Cannot use a method in a button's callback

[DavidP]

Hello,
I have a button in my class. The button’s callback is supposed to call a method of the class buttonCB(), but I am getting an error on click
Uncaught TypeError: this.buttonCB is not a function

Babylon.js Playground

However, if my callback is a function, not a class’ method, I am getting the expected results

Babylon.js Playground

Can you please let me know what I am missing in the first example?

It might be related to my other post

A class to keep track of loaded assets

Hello, I am looking for a simple way to keep track of loaded assets (their names). To this end, I introduced cLoader manager class that records asset names on successful load - cLoader has loadedMeshNames array data member and, on successful load, the new mesh name is appended to this array. Thus if I want to keep track of a particular mesh, for example, I can load the mesh through this class. Here is my playground Unfortunately, that does not work because I am getting an error in the callb…

thank you

[musk]

This is because ‘this’ has changed; you should use arrow functions to avoid ‘this’ reference errors.
pg: https://playground.babylonjs.com/#DZQ7MD#2

[DavidP]

@musk Thank you for your solution and highlighting usage of arrow functions. That is super useful as I am new to javascript