Returns a random key.
{:one => 1, :two => 2, :three => 3}.pick_key #=> :three
# File lib/more/facets/random.rb, line 242 def rand_key keys.at(Random.number(keys.size)) end
Delete a random key-value pair, returning the key.
a = {:one => 1, :two => 2, :three => 3} a.pick_key! #=> :two a #=> {:one => 1, :three => 3}
# File lib/more/facets/random.rb, line 252 def rand_key! k,v = rand_pair delete(k) return k end
Returns a random key-value pair.
{:one => 1, :two => 2, :three => 3}.pick #=> [:one, 1]
# File lib/more/facets/random.rb, line 264 def rand_pair k = rand_key return k, fetch(k) end
Deletes a random key-value pair and returns that pair.
a = {:one => 1, :two => 2, :three => 3} a.rand_pair! #=> [:two, 2] a #=> {:one => 1, :three => 3}
# File lib/more/facets/random.rb, line 275 def rand_pair! k,v = rand_pair delete( k ) return k,v end
Returns a random hash value.
{:one => 1, :two => 2, :three => 3}.rand_value #=> 2 {:one => 1, :two => 2, :three => 3}.rand_value #=> 1
# File lib/more/facets/random.rb, line 288 def rand_value fetch(rand_key) end
Deletes a random key-value pair and returns the value.
a = {:one => 1, :two => 2, :three => 3} a.at_rand! #=> 2 a #=> {:one => 1, :three => 3}
# File lib/more/facets/random.rb, line 298 def rand_value! k,v = rand_pair delete( k ) return v end
Returns a copy of the hash with values arranged in new random order.
h = {:a=>1, :b=>2, :c=>3} h.shuffle_hash #=> {:b=>2, :c=>1, :a>3}
# File lib/more/facets/random.rb, line 315 def shuffle ::Hash.zipnew( keys.sort_by{Random.number}, values.sort_by{Random.number} ) end
Destructive shuffle_hash. Arrange the values in a new random order.
h = {:a => 1, :b => 2, :c => 3} h.shuffle_hash! h #=> {:b=>2, :c=>1, :a=>3}
# File lib/more/facets/random.rb, line 326 def shuffle! self.replace(shuffle) end