Noescape

detach-link-notes.md

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+* D E F
+* A B C
+
+`E.insertAfter(B) ->`
+
+* D F
+* A B E C
+
+* B
+  * _next_ = C
+  * prev = A
+
+* C
+ * next = null
+ * _prev_ = B
+
+* E
+ * _next_ = F
+ * _prev_ = D
+ * _parent_ = ???
+
+* D
+ * _next_ = E
+ * _prev_ = F
+
+* F
+  * next = null
+  * _prev_ = E
+
+italic properties must change.
+
+```D
+// first, fix old nodes.
+if(E == E.parent.firstChild) // nope
+  // E.prev must be null if this is true, short circuit logic?
+  E.parent.firstChild = E.next;
+if(E == E.parent.lastChild) // nope
+  // E.next must be null if this is true, short circuit logic?
+  E.parent.lastChild = E.prev;
+if(E.next) // F
+  E.next.prev = E.prev;
+if(E.prev) // D
+  E.prev.next = E.next;
+// insertBefore is an exact mirror of this beyond this point, and identical before.
+// the links on E are free to scram now
+E.prev = B;
+E.next = B.next;
+
+// now, set links to E
+
+if(B.next) // C
+  B.next.prev = E;
+B.next = E;
+```
+
+in addition to setting, 
+Any time you set next, you have to check old.next.prev, and old.parent.lastChild
+- insertAfter
+- also insertBefore for setting dest.next
+Any time you set prev, you have to check old.prev.next, and old.parent.firstChild
+- insertBefore
+- also insertAfter, for setting dest.prev
+Any time you set parent, you have to check old.parent.firstChild and old.parent.lastChild
+- ??? insertChild? probably never do this. below will both be needed
+Any time you set firstChild you have to check old.parent.firstChild (set it to new.next, set it.prev = new)
+- appendChild
+Any time you set lastChild, you have to check old.parent.lastChild
+- prependChild