ProgramGuruTo sort a hash by keys in Ruby, you can use the `sort.to_h` method, which returns a new hash with the keys sorted. This method provides a straightforward way to ensure the hash is sorted by keys.
We can sort a hash by keys in Ruby by using the `sort.to_h` method, which returns a new hash with the keys sorted.
For example,
unsorted_hash with some key-value pairs. In this example, the hash has string keys and integer values.sort.to_h method to create a new hash named sorted_hash that contains the same key-value pairs but with sorted keys.puts function to verify the sorting.unsorted_hash = { 'c' => 3, 'a' => 1, 'b' => 2 }
# Sort the hash by keys
sorted_hash = unsorted_hash.sort.to_h
# Print the sorted hash
puts 'Sorted Hash by Keys:'
sorted_hash.each { |key, value| puts "#{key}: #{value}" }Sorted Hash by Keys: a: 1 b: 2 c: 3
We can sort a hash by keys in descending order in Ruby by using the `sort_by.to_h` method with a custom comparator.
For example,
unsorted_hash with some key-value pairs. In this example, the hash has string keys and integer values.sort_by.to_h method with a custom comparator to create a new hash named sorted_hash that contains the same key-value pairs but with keys sorted in descending order.puts function to verify the sorting.unsorted_hash = { 'c' => 3, 'a' => 1, 'b' => 2 }
# Sort the hash by keys in descending order
sorted_hash = unsorted_hash.sort_by { |k, _v| -k.ord }.to_h
# Print the sorted hash
puts 'Sorted Hash by Keys (Descending):'
sorted_hash.each { |key, value| puts "#{key}: #{value}" }Sorted Hash by Keys (Descending): c: 3 b: 2 a: 1
We can sort a hash with numeric keys in Ruby by using the `sort.to_h` method, which returns a new hash with the keys sorted numerically.
For example,
unsorted_hash with some key-value pairs. In this example, the hash has integer keys and string values.sort.to_h method to create a new hash named sorted_hash that contains the same key-value pairs but with keys sorted numerically.puts function to verify the sorting.unsorted_hash = { 3 => 'three', 1 => 'one', 2 => 'two' }
# Sort the hash by numeric keys
sorted_hash = unsorted_hash.sort.to_h
# Print the sorted hash
puts 'Sorted Hash by Keys:'
sorted_hash.each { |key, value| puts "#{key}: #{value}" }Sorted Hash by Keys: 1: one 2: two 3: three
In this tutorial, we learned How to Sort a Map by Keys in Ruby language with well detailed examples.