part 2

todo.md

@@ -0,0 +1,20 @@
+####### to do
+- make a button to destroy something and see what functions run (detach/destroy?)
+- use "The Dirty Flush pattern" somewhere
+    "You don't remember that chapter? That's because I just invented that name. Gross. ""
+- "Side Effect City" - Even the callbacks have side effects...
+  - maybe propose some changes to the dev mode output to make things more readable
+- Can `dirty` ever contain anything besides a single integer? In other words, are elements updated one after the next, or can `update` sometimes operate on more than one element at a run?
+  - no, because `make_dirty` only does its thing if dirty is [-1]:
+  - but try with a click handler that updates two props and see what happens to `dirty`
+  ```js
+    function make_dirty(component, i) {
+        if (component.$$.dirty[0] === -1) {
+            dirty_components.push(component);
+            schedule_update();
+            component.$$.dirty.fill(0);
+        }
+        component.$$.dirty[(i / 31) | 0] |= (1 << (i % 31));
+    }
+
+```