Ruby sorts Hash by key

Of course, Hash in Ruby is similar to a set. There is no so-called order. By default, they are arranged in the order of data insertion. But you must have had such a requirement: how to rearrange the hashes in Ruby according to the order of the keys to get a new hash? Let me show you it below!

[5] pry(main)> temp = {}
=> {}
[6] pry(main)> temp["ninjas"]=36
=> 36
[7] pry(main)> temp["pirates"]=12
=> 12
[8] pry(main)> temp["cheese"]=222
=> 222
[9] pry(main)> temp
=> {"ninjas"=>36, "pirates"=>12, "cheese"=>222}

[10] pry(main)> temp.sort_by { |key, val| key }
=> [["cheese", 222], ["ninjas", 36], ["pirates", 12]]
[11] pry(main)> temp.sort_by { |key, val| key }.to_h
=> {"cheese"=>222, "ninjas"=>36, "pirates"=>12}

[12] pry(main)> temp.sort.to_h
=> {"cheese"=>222, "ninjas"=>36, "pirates"=>12}

Friendly reminder: If your Hash is very large, and your need for sorting is not very strong, it is not recommended to toss it (resource consumption and time waste will be very serious).