method

transform_keys

v4.1.8 - Show latest stable - 0 notes - Class: Hash

1.0.0
1.1.6
1.2.6
2.0.3
2.1.0
2.2.1
2.3.8
3.0.0
3.0.9
3.1.0
3.2.1
3.2.8
3.2.13
4.0.2 (0)
4.1.8 (-1)
4.2.1 (0)
4.2.7 (0)
4.2.9 (0)
5.0.0.1 (19)
5.1.7 (0)
5.2.3 (0)
6.0.0
6.1.3.1
6.1.7.7
7.0.0
7.1.3.2
7.1.3.4
What's this?

transform_keys() public

Returns a new hash with all keys converted using the block operation.

hash = { name: 'Rob', age: '28' }

hash.transform_keys{ |key| key.to_s.upcase }
# => {"NAME"=>"Rob", "AGE"=>"28"}

Show source

# File activesupport/lib/active_support/core_ext/hash/keys.rb, line 8
  def transform_keys
    result = {}
    each_key do |key|
      result[yield(key)] = self[key]
    end
    result
  end

transform_keys

Related methods