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Mar 21, 2018 at 19:23
Hack, the PHP dialect, uses a persistent hh_server so linting, finding definitions etc is fast. Whilst this is a more common model today (language server protocol, YouCompleteMe), it's an interesting design considering PHP is based on short-lived processes.

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Mar 28, 2023 at 05:13
What piece of syntax has the most different meanings? I realised today that `as` is extremely overloaded. It can be used for aliasing imports (Python), type casts (Rust), binding pattern match variables (OCaml), type assertions (Hack) and probably many others.
Aug 24, 2018 at 19:29
The vast majority of PLs are either self-hosted or implemented in a systems language (one without GC). The only exceptions I can think of are PureScript, Elm (both written in Haskell), Hack (partly uses OCaml) and Clojure (Java). Are there others? Is it a good tradeoff?
Jul 20, 2018 at 18:15
There seems to be a trend towards value-oriented programming languages. Even established statement-oriented languages are moving: Hack added ==> for values with anonymous functions, JS has fat arrows and now do syntax too.