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This chapter is from the book

This chapter is from the book

Sorting a Hash by Key or Value

Hashes are unsorted objects because of the way in which they are stored internally. If you want to access a Hash in a sorted manner by key, you need to use an Array as an indexing mechanism as is shown above.

You can also use the Hash#sort method to get a new sorted Array of pairs:

    #=> [["a", "1"], ["b", "2"], ["c", "3"]]

You can do the same by value, but it’s a little more complicated:

my_hash.keys.sort_by { |key| my_hash[key] }.each do
    puts my_hash[key]

Or, you can use the Hash#sort method for values:

my_hash.sort { |l, r| l[1]<=>r[1] }
    #=> [["a", "1"], ["b", "2"], ["c", "3"]]

This works by using the Emmuerator#sort_by method that is mixed into the Array of keys. #sort_by looks at the value my_hash[key] returns to determine the sorting order.

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