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class Array
# call-seq:
# array.shuffle!(random: Random) -> array
#
# Shuffles the elements of +self+ in place.
# a = [1, 2, 3] #=> [1, 2, 3]
# a.shuffle! #=> [2, 3, 1]
# a #=> [2, 3, 1]
#
# The optional +random+ argument will be used as the random number generator:
# a.shuffle!(random: Random.new(1)) #=> [1, 3, 2]
def shuffle!(random: Random)
Primitive.rb_ary_shuffle_bang(random)
end
# call-seq:
# array.shuffle(random: Random) -> new_ary
#
# Returns a new array with elements of +self+ shuffled.
# a = [1, 2, 3] #=> [1, 2, 3]
# a.shuffle #=> [2, 3, 1]
# a #=> [1, 2, 3]
#
# The optional +random+ argument will be used as the random number generator:
# a.shuffle(random: Random.new(1)) #=> [1, 3, 2]
def shuffle(random: Random)
Primitive.rb_ary_shuffle(random)
end
# call-seq:
# array.sample(random: Random) -> object
# array.sample(n, random: Random) -> new_ary
#
# Returns random elements from +self+.
#
# When no arguments are given, returns a random element from +self+:
# a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
# a.sample # => 3
# a.sample # => 8
# If +self+ is empty, returns +nil+.
#
# When argument +n+ is given, returns a new \Array containing +n+ random
# elements from +self+:
# a.sample(3) # => [8, 9, 2]
# a.sample(6) # => [9, 6, 10, 3, 1, 4]
# Returns no more than <tt>a.size</tt> elements
# (because no new duplicates are introduced):
# a.sample(a.size * 2) # => [6, 4, 1, 8, 5, 9, 10, 2, 3, 7]
# But +self+ may contain duplicates:
# a = [1, 1, 1, 2, 2, 3]
# a.sample(a.size * 2) # => [1, 1, 3, 2, 1, 2]
# Returns a new empty \Array if +self+ is empty.
#
# The optional +random+ argument will be used as the random number generator:
# a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
# a.sample(random: Random.new(1)) #=> 6
# a.sample(4, random: Random.new(1)) #=> [6, 10, 9, 2]
def sample(n = (ary = false), random: Random)
Primitive.rb_ary_sample(random, n, ary)
end
end
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