module Gorillib::Hashlike::ReverseMerge

Public Instance Methods

reverse_merge(other_hash) click to toggle source

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.

# File lib/gorillib/hashlike/reverse_merge.rb, line 19
def reverse_merge(other_hash)
  other_hash.merge(self)
end
reverse_merge!(other_hash) click to toggle source

Performs the opposite of merge, with the keys and values from the first hash taking precedence over the second. Modifies the receiver in place.

# File lib/gorillib/hashlike/reverse_merge.rb, line 25
def reverse_merge!(other_hash)
  merge!( other_hash ){|k,o,n| o }
end