https://arshad.fyi/ Writings by Arshad Yaseen on compilers, data-oriented design, systems programming, and interfaces. en Thu, 17 Sep 2026 00:00:00 +0000 https://arshad.fyi/writings/null-errors-and-enums-are-one-feature https://arshad.fyi/writings/null-errors-and-enums-are-one-feature Wed, 16 Sep 2026 00:00:00 +0000 A language design where optionals, errors, enums and booleans are all structural unions, taken apart by narrowing a name and a single or operator. https://arshad.fyi/writings/data-oriented-design-in-yukus-parser https://arshad.fyi/writings/data-oriented-design-in-yukus-parser Sun, 28 Jun 2026 00:00:00 +0000 How Yuku stores a JavaScript AST as flat arrays of u32 indices instead of a pointer tree, and what follows from that in allocation, lists, backtracking, strings, and the trip into JavaScript.