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