class Hash

Public Instance Methods

combinations() click to toggle source

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
rmerge(other_hash) click to toggle source

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
rmerge!(other_hash) click to toggle source

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
tr8n_translated() click to toggle source
# File lib/tr8n/extensions/hash_extension.rb, line 50
def tr8n_translated
  return self if frozen?
  @tr8n_translated = true
  self
end
tr8n_translated?() click to toggle source
# File lib/tr8n/extensions/hash_extension.rb, line 56
def tr8n_translated?
  @tr8n_translated
end