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[DOC] Tweaks for Array#shuffle! #11891

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Oct 15, 2024
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24 changes: 17 additions & 7 deletions array.rb
Original file line number Diff line number Diff line change
Expand Up @@ -45,15 +45,25 @@ def each
end

# call-seq:
# array.shuffle!(random: Random) -> array
# shuffle!(random: Random) -> self
#
# Shuffles the elements of +self+ in place.
# a = [1, 2, 3] #=> [1, 2, 3]
# a.shuffle! #=> [2, 3, 1]
# a #=> [2, 3, 1]
# Shuffles all elements in +self+ into a random order,
# as selected by the object given by keyword argument +random+;
# returns +self+:
#
# The optional +random+ argument will be used as the random number generator:
# a.shuffle!(random: Random.new(1)) #=> [1, 3, 2]
# a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
# a.shuffle! # => [5, 3, 8, 7, 6, 1, 9, 4, 2, 0]
# a.shuffle! # => [9, 4, 0, 6, 2, 8, 1, 5, 3, 7]
#
# Duplicate elements are included:
#
# a = [0, 1, 0, 1, 0, 1, 0, 1, 0, 1]
# a.shuffle! # => [1, 0, 0, 1, 1, 0, 1, 0, 0, 1]
# a.shuffle! # => [0, 1, 0, 1, 1, 0, 1, 0, 1, 0]
#
# The object given with keyword argument +random+ is used as the random number generator.
#
# Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
def shuffle!(random: Random)
Primitive.rb_ary_shuffle_bang(random)
end
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