instance method `transform_keys`

Ruby on Rails 5.2.8.1

Since v4.0.13 Last seen in v5.2.8.1

Available in: v4.0.13 v4.1.16 v4.2.9 v5.2.8.1

Compare with:

transform_keys()

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"}

If you do not provide a block, it will return an Enumerator for chaining with other methods:

hash.transform_keys.with_index { |k, i| [k, i].join } # => {"name0"=>"Rob", "age1"=>"28"}

Source

# File activesupport/lib/active_support/core_ext/hash/keys.rb, line 14
  def transform_keys
    return enum_for(:transform_keys) { size } unless block_given?
    result = {}
    each_key do |key|
      result[yield(key)] = self[key]
    end
    result
  end

Defined in activesupport/lib/active_support/core_ext/hash/keys.rb line 14 · View on GitHub · Improve this page · Find usages on GitHub

Defined in Hash

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