From db8265f428175ac19885e14c5b1beb3e8f6c5af4 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Tue, 17 Oct 2017 12:46:51 +0900
Subject: Add `Comparable#uniq`; CRuby2.4

---
 mrbgems/mruby-enum-ext/mrblib/enum.rb  | 16 ++++++++++++++++
 mrbgems/mruby-enum-lazy/mrblib/lazy.rb | 15 +++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/mrbgems/mruby-enum-ext/mrblib/enum.rb b/mrbgems/mruby-enum-ext/mrblib/enum.rb
index 7741e515d..327b573d4 100644
--- a/mrbgems/mruby-enum-ext/mrblib/enum.rb
+++ b/mrbgems/mruby-enum-ext/mrblib/enum.rb
@@ -708,4 +708,20 @@ module Enumerable
   def nil.to_h
     {}
   end
+
+  def uniq(&block)
+    hash = {}
+    if block
+      self.each do|*v|
+        v = v.__svalue
+        hash[block.call(v)] ||= v
+      end
+    else
+      self.each do|*v|
+        v = v.__svalue
+        hash[v] ||= v
+      end
+    end
+    hash.values
+  end
 end
diff --git a/mrbgems/mruby-enum-lazy/mrblib/lazy.rb b/mrbgems/mruby-enum-lazy/mrblib/lazy.rb
index c98681edf..9227abe8a 100644
--- a/mrbgems/mruby-enum-lazy/mrblib/lazy.rb
+++ b/mrbgems/mruby-enum-lazy/mrblib/lazy.rb
@@ -158,6 +158,21 @@ class Enumerator
       }
     end
 
+    def uniq(&block)
+      hash = {}
+      Lazy.new(self){|yielder, val|
+        if block
+          v = block.call(val)
+        else
+          v = val
+        end
+        unless hash.include?(v)
+          yielder << val
+          hash[v] = val
+        end
+      }
+    end
+
     alias force to_a
   end
 end
-- 
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