Returns a random key.
{:one => 1, :two => 2, :three => 3}.pick_key #=> :three
# File lib/more/facets/random.rb, line 258 258: def rand_key 259: keys.at(Random.number(keys.size)) 260: 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 268 268: def rand_key! 269: k,v = rand_pair 270: delete(k) 271: return k 272: end
Returns a random key-value pair.
{:one => 1, :two => 2, :three => 3}.pick #=> [:one, 1]
# File lib/more/facets/random.rb, line 280 280: def rand_pair 281: k = rand_key 282: return k, fetch(k) 283: 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 291 291: def rand_pair! 292: k,v = rand_pair 293: delete( k ) 294: return k,v 295: 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 304 304: def rand_value 305: fetch(rand_key) 306: 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 314 314: def rand_value! 315: k,v = rand_pair 316: delete( k ) 317: return v 318: 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 331 331: def shuffle 332: ::Hash.zipnew( keys.sort_by{Random.number}, values.sort_by{Random.number} ) 333: end
Disabled; run with --debug to generate this.
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