From d4e1d4e94e866d498ead1f370236df216917a6c7 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Sun, 26 Jan 2020 18:34:18 +0900
Subject: Moved Array#sample to rbinc

---
 array.rb | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'array.rb')

diff --git a/array.rb b/array.rb
index ed5779290f..25da88cde8 100755
--- a/array.rb
+++ b/array.rb
@@ -33,4 +33,31 @@ class Array
   def shuffle(random: Random)
     __builtin_rb_ary_shuffle(random);
   end
+
+  # call-seq:
+  #    ary.sample                  -> obj
+  #    ary.sample(random: rng)     -> obj
+  #    ary.sample(n)               -> new_ary
+  #    ary.sample(n, random: rng)  -> new_ary
+  #
+  # Choose a random element or +n+ random elements from the array.
+  #
+  # The elements are chosen by using random and unique indices into the array
+  # in order to ensure that an element doesn't repeat itself unless the array
+  # already contained duplicate elements.
+  #
+  # If the array is empty the first form returns +nil+ and the second form
+  # returns an empty array.
+  #
+  #    a = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]
+  #    a.sample         #=> 7
+  #    a.sample(4)      #=> [6, 4, 2, 5]
+  #
+  # The optional +rng+ argument will be used as the random number generator.
+  #
+  #    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)
+    __builtin_rb_ary_sample(random, n, ary)
+  end
 end
-- 
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