class Hash
Public Instance Methods
Gathers all keys in the hash in a flat array, even if it's multi-level
E.g. from {:a => :b, :c => {:d => :e}}, returns [:a, :c, :d]
# File lib/more_ruby/hash.rb, line 24 def all_keys list = [] self.each_pair do |k, v| case k when Hash list += k.all_keys when Array if k[0].class == Hash # if the array contains hashes k.each do |array_item| list += array_item.all_keys end else list << k end else list << k end # end case k case v when Hash list += v.all_keys when Array if v[0].class == Hash # if the array contains hashes v.each do |array_item| list += array_item.all_keys end else # do nothing end else # do nothing end # end case v end list end
Gathers all values in the hash in a flat array, even if it's multi-level
E.g. from {:a => :b, :c => {:d => :e}}, returns [:b, :e]
# File lib/more_ruby/hash.rb, line 62 def all_values list = [] self.each_pair do |k, v| case k when Hash list += k.all_values when Array if k[0].class == Hash # if the array contains hashes k.each do |array_item| list += array_item.all_values end else # do nothing end else # do nothing end # end case k case v when Hash list += v.all_values when Array if v[0].class == Hash # if the array contains hashes v.each do |array_item| list += array_item.all_values end else list << v end else list << v end # end case v end list end
# File lib/more_ruby/hash.rb, line 18 def delete_random delete(self.random_key) end
A prettier way of printing a hash Want to p each pair, but have each p appear on a new line in STDOUT
# File lib/more_ruby/hash.rb, line 113 def peach self.each_pair { |k, v| puts "#{k.inspect} => #{v.inspect}" } end
# File lib/more_ruby/hash.rb, line 8 def random_key self.keys.random end
Returns a hash of the key and value
# File lib/more_ruby/hash.rb, line 13 def random_pair key = random_key {key => self[key]} end
# File lib/more_ruby/hash.rb, line 4 def random_value self.values.random end
Recursively deletes keys from the hash if the value of that field is nil or empty
# File lib/more_ruby/hash.rb, line 118 def remove_empty_fields self.each_pair do |k, v| if self[k].class == Hash self[k] = self[k].remove_empty_fields else self.delete(k) if v.to_s == "" end end self end
Sorts the hash by its keys. This way, if two versions of the hash (mhich are identical but their k-v pairs are in different order) are both sorted then converted to string (to_s) they will be identical. Assumes that all of the keys in the hash are symbol/string/numeric and are not Hash
, Array
, etc. Assumes that each key in the hash is unique Sorts deep, not shallow Returns a new hash; does not modify self
# File lib/more_ruby/hash.rb, line 175 def sort_deep new = {} keys = self.keys.sort keys.each do |main_key| self.each_pair do |k, v| next unless k == main_key if v.class == Hash new[k] = v.sort_deep else new[k] = v end end end new end
Method to convert all values to strings, for all layers within the hash
# File lib/more_ruby/hash.rb, line 99 def stringify_all_values_deep self.each_pair do |k, v| case v when Array, Hash v = v.stringify_all_values_deep else self[k] = v.to_s end end self end
Method to strip from the hash (and all sub-hashes) all keys matching the entries in the supplied array Entries in the array can be strings or other literals, or regexes Directly deletes from self; returns the modified self
# File lib/more_ruby/hash.rb, line 132 def strip_hash_of_keys(array_of_keys_to_strip) self.keys.each do |k| strip = false array_of_keys_to_strip.each do |i| if i.class == Regexp strip = true if k =~ i else strip = true if k == i end end if strip self.delete(k) else if self[k].class == Hash self[k] = self[k].strip_hash_of_keys(array_of_keys_to_strip) elsif self[k].class == Array self[k].each do |h| h = h.strip_hash_of_keys(array_of_keys_to_strip) if h.class == Hash end end end end self end
Method to fully convert the hash into an array, including all sub-hashes to_a only converts the base level
# File lib/more_ruby/hash.rb, line 160 def to_a_deep self.keys.each do |k| if self[k].class == Hash self[k] = self[k].to_a_deep end end self.to_a end
# File lib/more_ruby/hash.rb, line 191 def to_xml map do |k, v| if v.class == Hash text = v.to_xml else text = v end "<%s>%s</%s>" % [k, text, k] end.join end