Plurrrr

Double Homicide: Good

In the afternoon I finished Double Homicide. I liked both stories; recommended.

• book
• crime fiction

How Free Monads Yield Extensible Effects

The Free monad gives you a Monad for any Functor. The Free monad can also be used to construct extensible effect systems. I never understood why Free why this was the case. It turns out it is deeply connected to their ability to yield monads for functors.

Source: How Free Monads Yield Extensible Effects.

• haskell

Slice Patterns

Rust 1.26 introduced a nifty little feature called Basic Slice Patterns which lets you pattern match on slices with a known length. Later on in Rust 1.42, this was extended to allow using .. to match on “everything else”.

As features go this may seem like a small addition, but it gives developers an opportunity to write much more expressive code.

Source: Slice Patterns, an article by Michael F. Bryan.

• rust