From 9b16c635b35aab56e0f3f52f092a3ae829116c57 Mon Sep 17 00:00:00 2001
From: ElectricalBoy <15651807+ElectricalBoy@users.noreply.github.com>
Date: Thu, 21 May 2026 12:29:23 +0900
Subject: [PATCH 1/3] rewrite Array.interleave

---
 lua/wikis/commons/Array.lua | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/lua/wikis/commons/Array.lua b/lua/wikis/commons/Array.lua
index 0bbf15d7bd7..9c2216cf408 100644
--- a/lua/wikis/commons/Array.lua
+++ b/lua/wikis/commons/Array.lua
@@ -727,13 +727,12 @@ end
 ---@param x T
 ---@return (V|T)[]
 function Array.interleave(elements, x)
-	local size = #elements
-	return Array.flatMap(elements, function(element, index)
-		if index == size then
-			return {element}
-		end
-		return {element, x}
-	end)
+	local ret = {elements[1]}
+	for i = 2, #elements do
+		table.insert(ret, x)
+		table.insert(ret, elements[i])
+	end
+	return ret
 end
 
 return Array

From 5f50634875fcd7c9e5cbb0ee39155e4e938753fb Mon Sep 17 00:00:00 2001
From: ElectricalBoy <15651807+ElectricalBoy@users.noreply.github.com>
Date: Thu, 21 May 2026 12:37:31 +0900
Subject: [PATCH 2/3] more test cases

---
 lua/spec/array_spec.lua | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lua/spec/array_spec.lua b/lua/spec/array_spec.lua
index 91291285fb5..92fb5b589fd 100644
--- a/lua/spec/array_spec.lua
+++ b/lua/spec/array_spec.lua
@@ -310,6 +310,8 @@ describe('array', function()
 	describe('Interleave', function ()
 		it('works', function()
 			assert.are_same({'a', ' ', 'b', ' ', 'c'}, Array.interleave({'a', 'b', 'c'}, ' '))
+			assert.are_same({'a'}, Array.interleave({'a'}, ' '))
+			assert.are_same({}, Array.interleave({}, ' '))
 		end)
 	end)
 end)

From 9862ae24c5cb7d4529abb634c0c921fe3bbb51fa Mon Sep 17 00:00:00 2001
From: ElectricalBoy <15651807+ElectricalBoy@users.noreply.github.com>
Date: Thu, 21 May 2026 14:52:27 +0900
Subject: [PATCH 3/3] another test case

---
 lua/spec/array_spec.lua | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lua/spec/array_spec.lua b/lua/spec/array_spec.lua
index 92fb5b589fd..820def2d1a9 100644
--- a/lua/spec/array_spec.lua
+++ b/lua/spec/array_spec.lua
@@ -313,5 +313,10 @@ describe('array', function()
 			assert.are_same({'a'}, Array.interleave({'a'}, ' '))
 			assert.are_same({}, Array.interleave({}, ' '))
 		end)
+
+		it('with nested array', function ()
+			local a, b = Array.range(1, 3), math.pi
+			assert.are_same({{1, 2, 3}, ' ', b}, Array.interleave({a, b}, ' '))
+		end)
 	end)
 end)