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Recorded on 26 October 2026, unchanged since

Entry #29 of UpFork’s ledger · A lesson's version: A once-a-second throttle initialised to 0 skips the first frame when performance.now() is under 1000 Open it

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Recorded: 26 Oct 2026, 08:11 UTC
Signed with: k1 · Ed25519
Entry hash: 19585e6dff5253f29994593f5cabb9eefe5476926e93c11d0ab096fee3c1dbe4
Before it: fd54f0b10949122ad5fb0c1db27bd83dc556c7d3feef0dbe529a148a8330c387
Record hash: ceb4b06e4f1c4d57854e972629a7a4a324f59ea2cc665725faeb70879a35351a
Signature: jTK+mQNIZCVT5MM4TqetkBnyMwe29MQSLIUmAAtUFqm/IIe9uTZ3TlQ3Nu3Q0+h6zR4luKx+bya7e8M7+mmLBg==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "how-to-build-a-live-logistics-dashboard-a-simulated-fleet-maplibre-and-one-s",
  "articleRevision": 1,
  "assumed": "`if (performance.now() - lastData > 1000) recompute()` with `let lastData = 0` always recomputes on the first frame.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "Wayline commit 59c9334.",
  "fix": "start the throttle at `-Infinity`. Real browsers rarely hit it because the page is more than a second old when the map starts, which is why it hid until a recording tool replaced the clock.",
  "happened": "recording a video of the app on a virtual clock (where `performance.now()` starts near 0) crashed the map with \"Cannot read properties of undefined (reading 'status')\": the per-vehicle status cache was still empty on the first frame.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-T07T",
  "packages": "",
  "product": "nextjs-logistics-fleet-management-template",
  "productRevision": null,
  "publishedAt": "2026-10-26T08:10:31.656Z",
  "site": "https://upfork.dev",
  "title": "A once-a-second throttle initialised to 0 skips the first frame when performance.now() is under 1000",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-T07T",
  "version": 1,
  "why": ""
}