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Contents
#--
# Adapted from rand.rb by:
# * Ilmari Heikkinen <mailto:kig@misfiring.net>
# * Christian Neukirchen <mailto:chneukirchen@gmail.com>
#++
require 'facet/hash/rand_key'
class Hash
# Returns a random hash value.
#
# {:one => 1, :two => 2, :three => 3}.rand_value #=> 2
# {:one => 1, :two => 2, :three => 3}.rand_value #=> 1
#
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}
#
def rand_value!
k,v = rand_pair
delete( k )
return v
end
alias_method( :pick, :rand_value! )
alias_method( :at_rand, :rand_value )
alias_method( :at_rand!, :rand_value! )
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCHash < Test::Unit::TestCase
def test_rand_value
h = { :a=>1, :b=>2, :c=>3 }
10.times { assert( h.values.include?( h.rand_value ) ) }
end
end
=end
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22 entries across 22 versions & 1 rubygems