Implementing Fractional Indexing

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David Greenspan. "Implementing Fractional Indexing." observablehq.com, October 2020. Archived at perma.cc/5N4R-MREN

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Implementing Fractional Indexing / David Greenspan | Observable

See https://www.figma.com/blog/realtime-editing-of-ordered-sequences/ for an introduction to fractional indexing, including what it is used for and how it works. We're going to call the fractional indices "order keys," or "keys" for short. The simplest fractional indexing scheme imaginable is to use JavaScript numbers as keys, with 0 representing the start of the list and 1 representing the end. (…

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