From 13728e203e82a3225132fdc2437e6e28e3e2f6f7 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Wed, 4 Jun 2014 23:37:13 +0900
Subject: add Enumerable#to_h; ref #2348

---
 mrbgems/mruby-enum-ext/mrblib/enum.rb | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'mrbgems/mruby-enum-ext/mrblib/enum.rb')

diff --git a/mrbgems/mruby-enum-ext/mrblib/enum.rb b/mrbgems/mruby-enum-ext/mrblib/enum.rb
index 5abb75d54..5856fb363 100644
--- a/mrbgems/mruby-enum-ext/mrblib/enum.rb
+++ b/mrbgems/mruby-enum-ext/mrblib/enum.rb
@@ -669,4 +669,26 @@ module Enumerable
     end
     ary
   end
+
+  ##
+  #  call-seq:
+  #     enum.to_h  -> hash
+  #
+  #  Returns the result of interpreting <i>enum</i> as a list of
+  #  <tt>[key, value]</tt> pairs.
+  #
+  #     %i[hello world].each_with_index.to_h
+  #       # => {:hello => 0, :world => 1}
+  #
+
+  def to_h
+    h = {}
+    self.each do |*v|
+      v = v.__svalue
+      raise TypeError, "wrong element type #{v.class} (expected Array)" unless v.is_a? Array
+      raise ArgumentError, "element has wrong array length (expected 2, was #{v.size})" if v.size != 2
+      h[v[0]] = v[1]
+    end
+    h
+  end
 end
-- 
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