From daf83946bbf2834da8393cd50af2bc7bcee3289f Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Wed, 23 Mar 2016 11:49:28 +0900
Subject: add #dig to Array,Hash and Struct

---
 mrbgems/mruby-array-ext/mrblib/array.rb | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'mrbgems/mruby-array-ext')

diff --git a/mrbgems/mruby-array-ext/mrblib/array.rb b/mrbgems/mruby-array-ext/mrblib/array.rb
index f19581cdc..04637471d 100644
--- a/mrbgems/mruby-array-ext/mrblib/array.rb
+++ b/mrbgems/mruby-array-ext/mrblib/array.rb
@@ -744,4 +744,21 @@ class Array
   def to_ary
     self
   end
+
+  ##
+  # call-seq:
+  #   ary.dig(idx, ...)                 -> object
+  #
+  # Extracts the nested value specified by the sequence of <i>idx</i>
+  # objects by calling +dig+ at each step, returning +nil+ if any
+  # intermediate step is +nil+.
+  #
+  def dig(idx,*args)
+    n = self[idx]
+    if args.size > 0
+      n&.dig(*args)
+    else
+      n
+    end
+  end
 end
-- 
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