# capid

> Capability Unique Identifier

Latest version **1.0.0** (published 2015-02-16) · MIT license · 0 weekly downloads

## Install

```sh
npm install capid
pnpm add capid
yarn add capid
bun add capid
```

## Health

**Score 15/100 (F)** — status: abandoned.

Positive: no vulnerabilities.

Warnings: low downloads; no types; no esm support.

Negative: abandoned; low maintenance score.

## Facts

| | |
|---|---|
| Version | 1.0.0 |
| Published | 2015-02-16 |
| First published | 2015-02-16 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | none |
| Module format | CommonJS |
| Dependencies | 0 |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 0 |
| Maintainers | tristanls |

## Links

- npm: https://www.npmjs.com/package/capid
- Repository: git@github.com:tristanls/capid
- Homepage: https://github.com/tristanls/capid
- Issues: https://github.com/tristanls/capid/issues
- npm.io page: https://npm.io/package/capid

## Recent versions

- 1.0.0 (latest) — 2015-02-16

## README

# capid

_Stability: 3 - [Stable](https://github.com/tristanls/stability-index#stability-3---stable)_

Capability Unique Identifier generator.

## Contributors

[@tristanls](https://github.com/tristanls)

## Usage

```javascript
var capid = require('capid');
var id = capid(); // returns Buffer
```

## Overview

Given `N` number of possible identifiers and `n` random choices of identifiers, the expected number of choosing the same identifier at random is given by the formula `n * (1 - (1 - 1/N)^(n-1))`.

Let `N = 2^336` (42 bytes).

Let `n = 1e48` id's created. (for comparison: 4e20 is the number of milliseconds since the beginning of the Universe (13.8 billion years); 1e41 is the number of events you'd get if every millisecond since the beginning of the Universe generated 4e20 events).

The expected number of randomly assigning the same identifier for `n = 1e48` and `N = 2^336` is `0.000714`.

## Sources

* http://math.stackexchange.com/a/35798
* [N = 2^336, n = 1e48](http://www.wolframalpha.com/input/?i=10e48+%281+-+%281+-+1%2F%282%5E336%29%29%5E%28%2810e48%29-1%29%29)

---
_Source: https://npm.io/package/capid · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._