How to Sort Hash in Ruby

In this article, you will learn how to sort hash in Ruby.

Sorting hash in Ruby

In Ruby, hashes are unordered collections of key-value pairs. However, you can sort the keys or values of a hash in different ways. Here are some ways to sort a hash in Ruby:

Sorting by key

hash = { "b" => 3, "a" => 1, "c" => 2 }
sorted_hash = hash.sort.to_h
# => {"a"=>1, "b"=>3, "c"=>2}

In this example, the sort method is called on the hash, which returns an array of key-value pairs sorted by key. The to_h method is called on the resulting array to convert it back to a hash.

Sorting by value

hash = { "b" => 3, "a" => 1, "c" => 2 }
sorted_hash = hash.sort_by { |k, v| v }.to_h
# => {"a"=>1, "c"=>2, "b"=>3}

In this example, the sort_by method is called on the hash with a block that sorts the key-value pairs by value. The resulting array is converted back to a hash using the to_h method.

Sorting by both key and value

hash = { "b" => 3, "a" => 1, "c" => 2 }
sorted_hash = hash.sort_by { |k, v| [k, v] }.to_h
# => {"a"=>1, "b"=>3, "c"=>2}

In this example, the sort_by method is called on the hash with a block that sorts the key-value pairs by an array of key and value. The resulting array is converted back to a hash using the to_h method.