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Compiling a Lisp: Lambda Lifting

first – previous I didn’t think this day would come, but I picked up the Ghuloum tutorial (PDF) again and I got a little bit further. There’s just one caveat: I have rewritten the implementation in Python. It’s available in the same repo in compiler.py. It’s brief, coming in at a little over 300 LOC + tests (compared to the C version’s 1200 LOC + tests). I guess there’s another caveat, too, which is that the Python version has no S-expression reader. But that’s fine: consider it an exercise fo

Syncable vs. non-syncable passkeys: Are roaming authenticators the best of both worlds?

matejmo/Getty Images Like or not, a replacement for passwords -- known as passkeys -- is coming your way, if it hasn't already. The three big ideas behind passkeys are that they cannot be guessed in the way passwords often can (and are), the same passkey cannot be re-used across different websites and apps (the way passwords can), and you cannot be tricked into divulging your passkeys to malicious actors, often through techniques such as phishing, smishing, quishing, and malvertising. Also: Ho

Ninja Gaiden: Ragebound Is a Forgettable Chapter in the Series' Legacy

It looks like 2025 is the "Year of the Ninja." Assassin's Creed: Shadows was one of the big hits of the year's first half, a new Shinobi game is on the way, and Ninja Gaiden fans are being treated to a full trilogy: Ninja Gaiden 2 Black, released in January, Ninja Gaiden 4, arriving later this year and Ninja Gaiden: Ragebound, arriving Thursday. However, based on my experience, you might want to skip this installment: It's charming but far from satisfying. Ninja Gaiden Ragebound is a 2D side-sc

Laminar Flow Airfoil

Laminar Flow is the smooth, uninterrupted flow of air over the contour of the wings, fuselage, or other parts of an aircraft in flight. Laminar flow is most often found at the front of a streamlined body and is an important factor in flight. If the smooth flow of air is interrupted over a wing section, turbulence is created which results in a loss of lift and a high degree of drag. An airfoil designed for minimum drag and uninterrupted flow of the boundary layer is called a laminar airfoil. The

Meet the cement transport ship that makes cement ingredients while sailing

Shipping has a pollution problem, but one company has a solution that does more than just eliminate a boat’s carbon dioxide. London-based Seabound has developed a carbon capture system that transforms CO 2 from the engine into limestone, a key ingredient in cement. Fittingly, the company has installed it aboard the UBC Cork, a cement carrier currently sailing through the Mediterranean Sea. When the ship docks in Norway, the limestone created from the voyage will be offloaded and used to make m

Abstraction boundaries are optimization boundaries

Abstraction boundaries are optimization boundaries The N+1 query problem occurs when your application code sends one SQL query per element in a collection. The N queries are redundant; since all of the data is in the database already, a single query should be enough. This problem is usually caused by a leaky abstraction; the ORM, or whatever database abstraction you are using, can’t anticipate that it would need to send N queries, so it can’t automatically optimize this down to a single query.