15 lines
869 B
Plaintext
15 lines
869 B
Plaintext
---
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name: "Elevators"
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subtitle: "Why the elevator isn't coming, run at 25× until you can see the answer"
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date: 2026-08-02
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shortlist: true
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link: "https://john.fun/elevators"
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linkText: "john.fun"
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source: "Hacker News — Show HN"
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topics: [web-tools, learning-and-reference]
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tags: [interactive, algorithms, explainer, free]
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description: "An interactive explainer on elevator scheduling — SCAN, LOOK and multi-car dispatch, all running live in the page at up to 25× speed."
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---
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The SCAN algorithm was patented in 1961: ride to the top, reverse, collect everyone on the way down. LOOK stops at the highest floor actually requested, which is the behaviour you already expect from a lift. Both run live in the page at 1×, 5× or 25×, and a button drops five fresh calls into the shafts so you can watch the assign-it-to-the-nearest-car rule come apart in front of you.
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