试图在Ruby中按字母顺序排列

Question

转动此字符串：

"The quick brown fox jumps over the lazy dog"

进入这个字符串：

"abcdefghijklmnopqrstuvwxyz"

这完全适用于Ruby。任何帮助都会很棒。

Answer 1

编辑：因为速度并不总是更好

"The quick brown fox jumps over the lazy dog".downcase.chars.uniq.sort.join.strip

Answer 2

text = "The quick brown fox jumps over the lazy dog"
text.chars.sort.join
 => "        Tabcdeeefghhijklmnoooopqrrstuuvwxyz" 

或不区分大小写：

str.chars.sort(&:casecmp).join

Answer 3

str = "The quick brown fox jumps over the lazy dog"
str.scan(/[a-z]/).uniq.sort.join #=> "abcdefghijklmnopqrstuvwxyz"

步骤

str.scan(/[a-z]/) #returns all lowercase letters
str.scan(/[a-z]/).uniq #gets rid of duplicates
str.scan(/[a-z]/).uniq.sort #sorts in alphabetical order
str.scan(/[a-z]/).uniq.sort.join #makes a string

或另一种方式：

str.scan(/[a-z]/).sort.join.squeeze #=> "abcdefghijklmnopqrstuvwxyz"

步骤

str.scan(/[a-z]/) #returns all lowercase letters
str.scan(/[a-z]/).sort #sorts in alphabetical order
str.scan(/[a-z]/).sort.join #makes a string
str.scan(/[a-z]/).sort.join.squeeze #gets rid of duplicates

Answer 4

更快的解决方案很重要，但却显示出优雅：

str, hash = "This is cat", {}
str.each_char { |c| hash[c.downcase] = 1 }
('a'..'z').inject("") { |s, c| hash[c] ? s+c : s }