethod to rearrange the sequence of elements. I want to achieve the same results for a String.
对于 Array,有一个很好的sort方法来重新排列元素的序列。我想为字符串实现相同的结果。
For example, I have a string str = "String", I want to sort it alphabetically with one simple method to "ginrSt".
例如,我有一个字符串str = "String",我想用一种简单的方法按字母顺序对它进行排序"ginrSt"。
Is there a native way to enable this or should I include mixins from Enumerable?
是否有一种本地方式可以启用此功能,或者我应该包含来自 的mixinEnumerable吗?
回答by molf
The charsmethodreturns an enumeration of the string's characters.
该chars方法返回字符串字符的枚举。
str.chars.sort.join
#=> "Sginrt"
To sort case insensitively:
不区分大小写排序:
str.chars.sort(&:casecmp).join
#=> "ginrSt"
回答by fl00r
Also (just for fun)
还有(只是为了好玩)
str = "String"
str.chars.sort_by(&:downcase).join
#=> "ginrSt"
回答by user2386335
str.unpack("c*").sort.pack("c*")
回答by leandrotk
You can transform the string into an array to sort:
您可以将字符串转换为数组进行排序:
'string'.split('').sort.join

