diff --git a/sys/apis/array.lua b/sys/apis/array.lua
new file mode 100644
index 0000000..b6ba255
--- /dev/null
+++ b/sys/apis/array.lua
@@ -0,0 +1,13 @@
+local Array = { }
+
+function Array.filter(it, f)
+	local ot = { }
+	for _,v in pairs(it) do
+		if f(v) then
+			table.insert(ot, v)
+		end
+	end
+	return ot
+end
+
+return Array