Sha256: 08d238cb075eb9e76cf11a8bbb832c309fae62fe4fd2c906461b0a02f78da0b8
Contents?: true
Size: 856 Bytes
Versions: 22
Compression:
Stored size: 856 Bytes
Contents
require 'facet/hash/rand_key'
class Hash
# Returns a random key-value pair.
#
# {:one => 1, :two => 2, :three => 3}.pick #=> [:one, 1]
#
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}
#
def rand_pair!
k,v = rand_pair
delete( k )
return k,v
end
alias_method( :pick_pair, :rand_pair! )
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCHash < Test::Unit::TestCase
def test_rand_pair
h = { :a=>1, :b=>2, :c=>3 }
10.times { k,v = *h.rand_pair; assert_equal( v, h[k] ) }
end
end
=end
Version data entries
22 entries across 22 versions & 1 rubygems