mangle | clj-3df | |
---|---|---|
9 | 4 | |
1,038 | 326 | |
0.9% | 0.9% | |
6.7 | 0.0 | |
16 days ago | over 4 years ago | |
Go | Clojure | |
Apache License 2.0 | Eclipse Public License 2.0 |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
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For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
mangle
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Learn Datalog Today
Mangle https://github.com/google/mangle is an open-source implementation in golang, it was an explicit goal to make it easy to learn. Meaning: it is easy to recognize the pure datalog part, the syntax is following the good old course material.
It was discussed here: https://news.ycombinator.com/item?id=33756800
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Prolog for Data Science
Logic programming offers a good foundation for anything that people call "rule engines." Within logic programming, there is some variation on the degree of declarativeness.
Datalog is arguably the minimal core logic programming, similar to what the lambda calculus achieves for functional programming. Unfortunately, it has been forgotten outside of database and query processing realm. A resurgence has happened in recent years, as PL researchers and also industry have discovered the virtues of datalog (e.g. Flix, DataFun). My own attempt at making this more widely known is here https://github.com/google/mangle, a language from the datalog family and its implementation as a go library.
As the example shows: plain "rules" (or: plain datalog) is rarely enough to capture everything that one wants to express: the question then is, how to combine a pure declarative "kernel" with more general purpose programming (e.g. mapping a list).
PROLOG offered one answer, already in the 1980s, but I fully reject it: the fact that the writing a program in the wrong order with negation and recursion makes it non-terminating is not something we'd want everyone to deal with. Datalog with stratified recursion is somewhat better, as "layers of rules" is a concept that is easy to understand.
In mainstream programming languages, the possibility of writing non-terminating programs also exists, but is rarely an issue. That is why I believe a good combination of declarative and general-purpose has to make it really easy to recognize which parts of a program are in the declarative, terminating, safe kernel and which parts require more attention from the programmer.
- Maps and structs in Mangle datalog
- Mangle, a programming language for deductive database programming
- Mangle: Programming language for deductive database programming
clj-3df
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Learn Datalog Today
> Datomic has a notion of rules which are mostly syntax sugar and do not support this sort of recursive reasoning.
> Why is that a big deal? When rules are run automatically, you can build live, reactive systems, not just a database that sits around waiting for you to query it.
There was at least one serious attempt to bring these worlds together: https://github.com/sixthnormal/clj-3df
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sixthnormal/clj-3df - pub/sub based on datalog and differential dataflow
It seems there's something of an update to the project status here: https://github.com/sixthnormal/clj-3df/issues/46 It's not actively maintained though there seems to be work on a successor product.
- Clj-3DF: Clojure(Script) Client for Declarative Dataflow
What are some alternatives?
biscuit-go
differential-dataflow - An implementation of differential dataflow using timely dataflow on Rust.
pengine - pengines (SWI Prolog) client for Go
clingo - 🤔 A grounder and solver for logic programs.
go - Trealla Prolog embedded in Go using WASM
OPA (Open Policy Agent) - Open Policy Agent (OPA) is an open source, general-purpose policy engine.
logica - Logica is a logic programming language that compiles to SQL. It runs on Google BigQuery, PostgreSQL and SQLite.
dex-lang - Research language for array processing in the Haskell/ML family
wuffs - Wrangling Untrusted File Formats Safely
rune - Rune is a programming language developed to test ideas for improving security and efficiency.
csuite-saas-metric-generat
csuite-saas-metric-generator - Tell ‘em what they want to hear!