Python dataclass equivalent

• truss

  4 296 5.9 Clojure

  Assertions micro-library for Clojure/Script (by taoensso)

  

I haven't tried it myself. I generally just use truss for runtime constraint checking. I use a modified version that integrates scope-capture. And malli validation for more complex cases, but I try to limit that. For me it is better to validate individual attributes as needed, vs validating an entire "type"/collection of attributes. So each function only cares about the attributes that it needs, and validates only as needed.

• scope-capture

  9 557 0.0 Clojure

  Project your Clojure(Script) REPL into the same context as your code when it ran

I haven't tried it myself. I generally just use truss for runtime constraint checking. I use a modified version that integrates scope-capture. And malli validation for more complex cases, but I try to limit that. For me it is better to validate individual attributes as needed, vs validating an entire "type"/collection of attributes. So each function only cares about the attributes that it needs, and validates only as needed.

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• ghostwheel

  2 597 4.0 Clojure

  Hassle-free inline clojure.spec with semi-automatic generative testing and side effect detection

if all you care about is information / documentation, and maybe validation, then spec or malli are fine. using spec during runtime to simulate a type system is a poor choice in most cases, because you are doing runtime type checking (something akin to dependent types or even esoteric contracts that are hard/impossible to express statically). There are some libs that help bolt a typed facade (using spec) onto the familiar defn / fn, https://github.com/gnl/ghostwheel https://github.com/Provisdom/defn-spec .

• defn-spec

  1 53 0.0 Clojure

  Add function args and return Spec checking via assertions

  

if all you care about is information / documentation, and maybe validation, then spec or malli are fine. using spec during runtime to simulate a type system is a poor choice in most cases, because you are doing runtime type checking (something akin to dependent types or even esoteric contracts that are hard/impossible to express statically). There are some libs that help bolt a typed facade (using spec) onto the familiar defn / fn, https://github.com/gnl/ghostwheel https://github.com/Provisdom/defn-spec .

• spec-tools

  3 592 4.1 Clojure

  Clojure(Script) tools for clojure.spec

  

I like spec-tools data specs. I never got into schema, although I was aware of it. spec came along and swept a substantial portion of the crowd (I think the interleaving of parsing and regex style operators is slick/useful). Malli looks excellent though, and I think it's worthy of learning. I have no opinion on spec2 as of yet.

• datascript

  24 5,352 7.7 Clojure

  Immutable database and Datalog query engine for Clojure, ClojureScript and JS

Meta comment: Many complex tree shapes are actually projections of a graph. Graphs are shapeless and normalized; it is the query that projects the graph into tree shapes that are denormalized. Thus massive python/java nested OO data models with rigid and denormalized shapes can be collapsed into a flattened, normalized graph. Do you have a graph? Clojure has easy graph data structures through https://github.com/tonsky/datascript

• plumbing

  2 1,484 0.0 Clojure

  Prismatic's Clojure(Script) utility belt

  

This library https://github.com/plumatic/plumbing, a predecessor of spec, has variants of defn and fn that allow you to specify the schema inline, sort of similar to type hints.

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