How to implement a lock in JavaScript

Question

How could something equivalent to lock in C# be implemented in JavaScript?

So, to explain what I\'m thinking a simple use case is:

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Answer 1

I've had success mutex-promise.

I agree with other answers that you might not need locking in your case. But it's not true that one never needs locking in Javascript. You need mutual exclusivity when accessing external resources that do not handle concurrency.