module Random::Hash

Public Instance Methods

at_rand() click to toggle source
Alias for: rand_value
at_rand!() click to toggle source
Alias for: rand_value!
pick() click to toggle source
Alias for: rand_value!
pick_key() click to toggle source
Alias for: rand_key!
pick_pair() click to toggle source
Alias for: rand_pair!
rand_key() click to toggle source

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
rand_key!() click to toggle source

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
Also aliased as: pick_key
rand_pair() click to toggle source

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
rand_pair!() click to toggle source

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
Also aliased as: pick_pair
rand_value() click to toggle source

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
Also aliased as: at_rand
rand_value!() click to toggle source

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
Also aliased as: pick, at_rand!
shuffle() click to toggle source

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
shuffle!() click to toggle source

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