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Contents
class Array
# Similar to #at_rand, but will return an array of randomly
# picked exclusive elements if given a number.
def pick(n=nil)
if n
a = self.dup
a.pick!(n)
else
at( Kernel.rand( size ) )
end
end
# Similar to #at_rand!, but given a number will return
# an array of exclusive elements.
def pick!(n=nil)
if n
if n > self.size
r = self.dup
self.replace([])
r
else
r = []
n.times { r << delete_at( Kernel.rand( size ) ) }
r
end
else
delete_at( Kernel.rand( size ) )
end
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCArray < Test::Unit::TestCase
def test_pick
a = ['a','b','c']
assert_equal( 3, a.pick(3).length )
assert_equal( 3, a.length )
a = ['a','b','c']
assert_equal( 3, a.pick(4).length )
assert_equal( 3, a.length )
end
def test_pick!
a = ['a','b','c']
assert_equal( 3, a.pick!(3).length )
assert_equal( 0, a.length )
a = ['a','b','c']
assert_equal( 3, a.pick!(4).length )
assert_equal( 0, a.length )
end
end
=end
Version data entries
26 entries across 26 versions & 1 rubygems