Change singleton pattern counter class

[bpetermann]

Hi, the counter class gave me the following error messages:

• counter is not defined
• After initialization (this.counter = 0) "counter is read-only"

Removing Object.freeze and returning the instance in the constructor should resolve this issue.

Otherwise, as in the Objects example, counter can also be initiated outside the class: let counter = 0; After that, however, the "this" keyword would have to be removed from the methods.

Thanks!

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