module ImageOptim::HashHelpers

Helper methods to manipulate Hash, mainly used in config

Public Class Methods

deep_merge(a, b) click to toggle source

Returns a new hash with recursive merge of all keys

# File lib/image_optim/hash_helpers.rb, line 18
def deep_merge(a, b)
  a.merge(b) do |_k, v_a, v_b|
    if v_a.is_a?(Hash) && v_b.is_a?(Hash)
      deep_merge(v_a, v_b)
    else
      v_b
    end
  end
end
deep_stringify_keys(hash) click to toggle source

Returns a new hash with all keys of root and nested hashes converted to strings

# File lib/image_optim/hash_helpers.rb, line 7
def deep_stringify_keys(hash)
  deep_transform_keys(hash, &:to_s)
end
deep_symbolise_keys(hash) click to toggle source

Returns a new hash with all keys of root and nested hashes converted to symbols

# File lib/image_optim/hash_helpers.rb, line 13
def deep_symbolise_keys(hash)
  deep_transform_keys(hash, &:to_sym)
end

Private Class Methods

deep_transform_keys(hash, &block) click to toggle source

Returns a new hash with all keys of root and nested hashes converted by provided block

# File lib/image_optim/hash_helpers.rb, line 32
def deep_transform_keys(hash, &block)
  new_hash = {}
  hash.each do |k, v|
    new_hash[block.call(k)] = if v.is_a?(Hash)
      deep_transform_keys(v, &block)
    else
      v
    end
  end
  new_hash
end