diff --git a/lib/table.lua b/lib/table.lua
new file mode 100644
index 0000000..f47e11d
--- /dev/null
+++ b/lib/table.lua
@@ -0,0 +1,50 @@
+--1
+local function filter(tbl, f)
+  if tbl == nil then return nil end
+  if f == nil then return {} end
+  local t = {}
+  for k,v in pairs(tbl) do 
+    if f(v,k,tbl) then t[#t+1] = v end
+  end
+  return t
+end
+local function find(tbl, f)
+  if tbl == nil then return nil end
+  if f == nil then return nil end
+  for k,v in pairs(tbl) do
+    if f(v,k,tbl) then return v, k end
+  end
+  return nil
+end
+local function map(tbl, f)
+  if tbl == nil then return nil end
+  if f == nil then return tbl end
+  local t = {}
+  for k,v in pairs(tbl) do
+    t[k] = f(v,k,tbl)
+  end
+  return t
+end
+local function reduce(tbl, f, initial)
+  if tbl == nil then return nil end
+  if f == nil then return tbl end
+  local result
+  local startIndex = 1
+  if initial then
+    result = initial
+  else
+    result = tbl[1]
+    startIndex = 2
+  end
+  for i = startIndex,#tbl do
+    result = f(result, tbl[i], i, tbl)
+  end
+  return result
+end
+
+return {
+  filter = filter,
+  find = find,
+  map = map,
+  reduce = reduce
+}
\ No newline at end of file
diff --git a/list.json b/list.json
index 0defa68..93356e1 100644
--- a/list.json
+++ b/list.json
@@ -1 +1 @@
-[{"name":"batmon.lua","version":4},{"name":"config-loader.lua","version":1},{"name":"door.lua","version":1},{"name":"installer.lua","version":9},{"name":"place-item.lua","version":3},{"name":"reactorcontrol.lua","version":5},{"name":"seq-client.lua","version":1},{"name":"signal-slider.lua","version":4},{"name":"turbinecontrol.lua","version":16},{"name":"websocket.lua","version":12}]
\ No newline at end of file
+[{"name":"batmon.lua","version":4},{"name":"config-loader.lua","version":1},{"name":"door.lua","version":1},{"name":"installer.lua","version":9},{"name":"lib/table.lua","version":1},{"name":"place-item.lua","version":3},{"name":"reactorcontrol.lua","version":5},{"name":"seq-client.lua","version":1},{"name":"signal-slider.lua","version":4},{"name":"turbinecontrol.lua","version":16},{"name":"websocket.lua","version":12}]
\ No newline at end of file