IvikGH/ruby_tasks.rb

## ruby_tasks.rb
# Sort by frequency
def frequency(arr)
  arr.each_with_object(Hash.new(0)) { |letter, result| result[letter] += 1 }
     .sort_by { |_k, v| -v }.to_h.keys
end

# Flatten a list
def flatten(arr)
  arr.flatten!
end
	# Sort by frequency
	def frequency(arr)
	arr.each_with_object(Hash.new(0)) { \|letter, result\| result[letter] += 1 }
	.sort_by { \|_k, v\| -v }.to_h.keys
	end

	# Flatten a list
	def flatten(arr)
	arr.flatten!
	end