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The MIT License (MIT)
Copyright (c) 2015 Unshift.io, Arnout Kazemier, the Contributors.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# yeast
[![Made by unshift](https://img.shields.io/badge/made%20by-unshift-00ffcc.svg?style=flat-square)](http://unshift.io)[![Version npm](https://img.shields.io/npm/v/yeast.svg?style=flat-square)](http://browsenpm.org/package/yeast)[![Build Status](https://img.shields.io/travis/unshiftio/yeast/master.svg?style=flat-square)](https://travis-ci.org/unshiftio/yeast)[![Dependencies](https://img.shields.io/david/unshiftio/yeast.svg?style=flat-square)](https://david-dm.org/unshiftio/yeast)[![Coverage Status](https://img.shields.io/coveralls/unshiftio/yeast/master.svg?style=flat-square)](https://coveralls.io/r/unshiftio/yeast?branch=master)[![IRC channel](https://img.shields.io/badge/IRC-irc.freenode.net%23unshift-00a8ff.svg?style=flat-square)](https://webchat.freenode.net/?channels=unshift)
[![Sauce Test Status](https://saucelabs.com/browser-matrix/yeast.svg)](https://saucelabs.com/u/yeast)
Yeast is a unique id generator. It has been primarily designed to generate a
unique id which can be used for cache busting. A common practice for this is
to use a timestamp, but there are couple of downsides when using timestamps.
1. The timestamp is already 13 chars long. This might not matter for 1 request
but if you make hundreds of them this quickly adds up in bandwidth and
processing time.
2. It's not unique enough. If you generate two stamps right after each other,
they would be identical because the timing accuracy is limited to
milliseconds.
Yeast solves both of these issues by:
1. Compressing the generated timestamp using a custom `encode()` function that
returns a string representation of the number.
2. Seeding the id in case of collision (when the id is identical to the previous
one).
To keep the strings unique it will use the `.` char to separate the generated
stamp from the seed.
## Installation
The module is intended to be used in browsers as well as in Node.js and is
therefore released in the npm registry and can be installed using:
```
npm install --save yeast
```
## Usage
All the examples assume that this library is initialized as follow:
```js
'use strict';
var yeast = require('yeast');
```
To generate an id just call the `yeast` function.
```js
console.log(yeast(), yeast(), yeast()); // outputs: KyxidwN KyxidwN.0 KyxidwN.1
setTimeout(function () {
console.log(yeast()); // outputs: KyxidwO
});
```
### yeast.encode(num)
An helper function that returns a string representing the specified number. The
returned string contains only URL safe characters.
```js
yeast.encode(+new Date()); // outputs: Kyxjuo1
```
### yeast.decode(str)
An helper function that returns the integer value specified by the given string.
This function can be used to retrieve the timestamp from a `yeast` id.
```js
var id = yeast(); // holds the value: Kyxl1OU
yeast.decode(id); // outputs: 1439816226334
```
That's all folks. If you have ideas on how we can further compress the ids
please open an issue!
## License
[MIT](LICENSE)

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'use strict';
var alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_'.split('')
, length = 64
, map = {}
, seed = 0
, i = 0
, prev;
/**
* Return a string representing the specified number.
*
* @param {Number} num The number to convert.
* @returns {String} The string representation of the number.
* @api public
*/
function encode(num) {
var encoded = '';
do {
encoded = alphabet[num % length] + encoded;
num = Math.floor(num / length);
} while (num > 0);
return encoded;
}
/**
* Return the integer value specified by the given string.
*
* @param {String} str The string to convert.
* @returns {Number} The integer value represented by the string.
* @api public
*/
function decode(str) {
var decoded = 0;
for (i = 0; i < str.length; i++) {
decoded = decoded * length + map[str.charAt(i)];
}
return decoded;
}
/**
* Yeast: A tiny growing id generator.
*
* @returns {String} A unique id.
* @api public
*/
function yeast() {
var now = encode(+new Date());
if (now !== prev) return seed = 0, prev = now;
return now +'.'+ encode(seed++);
}
//
// Map each character to its index.
//
for (; i < length; i++) map[alphabet[i]] = i;
//
// Expose the `yeast`, `encode` and `decode` functions.
//
yeast.encode = encode;
yeast.decode = decode;
module.exports = yeast;

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{
"_args": [
[
"yeast@0.1.2",
"/Users/tatiana/selfdefined"
]
],
"_from": "yeast@0.1.2",
"_id": "yeast@0.1.2",
"_inBundle": false,
"_integrity": "sha1-AI4G2AlDIMNy28L47XagymyKxBk=",
"_location": "/yeast",
"_phantomChildren": {},
"_requested": {
"type": "version",
"registry": true,
"raw": "yeast@0.1.2",
"name": "yeast",
"escapedName": "yeast",
"rawSpec": "0.1.2",
"saveSpec": null,
"fetchSpec": "0.1.2"
},
"_requiredBy": [
"/engine.io-client",
"/socket.io/engine.io-client"
],
"_resolved": "https://registry.npmjs.org/yeast/-/yeast-0.1.2.tgz",
"_spec": "0.1.2",
"_where": "/Users/tatiana/selfdefined",
"author": {
"name": "Arnout Kazemier"
},
"bugs": {
"url": "https://github.com/unshiftio/yeast/issues"
},
"description": "Tiny but linear growing unique id generator",
"devDependencies": {
"assume": "1.3.x",
"istanbul": "0.3.x",
"mocha": "2.3.x",
"pre-commit": "1.1.x",
"zuul": "3.4.x"
},
"homepage": "https://github.com/unshiftio/yeast",
"keywords": [
"yeast",
"id",
"generator",
"unique"
],
"license": "MIT",
"main": "index.js",
"name": "yeast",
"repository": {
"type": "git",
"url": "git+https://github.com/unshiftio/yeast.git"
},
"scripts": {
"100%": "istanbul check-coverage --statements 100 --functions 100 --lines 100 --branches 100",
"coverage": "istanbul cover _mocha -- test.js",
"test": "mocha test.js",
"test-browser": "zuul -- test.js",
"test-node": "istanbul cover _mocha --report lcovonly -- test.js",
"watch": "mocha --watch test.js"
},
"version": "0.1.2"
}