class Hash

# File lib/core/ext/hash.rb, line 2
def deep_merge(other_hash, &block)
  dup.deep_merge!(other_hash)
end

# File lib/core/ext/hash.rb, line 6
def deep_merge!(other_hash, &block)
  merge!(other_hash) do |key, this_val, other_val|
    if this_val.is_a?(Hash) && other_val.is_a?(Hash)
      this_val.deep_merge(other_val, &block)
    elsif block_given?
      block.call(key, this_val, other_val)
    else
      other_val
    end
  end
end

# File lib/core/ext/hash.rb, line 24
def except(*less_keys)
  slice(*keys - less_keys)
end

# File lib/core/ext/hash.rb, line 18
def slice(*keep_keys)
  h                                              = {}
  keep_keys.each { |key| has_key?(key) && h[key] = fetch(key, nil) }
  h
end