Sha256: 142a58087f2f91cb4e3bcdbc9ada92d6ba5273b1f9090bc844e2f318406d39d5
Contents?: true
Size: 784 Bytes
Versions: 26
Compression:
Stored size: 784 Bytes
Contents
class Hash
# Returns a random key.
#
# {:one => 1, :two => 2, :three => 3}.pick_key #=> :three
#
def rand_key
keys.at( rand(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}
#
def rand_key!
k,v = rand_pair
delete( k )
return k
end
alias_method( :pick_key, :rand_key! )
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCHash < Test::Unit::TestCase
def test_rand_key
h = { :a=>1, :b=>2, :c=>3 }
10.times { assert( h.keys.include?( h.rand_key ) ) }
end
end
=end
Version data entries
26 entries across 26 versions & 1 rubygems