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Testing is important, and it’s hard to get people to do as much of it as theyshould. Testing tools matter because the smoother the process is, the more tests...

Automated testing is a powerful tool for finding bugs and specifying correctnessproperties of code. Haskell’s Quickcheck library is the most well-knownautoma...

I’m not sure how I’ve managed to use rsync for so many years without evernoticing this, but hey, you learn something new every day!

Jane Street is a serious functional programming shop. We use OCaml, a staticallytyped functional language for almost everything and have what is probably the...

I’m pleased to announce the release ofIncremental (wellcommented mlihere),a powerful library for building self-adjusting computations, i.e.,computations that...

As with many projects in the OCaml world, at Jane Street we have been working onmigrating from camlp4 to ppx. After having developed equivalent ppx rewriters...

Even though registers are a low-level CPU concept, having some knowledge aboutthem can help write faster code. Simply put, a CPU register is a storage for as...

In the spirit of reinventing the wheel for fun, I hacked this together as aquick challenge to myself last week. It’s a little rough around the edges, but Ith...

We’ve been doing a bunch of work recently on improving the responsiveness ofOCaml’s garbage collector. I thought it would be worth discussing thesedevelopmen...

The official OCaml documentation “Interfacing C withOCaml” doesn’tdocument some interesting performance features.