From 170f67dd5801afe8ea60ced18500ee50ba10b28b Mon Sep 17 00:00:00 2001
From: Kim Alvefur <zash@zash.se>
Date: Fri, 31 Mar 2017 17:29:08 +0200
Subject: util.array: Add method for filtering out duplicate values

---
 util/array.lua | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/util/array.lua b/util/array.lua
index 05fa97ca..150b4355 100644
--- a/util/array.lua
+++ b/util/array.lua
@@ -92,6 +92,18 @@ function array_base.sort(outa, ina, ...)
 	return outa;
 end
 
+function array_base.unique(outa, ina)
+	local seen = {};
+	return array_base.filter(outa, ina, function (item)
+		if seen[item] then
+			return false;
+		else
+			seen[item] = true;
+			return true;
+		end
+	end);
+end
+
 function array_base.pluck(outa, ina, key)
 	for i = 1, #ina do
 		outa[i] = ina[i][key];
-- 
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