Lexicographically-subdivide the “space” between strings, by defining an alternate non-base-ten number system using a pre-defined dictionary of symbol↔︎number mappings. Handy for ordering NoSQL keys. (by fasiha)

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mudderjs reviews and mentions

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  • The surprisingly difficult problem of user-defined order in SQL
    2 projects | | 15 Jan 2021
    I have solved this problem for my own purposes — no claims of grand scalability or high efficiency — by storing indices or "ranks" of items as strings (Postgres TEXT) using a library called mudderjs[0] and a thin wrapper around it[1]. Sorted lexicographically (in dictionary order) arbitrary-length strings have arbitrary precision. You can always find a string between any two strings; for instance, between "a" and "b" is "am" and between "a" and "ab" is "aam". You do have to have the entire ordered collection in scope to generate a new rank for an item, but reordering an item only requires updating one row and isn't subject to floating point precision.




Basic mudderjs repo stats
3 months ago
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