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| -rw-r--r-- | guides/source/active_support_core_extensions.md | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/guides/source/active_support_core_extensions.md b/guides/source/active_support_core_extensions.md index 5ed392d43d..08b46c62eb 100644 --- a/guides/source/active_support_core_extensions.md +++ b/guides/source/active_support_core_extensions.md @@ -2862,6 +2862,20 @@ Active Record does not accept unknown options when building associations, for ex NOTE: Defined in `active_support/core_ext/hash/keys.rb`. +### Transform Values + +#### `transform_values` && `transform_values!` + +The method `transform_values` accepts a block and returns a hash that has applied the block operations to each of the values in the receiver + +```ruby +{nil => nil, 1 => 1, a: :a}.transform_values { |value| value.to_s.upcase } +# => {nil => "", 1 => "1", :a=> "A"} +``` +There's also the bang variant `transform_values!` that applies the block operations to values in the very receiver. + +NOTE: Defined in `active_support/core_text/hash/transform_values.rb` + ### Slicing Ruby has built-in support for taking slices out of strings and arrays. Active Support extends slicing to hashes: |