Can you directly manipulate a javascript variable in memory?

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Can you directly edit a javascripts variable in memory, similar to how pointers work in C++?

I have the following example that works but just…feels unsafe to use:

const testFunction = async () => {
  x = x + 20

I realize that the global scope is in play here, but surely there’s a better way to manipulate the memory directly?

Thank you!

I was hoping there’s a more direct way of doing the manipulation, especially if the variable needs to be referenced over several files.

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