[Minor] Add lua_util.shuffle

1 files changed, 15 insertions, 0 deletions

diff --git a/lualib/lua_util.lua b/lualib/lua_util.lua
index 9dc017839..929488929 100644
--- a/lualib/lua_util.lua
+++ b/lualib/lua_util.lua
@@ -1461,4 +1461,19 @@ exports.maybe_smtp_quote_value = function(str)
   return str
 end
 
+---[[[
+-- @function lua_util.shuffle(table)
+-- Performs in-place shuffling of a table
+-- @param {table} tbl table to shuffle
+-- @return {table} same table
+--]]]
+exports.shuffle = function(tbl)
+  local size = #tbl
+  for i = size, 1, -1 do
+    local rand = math.random(size)
+    tbl[i], tbl[rand] = tbl[rand], tbl[i]
+  end
+  return tbl
+end
+
 return exports