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nayuki
The way that the author uses pure Excel formulas (no VBA or macros) to compute a QR Code from scratch is similar to how I used pure Excel to compute ciphers:

* AES cipher internals in Excel: https://www.nayuki.io/page/aes-cipher-internals-in-excel

* DES cipher internals in Excel: https://www.nayuki.io/page/des-cipher-internals-in-excel

vegetablepotpie
That's really cool. I've been wanting to delve into the inner workings of ciphers for some time and I think this will make it easier.
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userbinator
(Pure) Excel is a form of dataflow programming --- the sequencing is implicit, but the flow of values is explicit. For algorithms that don't have arbitrary input-dependent looping, it is relatively easy to implement.
kebman
What's up with all the Excel hacks these days?
kerng
Excel - the handy old school swiss army knife for data processing and visualization. Its pretty interesting what some folks can pull of with it.