diff options
| -rw-r--r-- | activesupport/lib/active_support/core_ext/hash/reverse_merge.rb | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/activesupport/lib/active_support/core_ext/hash/reverse_merge.rb b/activesupport/lib/active_support/core_ext/hash/reverse_merge.rb index afa421c1ec..ce9cf0ab9f 100644 --- a/activesupport/lib/active_support/core_ext/hash/reverse_merge.rb +++ b/activesupport/lib/active_support/core_ext/hash/reverse_merge.rb @@ -1,21 +1,28 @@ module ActiveSupport #:nodoc: module CoreExtensions #:nodoc: module Hash #:nodoc: - # Allows for reverse merging where the keys in the calling hash take precedence over those in the <tt>other_hash</tt>. - # This is particularly useful for initializing an option hash with default values: + # Allows for reverse merging two hashes where the keys in the calling hash take precedence over those + # in the <tt>other_hash</tt>. This is particularly useful for initializing an option hash with default values: # # def setup(options = {}) # options.reverse_merge! :size => 25, :velocity => 10 # end # - # The default <tt>:size</tt> and <tt>:velocity</tt> is only set if the +options+ passed in doesn't already have those keys. + # Using <tt>merge</tt>, the above example would look as follows: + # + # def setup(options = {}) + # { :size => 25, :velocity => 10 }.merge(options) + # end + # + # The default <tt>:size</tt> and <tt>:velocity</tt> are only set if the +options+ hash passed in doesn't already + # have the respective key. module ReverseMerge - # Performs the opposite of merge, with the keys and values from the first hash taking precedence over the second. + # Performs the opposite of <tt>merge</tt>, with the keys and values from the first hash taking precedence over the second. def reverse_merge(other_hash) other_hash.merge(self) end - # Performs the opposite of merge, with the keys and values from the first hash taking precedence over the second. + # Performs the opposite of <tt>merge</tt>, with the keys and values from the first hash taking precedence over the second. # Modifies the receiver in place. def reverse_merge!(other_hash) replace(reverse_merge(other_hash)) |