From ea5e231959365622607c8bfd953f6d96ec54a394 Mon Sep 17 00:00:00 2001
From: HybridDog <3192173+HybridDog@users.noreply.github.com>
Date: Sat, 1 Feb 2020 16:09:45 +0100
Subject: Add table.shuffle (#8299)

---
 builtin/common/misc_helpers.lua | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'builtin')

diff --git a/builtin/common/misc_helpers.lua b/builtin/common/misc_helpers.lua
index e4c7f4aa3..1e9a08851 100644
--- a/builtin/common/misc_helpers.lua
+++ b/builtin/common/misc_helpers.lua
@@ -576,6 +576,20 @@ function table.key_value_swap(t)
 end
 
 
+function table.shuffle(t, from, to, random)
+	from = from or 1
+	to = to or #t
+	random = random or math.random
+	local n = to - from + 1
+	while n > 1 do
+		local r = from + n-1
+		local l = from + random(0, n-1)
+		t[l], t[r] = t[r], t[l]
+		n = n-1
+	end
+end
+
+
 --------------------------------------------------------------------------------
 -- mainmenu only functions
 --------------------------------------------------------------------------------
-- 
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