miniblog.

I'm a huge fan of Swift's 'Error Handling Rationale' design document: https://github.com/swiftlang/swift/blob/9315673c003875158852579bd1f33480cdec5461/docs/ErrorHandlingRationale.md#fundamentals It carefully defines terminology and compares with other languages, so you can understand Swift's position and preference in the design space.

Rust has an elegant solution to testing private functions: you put the test in the file that defines the function. It generally works well. I've even seen people argue that it makes mocking much less necessary! I've not felt the need to mock in Rust so far.

What defines the *feel* of a programming language? I've heard JS described as "composing lego blocks" due to npm, and Common Lisp with Sly feels like a place you explore (e.g. docs from the REPL). All PLs have tools though. Which ones set the vibe?