feat: add array shuffle func

array.lua

@@ -0,0 +1,38 @@
+local function arrayEqual(a1, a2)
+  -- Check length, or else the loop isn't valid.
+  if #a1 ~= #a2 then
+    return false
+  end
+
+  -- Check each element.
+  for i, v in ipairs(a1) do
+    if v ~= a2[i] then
+      return false
+    end
+  end
+
+  -- We've checked everything.
+  return true
+end
+
+local function shuffle(tbl)
+  for i = #tbl, 2, -1 do
+    local j = math.random(i)
+    tbl[i], tbl[j] = tbl[j], tbl[i]
+  end
+  return tbl
+end
+
+local function find(tbl, val)
+  for i, value in ipairs(tbl) do
+    if value == val then
+        return i
+    end
+  end
+end
+
+return {
+  equal = arrayEqual,
+  shuffle = shuffle,
+  find = find,
+}

is_array_equ.lua

@@ -1,18 +0,0 @@
-local function arrayEqual(a1, a2)
-  -- Check length, or else the loop isn't valid.
-  if #a1 ~= #a2 then
-    return false
-  end
-
-  -- Check each element.
-  for i, v in ipairs(a1) do
-    if v ~= a2[i] then
-      return false
-    end
-  end
-
-  -- We've checked everything.
-  return true
-end
-
-return arrayEqual