Module: Fusu::Hash::DeepMerge

Included in:
Fusu::Hash
Defined in:
lib/fusu/hash/deep_merge.rb

Instance Method Summary collapse

Instance Method Details

#deep_merge(hash, other_hash, &block) ⇒ Object

Returns a new hash with self and other_hash merged recursively.

h1 = { a: true, b: { c: [1, 2, 3] } }
h2 = { a: false, b: { x: [3, 4, 5] } }

Fusu::Hash.deep_merge(h1, h2) # => { a: false, b: { c: [1, 2, 3], x: [3, 4, 5] } }

Like with Hash#merge in the standard library, a block can be provided to merge values:

h1 = { a: 100, b: 200, c: { c1: 100 } }
h2 = { b: 250, c: { c1: 200 } }
Fusu::Hash.deep_merge(h1, h2) { |key, this_val, other_val| this_val + other_val }
# => { a: 100, b: 450, c: { c1: 300 } }



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# File 'lib/fusu/hash/deep_merge.rb', line 19

def deep_merge(hash, other_hash, &block)
  deep_merge!(hash.dup, other_hash, &block)
end

#deep_merge!(hash, other_hash, &block) ⇒ Object

Same as deep_merge, but modifies self.



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# File 'lib/fusu/hash/deep_merge.rb', line 24

def deep_merge!(hash, other_hash, &block)
  hash.merge!(other_hash) do |key, this_val, other_val|
    if this_val.class <= ::Hash && other_val.class <= ::Hash
      deep_merge(this_val, other_val, &block)
    elsif block_given?
      block.call(key, this_val, other_val)
    else
      other_val
    end
  end
end