instance method `reverse_merge`

Ruby on Rails 3.0.20

Since v3.0.20

Available in: v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

reverse_merge(other_hash)

Allows for reverse merging two hashes where the keys in the calling hash take precedence over those in the other_hash. This is particularly useful for initializing an option hash with default values:

def setup(options = {})
  options.reverse_merge! :size => 25, :velocity => 10
end

Using merge, the above example would look as follows:

def setup(options = {})
  { :size => 25, :velocity => 10 }.merge(options)
end

The default :size and :velocity are only set if the options hash passed in doesn’t already have the respective key.

Parameters

other_hash req

Source

# File activesupport/lib/active_support/core_ext/hash/reverse_merge.rb, line 17
  def reverse_merge(other_hash)
    other_hash.merge(self)
  end

Defined in activesupport/lib/active_support/core_ext/hash/reverse_merge.rb line 17 · View on GitHub · Improve this page · Find usages on GitHub

Defined in Hash

Signature

Parameters