Made some suggestions

[hefeng6500]

Hi loiane

I am the Chinese reader of your book "Learning javascript data structure and algorithm". I am studying the AVL tree and found a line of code in the method of removeNode that is unnecessary,

link this

this.getBalanceFactor(node.left) === BalanceFactor.BALANCED

Because I think if the tree is balanced, there is no need to move

additionally，I submitted a request in the project , do you have permission to merge the code for me?

PR： PacktPublishing/Learning-JavaScript-Data-Structures-and-Algorithms-Third-Edition#12

Looking forward to your response！

[Jeffzholy]

Hey @loiane , think this issue is fixed by this PR #193. And also @hefeng6500, your issue description is not related with the PR that you mentioned in the description? In a word this issue can be safely closed

[loiane]

@Jeffzholy thanks!