Compare two Ruby hashes and return that doesn't match

hash_diff.rb

def hash_diff(hash1, hash2)
  diff = {}

  # Check for keys and values present in hash1 but not in hash2
  hash1.each do |key, value|
    diff[key] = [value, hash2[key]] unless hash2[key] == value
  end

  # Check for keys and values present in hash2 but not in hash1
  hash2.each do |key, value|
    diff[key] = [hash1[key], value] unless hash1[key] == value
  end

  diff
end