todo.md

@@ -1,6 +1,60 @@
-# Todo
+```lua
+function TextInput(p: {
+    DefaultText: string,
+    Output: (string) -> ()
+} & Layout)
+    return create "TextBox" {
+        Layout = p.Layout,
+        Children = p.Children
+
+        BackgroundText = DefaultText,
+
+        [{"Changed"}] = function(self)
+            p.Output(self.Text)
+        end
+    }
+end
+
+function Counter()
+    local count = source(0)
+
+    return create "TextButton" {
+        Text = count
+    }
+end
+
+source
+derive
+map
+
+spring
+```
+
+onCleanup
+Index
+For
+untrack
+batch
+
+## version 1
+
+```lua
+map(items, function(item, i)
+    return Item {
+        Item = item, -- primitive
+        LayoutOrder = i
+    }
+end)
+```
+
+## version 2
+
+```lua
+each(items, function(item, i)
+    return Item {
+        Item = item, -- state
+        LayoutOrder = i
+    }
+end)
+```
 
-- investigate solid js `for` and batching
-- equality checking of derived state updates to prevent redundant updates of derived state
-- watcher callbacks when watcher watches a parent and child
-- stores