26
27
canAppendChild(): boolean {
29
>
}
30
31
appendChild(node: Node) {
33
throw new Error('Cannot insert more than 3 children in a ListNode');
34
}
36
>
37
>
this._length += node.length;
38
>
this._updateParentLength(node.length);
39
>
if (!isLeaf(node)) {
40
node.parent = this;
41
}
43
44
private _updateParentLength(delta: number) {
46
>
while (updateParent) {
47
updateParent._length += delta;
48
updateParent = updateParent.parent;
49
}
51
52
unappendChild(): Node {