method

transform_keys

v4.2.7 - Show latest stable - 0 notes - Class: Hash

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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
    return enum_for(:transform_keys) unless block_given?
    result = self.class.new
    each_key do |key|
      result[yield(key)] = self[key]
    end
    result
  end

transform_keys

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