如何按長度排序字符串的Ruby數組？

Question

我怎麼排序的：

arr = ["aaa","aa","aaaa","a","aaaaa"]; 

進入這個？

arr = ["a","aa","aaa","aaaa","aaaaa"]; 

Answer 1

arr = arr.sort_by {|x| x.length} 

或者在1.8.7+：

arr = arr.sort_by(&:length) 

Answer 2

您還可以使用sort：

arr.sort{|x, y| x.length <=> y.length} 

Answer 3

arr = arr.sort{|x,y| x.length - y.length}工作過。