# jlongster/transducers.js

A small library for generalized transformation of data (inspired by Clojure's transducers)

Repository: https://github.com/jlongster/transducers.js
Canonical: https://ross.abutalabs.com/products/transducersjs
Language: JavaScript
License: BSD-2-Clause
License Family: permissive
Last push: 2017-06-12T01:28:58+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 4367, "days_push": 3370, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1719, forks 54 (observed 2026-08-28T04:05:26.624604+00:00)

## What it is
A small JavaScript library implementing Clojure-style transducers for generalized data transformation across arrays, objects, iterators, and immutable data structures. It composes map/filter/take transformations without intermediate collections for better performance.

## Use cases
- compose map filter take transformations over any collection
- transform data without intermediate arrays for performance
- apply the same transformation to arrays, objects, and iterators
- process infinite generators with early termination
- work with immutable-js data structures using one transformation pipeline

## When to choose
- you want Clojure-style transducers in JavaScript
- you need high-performance chained transformations without intermediate collections
- you need one transformation pipeline that works across multiple data structure types

## When to avoid
- you need a maintained library with recent updates or active support
- you just need simple array operations that native JS or lodash already cover
- you need lazy streams with rich operators rather than transducer semantics

## Facets
- artifact type: library
- maturity: abandoned
- function: serialization
- domain: developer-tools, data-science
- platform: browser
- tags: transducers, functional-programming, data-transformation, iterators, immutable-js, algorithms, nodejs, javascript

## Member repositories
- jlongster/transducers.js (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:26.624604+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:34:07.414775+00:00, confidence not recorded.
  - readme: https://github.com/jlongster/transducers.js (fetched 2026-08-28T04:05:26.624604+00:00, sha f5310a0c6175)
  - registry_npm: https://registry.npmjs.org/transducers.js (fetched 2026-08-29T11:10:19.059622+00:00, sha 4b54c8d3f94d)
- Data as of 2026-08-30T08:39:29.467469+00:00.