class Hash
Public Instance Methods
Return all combinations of a hash.
Example:
{ :a => [1, 2] :b => [1, 2] }.combinations #=> [{:a=>1, :b=>1}, {:a=>1, :b=>2}, {:a=>2, :b=>1}, {:a=>2, :b=>2}]
# File lib/tr8n/extensions/hash_extension.rb, line 34 def combinations return [{}] if empty? copy = dup values = copy.delete(key = keys.first) result = [] copy.combinations.each do |tail| values.each do |value| result << tail.merge(key=>value) end end result end
Recursive version of Hash#merge
Compared with Hash#merge!, this method supports nested hashes. When both hsh
and other_hash
contains an entry with the same key, it merges and returns the values from both arrays.
Compared with Hash#merge, this method provides a different approch for merging nasted hashes. If the value of a given key is an Hash
and both other_hash
abd +hsh includes the same key, the value is merged instead replaced with other_hash
value.
h1 = {"a" => 100, "b" => 200, "c" => {"c1" => 12, "c2" => 14}} h2 = {"b" => 254, "c" => 300, "c" => {"c1" => 16, "c3" => 94}} h1.rmerge(h2) #=> {"a" => 100, "b" => 254, "c" => {"c1" => 16, "c2" => 14, "c3" => 94}}
Simply using Hash#merge would return
h1.merge(h2) #=> {"a" => 100, "b" = >254, "c" => {"c1" => 16, "c3" => 94}}
# File lib/tr8n/extensions/hash_extension.rb, line 119 def rmerge(other_hash) r = {} merge(other_hash) do |key, oldval, newval| r[key] = oldval.class == self.class ? oldval.rmerge(newval) : newval end end
Recursive version of Hash#merge!
Adds the contents of other_hash
to hsh
, merging entries in hsh
with duplicate keys with those from other_hash
.
Compared with Hash#merge!, this method supports nested hashes. When both hsh
and other_hash
contains an entry with the same key, it merges and returns the values from both arrays.
h1 = {"a" => 100, "b" => 200, "c" => {"c1" => 12, "c2" => 14}} h2 = {"b" => 254, "c" => 300, "c" => {"c1" => 16, "c3" => 94}} h1.rmerge!(h2) #=> {"a" => 100, "b" => 254, "c" => {"c1" => 16, "c2" => 14, "c3" => 94}}
Simply using Hash#merge! would return
h1.merge!(h2) #=> {"a" => 100, "b" = >254, "c" => {"c1" => 16, "c3" => 94}}
# File lib/tr8n/extensions/hash_extension.rb, line 92 def rmerge!(other_hash) merge!(other_hash) do |key, oldval, newval| oldval.class == self.class ? oldval.rmerge!(newval) : newval end end
# File lib/tr8n/extensions/hash_extension.rb, line 50 def tr8n_translated return self if frozen? @tr8n_translated = true self end
# File lib/tr8n/extensions/hash_extension.rb, line 56 def tr8n_translated? @tr8n_translated end