# goldmansachs/gs-collections

GS Collections has been migrated to the Eclipse Foundation, re-branded as Eclipse Collections.  https://www.eclipse.org/collections/

Repository: https://github.com/goldmansachs/gs-collections
Canonical: https://ross.abutalabs.com/products/gs-collections
Homepage: https://www.eclipse.org/collections/
Language: Java
License Family: other
Last push: 2023-03-20T19:23:56+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 5367, "days_push": 1262, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1822, forks 276 (observed 2026-08-28T04:05:41.098040+00:00)

## What it is
GS Collections is a collections framework for Java with JDK-compatible List, Set, and Map implementations, a rich iteration API inspired by Smalltalk, and optimized container types like Bag, Multimap, and BiMap. The project has been migrated to the Eclipse Foundation and re-branded as Eclipse Collections, with only critical bug fixes ported back to this repository.

## Use cases
- replace ArrayList, HashSet, and HashMap with memory-optimized Java collections
- write fluent functional iteration code over lists, sets, and maps in Java
- use Bag, Multimap, and BiMap container types missing from the JDK
- reduce duplication in collection iteration code with select, reject, and collect patterns
- run parallel and lazy iteration over Java collections

## When to choose
- you are maintaining a legacy codebase already using GS Collections
- you need the historical 7.x feature set before migrating

## When to avoid
- you are starting a new Java project - use Eclipse Collections instead
- you need new features or ongoing development

## Facets
- artifact type: library
- maturity: maintenance
- function: developer-tools
- domain: developer-tools
- platform: jvm
- tags: collections-framework, java, functional-programming, eclipse-collections, migrated, algorithms

## Member repositories
- goldmansachs/gs-collections (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:41.098040+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 2026-08-30T03:19:54.832981+00:00, confidence not recorded.
  - readme: https://github.com/goldmansachs/gs-collections (fetched 2026-08-28T04:05:41.098040+00:00, sha b5c1de9104c3)
  - homepage: https://www.eclipse.org/collections/ (fetched 2026-08-29T10:58:49.452283+00:00, sha 91228489c001)
- Data as of 2026-08-30T08:39:29.467469+00:00.