1 files changed, 36 insertions, 0 deletions
diff --git a/array.rb b/array.rb
new file mode 100755
index 0000000000..ed5779290f
--- /dev/null
+++ b/array.rb
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+#!/usr/bin/ruby
+class Array
+  # call-seq:
+  #    ary.shuffle!              -> ary
+  #    ary.shuffle!(random: rng) -> ary
+  #
+  # Shuffles elements in +self+ in place.
+  #
+  #    a = [ 1, 2, 3 ]           #=> [1, 2, 3]
+  #    a.shuffle!                #=> [2, 3, 1]
+  #    a                         #=> [2, 3, 1]
+  #
+  # The optional +rng+ argument will be used as the random number generator.
+  #
+  #    a.shuffle!(random: Random.new(1))  #=> [1, 3, 2]
+  def shuffle!(random: Random)
+    __builtin_rb_ary_shuffle_bang(random)
+  end
+
+  # call-seq:
+  #    ary.shuffle              -> new_ary
+  #    ary.shuffle(random: rng) -> 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 +rng+ argument will be used as the random number generator.
+  #
+  #    a.shuffle(random: Random.new(1))  #=> [1, 3, 2]
+  def shuffle(random: Random)
+    __builtin_rb_ary_shuffle(random);
+  end
+end