# Lo-Dash v0.1.0
Lo-Dash, from the devs behind [jsPerf.com](http://jsperf.com), is a drop-in replacement for Underscore.js that delivers [performance improvements](http://jsperf.com/lodash-underscore#filterby=family), bug fixes, and additional features.
Lo-Dash's performance is gained by avoiding slower native methods, instead opting for simplified non-ES5 compliant methods optimized for common usage, and by leveraging function compilation to reduce the number of overall function calls.
## Screencasts
For more information check out these screencasts over Lo-Dash:
* [Introducing Lo-Dash](http://dl.dropbox.com/u/513327/allyoucanleet/post/20/file/screencast.mp4)
* [Compiling and custom builds](http://dl.dropbox.com/u/513327/allyoucanleet/post/21/file/screencast.mp4)
## Documentation
The documentation for Lo-Dash can be viewed here:
Underscore's [documentation](http://documentcloud.github.com/underscore/) may also be used.
For a list of upcoming features, check out our [roadmap](https://github.com/bestiejs/lodash/wiki/Roadmap).
For a summary of bug fixes, changes, features, and optimizations, check out [/wiki/The-Low-Down](https://github.com/bestiejs/lodash/wiki/The-Low-Down).
## Features
Lo-Dash comes with AMD loader support, chainable [_.forEach](http://lodash.com/docs#_foreachcollection-callback--thisarg), lazy [_.bind](http://lodash.com/docs#_bindfunc--arg1-arg2-), [and more](https://github.com/bestiejs/lodash/wiki/The-Low-Down#wiki-features)...
## Custom builds
Custom builds make it easy to create lightweight versions of Lo-Dash containing only the methods you need.
We handle all the method dependency and alias mapping for you.
Custom builds may be created in two ways:
1. Use the`include` argument to pass the names of the methods to include in the build.
~~~ bash
node build include=each,filter,map,noConflict
node build include="each, filter, map, noConflict"
~~~
2. Use the `exclude` argument to pass the names of the methods to exclude from the build.
~~~ bash
node build exclude=isNaN,union,zip
node build exclude="isNaN, union, zip"
~~~
Custom builds are saved to `lodash.custom.js` and `lodash.custom.min.js`.
## Installation and usage
In a browser:
~~~ html
~~~
Via [npm](http://npmjs.org/):
~~~ bash
npm install lodash
~~~
In [Node.js](http://nodejs.org/) and [RingoJS v0.8.0+](http://ringojs.org/):
~~~ js
var _ = require('lodash');
~~~
In [Narwhal](http://narwhaljs.org/) and [RingoJS v0.7.0-](http://ringojs.org/):
~~~ js
var _ = require('lodash')._;
~~~
In [Rhino](http://www.mozilla.org/rhino/):
~~~ js
load('lodash.js');
~~~
In an AMD loader like [RequireJS](http://requirejs.org/):
~~~ js
// Lo-Dash is defined as an anonymous module so, through path mapping, it can be
// referenced as the "underscore" module
require({
'paths': {
'underscore': 'path/to/lodash'
}
},
['underscore'], function(_) {
console.log(_.VERSION);
});
~~~
## Cloning this repo
To clone this repository including all submodules, using Git 1.6.5 or later:
~~~ bash
git clone --recursive https://github.com/bestiejs/lodash.git
cd lodash.js
~~~
For older Git versions, just use:
~~~ bash
git clone https://github.com/bestiejs/lodash.git
cd lodash
git submodule update --init
~~~
Feel free to fork and send pull requests if you see improvements!
## Footnotes
* Lo-Dash has been tested in at least Chrome 5-19, Firefox 1.5-12, IE 6-9, Opera 9.25-11.64, Safari 3.0.4-5.1.3, Node.js 0.4.8-0.6.18, Narwhal 0.3.2, RingoJS 0.8, and Rhino 1.7RC3.
* Lo-Dash is part of the BestieJS *"Best in Class"* module collection. This means we promote solid browser/environment support, ES5 precedents, unit testing, and plenty of documentation.
## Author
* [John-David Dalton](http://allyoucanleet.com/)
[](https://twitter.com/jdalton "Follow @jdalton on Twitter")
## Contributors
* [Kit Cambridge](http://kitcambridge.github.com/)
[](https://twitter.com/kitcambridge "Follow @kitcambridge on Twitter")
* [Mathias Bynens](http://mathiasbynens.be/)
[](https://twitter.com/mathias "Follow @mathias on Twitter")