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Yes, but it is typically frowned upon. Here's and MDN on it: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...

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Though in this case, it's a crazy performance hack from Vyacheslav Egorov. Check out the graph: https://cloud.githubusercontent.com/assets/934293/6550014/d3...

I would not call it a performance hack, it's just a readable way to write an algorithm - most important part of my original suggestion was actually to use x.charCodeAt(i) instead of x[i]

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