如何按长度对Ruby字符串数组进行排序？

Question

我如何排序：

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

进入这个？

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

您还可以使用sort：

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

Answer 3

arr = arr.sort{|x,y| x.length - y.length}也有效。