module Jekyll::Algolia::Utils

the output
value. If not, it remember what was the value of beta and return it in
It only checks that all keys of alpha are also in beta, with the same

Public: Get a hash representing the difference between two hashes

def self.diff_keys(alpha, beta)
  diff = {}
  alpha.each do |key, value|
    diff[key] = beta[key] if beta[key] != value
  end
  return nil if diff.empty?
  diff
end