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calculang-miscellaneous-models reviews and mentions
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Dynamic programming in Haskell: automatic memoization
I develop calculang, a language for calculations. It converts concise formulae into Javascript.
Since calculation formulae are usually inherently pure, a `--memo` flag to the compiler memoizes the lot.
Many of my models are written in this recursive style and only work because of memoization. Sometimes other tricks are needed e.g. careful ordering of the calls, so that the memo is available before the stack breaks.
My first calculang example is a bouncing ball: the position at t depends speed and the position at t-1. With loops we'll usually discover the same thing, but it's so much harder to follow.
First-class memoization to proliferate this style is a really neat thing.
[0] https://github.com/calculang/calculang
[1] bouncing ball code: https://github.com/declann/calculang-miscellaneous-models/bl...
[2] bouncing ball initial post: https://observablehq.com/@declann/calculang-bouncing-ball?co...
[3] if you can tolerate my slow-load WIP devtools and are on a Desktop, this is better, with buttons to navigate through the model development (only some of which are working now!): https://models-on-a-plane.pages.dev/stories/bounce/
Stats
declann/calculang-miscellaneous-models is an open source project licensed under GNU Affero General Public License v3.0 which is an OSI approved license.
The primary programming language of calculang-miscellaneous-models is JavaScript.
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