"the parser does not build objects across the boundary at all. It copies its arrays into one contiguous binary buffer and lets the consumer decode lazily on its own side. The serialization is close to a memory copy." www.arshad.fyi/writings/eng...
Engineering High-Performance Parsers with Data-Oriented Design
How designing the data structure first (flat arrays of indices instead of a pointer tree) makes a parser fast and collapses memory layout, allocation, and serialization into one decision.
arshad.fyi
![Code example showing the usage of Temporal.ZoneddateTime
```js
// London DST starts: 2026-03-29 01:00 -> 02:00
const zdt = Temporal.ZonedDateTime.from(
"2026-03-29T00:30:00+00:00[Europe/London]",
);
console.log(zdt.toString());
// → "2026-03-29T00:30:00+00:00[Europe/London]"
const plus1h = zdt.add({ hours: 1 });
console.log(plus1h.toString());
// "2026-03-29T02:30:00+01:00[Europe/London]" (01:30 doesn't exist)
```](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:r5emt2gkdrkb2yc6y7xndxpe/bafkreicgonzisednk3qegophndqf6fnslwtvbd7gshsgtv6fpi3arh2dsi)
![A JSON file representing a source map. The code contains:
{
"version": 3, // Always the integer 3
"file": "out.js", // Optional: name of the generated file
"sourceRoot": "", // Optional: prefix prepended to each entry in "sources"
"sources": ["foo.js", "bar.js"], // Required: list of original source URLs/paths (or null)
"sourcesContent": [null, null], // Optional: inlined source text, aligned with "sources"
"names": ["src", "maps"], // Optional: symbol names referenced by "mappings"
"mappings": "A,AAAB;;ABCDE", // Required: encoded mapping data (base64-VLQ deltas)
"ignoreList": [0] // Optional: indexes into "sources" considered "third-party"
}](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:ny4wl2lgdvgej5rzaxk45ccn/bafkreiftsj6be2ea7h64mk4nenpkybnly5vte6na3le6xb4jpxgarok62m)
