# nzakas/understandinges6

Content for the ebook "Understanding ECMAScript 6"

Repository: https://github.com/nzakas/understandinges6
Canonical: https://ross.abutalabs.com/products/understandinges6
License Family: other
Topics: leanpub, ebook, zakas, javascript
Last push: 2022-01-12T00:51:27+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": 4543, "days_push": 1695, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 5406, forks 778 (observed 2026-08-28T04:09:17.646465+00:00)

## What it is
The open-source source content for the ebook 'Understanding ECMAScript 6' by Nicholas C. Zakas, written in Leanpub Markdown. It is a free guide teaching JavaScript developers the changes introduced in ECMAScript 6, from classes and arrow functions to promises and modules.

## Use cases
- learn es6 features
- understand javascript promises and generators
- transition from ecmascript 5 to es6
- learn arrow functions and classes in javascript
- free ebook on modern javascript
- study javascript modules and iterators

## When to choose
- you want a free, well-regarded explanation of ES6 features
- you are a JavaScript or Node.js developer moving from ES5
- you prefer learning from a structured book format

## When to avoid
- you need up-to-date coverage of post-ES6 JavaScript features
- you want interactive exercises rather than prose
- you need a maintained tutorial - the book is finished and content is historical

## Facets
- artifact type: learning-resource
- maturity: maintenance
- function: documentation, markdown
- domain: programming-languages, tutorials, web-development, education
- platform: cross-platform
- tags: ebook, javascript, ecmascript-6, es6, leanpub, book, nodejs

## Member repositories
- nzakas/understandinges6 (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:17.646465+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 2026-08-29T17:57:47.793113+00:00, confidence not recorded.
  - readme: https://github.com/nzakas/understandinges6 (fetched 2026-08-28T04:09:17.646465+00:00, sha b8e633998314)
- Data as of 2026-08-30T08:39:29.467469+00:00.