# tc39/proposal-bind-operator

This-Binding Syntax for ECMAScript

Repository: https://github.com/tc39/proposal-bind-operator
Canonical: https://ross.abutalabs.com/products/proposal-bind-operator
License Family: other
Last push: 2018-01-19T16:03:21+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": 4263, "days_push": 3148, "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 1754, forks 28 (observed 2026-08-28T04:05:32.032964+00:00)

## What it is
A TC39 proposal for ECMAScript introducing a `::` operator for `this` binding and method extraction, enabling syntactic sugar like `obj::method` and 'virtual method' library pipelines. The repository contains the specification text, examples, and links to prototype implementations in Babel and esdown.

## Use cases
- extract a bound method from an object in JavaScript
- call a function with a specific this value without .call()
- chain virtual methods from libraries like jQuery or iterator helpers
- understand the history of the ECMAScript bind operator proposal
- evaluate stalled TC39 syntax proposals for language design research

## When to choose
- you are researching TC39 proposal history or language design
- you want to experiment with the :: operator via Babel's prototype support
- you need reference examples of method extraction syntax

## When to avoid
- you need a syntax that works in production JavaScript engines - the proposal is stalled and unsupported
- you want a runnable library or tool rather than a specification document
- you need modern alternatives like arrow functions or Function.prototype.bind

## Facets
- artifact type: learning-resource
- maturity: abandoned
- function: programming-language, developer-tools
- domain: programming-languages, web-development, documentation
- platform: cross-platform
- tags: ecmascript-proposal, tc39, bind-operator, javascript-syntax, specification, stage-1-proposal, method-extraction, javascript

## Member repositories
- tc39/proposal-bind-operator (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:32.032964+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 2026-08-30T03:28:09.072240+00:00, confidence not recorded.
  - readme: https://github.com/tc39/proposal-bind-operator (fetched 2026-08-28T04:05:32.032964+00:00, sha 5f730e91d025)
- Data as of 2026-08-30T08:39:29.467469+00:00.