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sorting - How do I sort a Ruby array of strings by length?

How do I sort this:

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

Into this?

arr = ["a","aa","aaa","aaaa","aaaaa"];
question from:https://stackoverflow.com/questions/3172224/how-do-i-sort-a-ruby-array-of-strings-by-length

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

Or in 1.8.7+:

arr = arr.sort_by(&:length)

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