# Lo-Dash v1.3.1
A utility library delivering consistency, [customization](http://lodash.com/custom-builds), [performance](http://lodash.com/benchmarks), & [extras](http://lodash.com/#features).
## Download
* Modern builds:
[Development](https://raw.github.com/lodash/lodash/1.3.1/dist/lodash.js) &
[Production](https://raw.github.com/lodash/lodash/1.3.1/dist/lodash.min.js)
* Compatibility builds:
[Development](https://raw.github.com/lodash/lodash/1.3.1/dist/lodash.compat.js) &
[Production](https://raw.github.com/lodash/lodash/1.3.1/dist/lodash.compat.min.js)
* Underscore builds:
[Development](https://raw.github.com/lodash/lodash/1.3.1/dist/lodash.underscore.js) &
[Production](https://raw.github.com/lodash/lodash/1.3.1/dist/lodash.underscore.min.js)
CDN copies are available on [cdnjs](http://cdnjs.com/) & [jsDelivr](http://www.jsdelivr.com/#!lodash).
For smaller file sizes, create [custom builds](http://lodash.com/custom-builds) with only the features needed.
## Dive in
There’s plenty of [documentation](http://lodash.com/docs), [unit tests](http://lodash.com/tests), & [benchmarks](http://lodash.com/benchmarks).
For a list of upcoming features, check out our [roadmap](https://github.com/lodash/lodash/wiki/Roadmap).
## Features *not* in Underscore
* AMD loader support ([curl](https://github.com/cujojs/curl), [dojo](http://dojotoolkit.org/), [requirejs](http://requirejs.org/), etc.)
* [_(…)](http://lodash.com/docs#_) supports intuitive chaining
* [_.at](http://lodash.com/docs#at) for cherry-picking collection values
* [_.bindKey](http://lodash.com/docs#bindKey) for binding [*“lazy”*](http://michaux.ca/articles/lazy-function-definition-pattern) defined methods
* [_.cloneDeep](http://lodash.com/docs#cloneDeep) for deep cloning arrays & objects
* [_.contains](http://lodash.com/docs#contains) accepts a `fromIndex`
* [_.createCallback](http://lodash.com/docs#createCallback) for extending callbacks in methods & mixins
* [_.debounce](http://lodash.com/docs#debounce) & [_.throttle](http://lodash.com/docs#throttle) accept `options` for more control
* [_.findIndex](http://lodash.com/docs#findIndex) & [_.findKey](http://lodash.com/docs#findKey) for finding indexes & keys
* [_.forEach](http://lodash.com/docs#forEach) is chainable & supports exiting early
* [_.forIn](http://lodash.com/docs#forIn) for iterating own & inherited properties
* [_.forOwn](http://lodash.com/docs#forOwn) for iterating own properties
* [_.isPlainObject](http://lodash.com/docs#isPlainObject) for checking if values are created by `Object`
* [_.memoize](http://lodash.com/docs#memoize) exposes the `cache` of memoized functions
* [_.merge](http://lodash.com/docs#merge) for a deep [_.extend](http://lodash.com/docs#extend)
* [_.parseInt](http://lodash.com/docs#parseInt) for consistent behavior
* [_.partialRight](http://lodash.com/docs#partialRight) for [partial application](http://lodash.com/docs#partial) from the right
* [_.runInContext](http://lodash.com/docs#runInContext) for easier mocking
* [_.support](http://lodash.com/docs#support) for flagging environment features
* [_.template](http://lodash.com/docs#template) supports [*“imports”*](http://lodash.com/docs#templateSettings_imports) options & [ES6 template delimiters](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-7.8.6)
* [_.transform](http://lodash.com/docs#transform) as a powerful alternative to [_.reduce](http://lodash.com/docs#reduce) for transforming objects
* [_.unzip](http://lodash.com/docs#unzip) as the inverse of [_.zip](http://lodash.com/docs#zip)
* [_.where](http://lodash.com/docs#where) supports deep object comparisons
* [_.omit](http://lodash.com/docs#omit), [_.pick](http://lodash.com/docs#pick), &
[more](http://lodash.com/docs "_.assign, _.clone, _.cloneDeep, _.first, _.initial, _.isEqual, _.last, _.merge, _.rest") accept callbacks
* [_.contains](http://lodash.com/docs#contains), [_.toArray](http://lodash.com/docs#toArray), &
[more](http://lodash.com/docs "_.at, _.countBy, _.every, _.filter, _.find, _.forEach, _.forEachRight, _.groupBy, _.invoke, _.map, _.max, _.min, _.pluck, _.reduce, _.reduceRight, _.reject, _.shuffle, _.size, _.some, _.sortBy, _.where") accept strings
* [_.filter](http://lodash.com/docs#filter), [_.map](http://lodash.com/docs#map), &
[more](http://lodash.com/docs "_.countBy, _.every, _.find, _.findKey, _.findLast, _.findLastIndex, _.findLastKey, _.first, _.groupBy, _.initial, _.last, _.max, _.min, _.reject, _.rest, _.some, _.sortBy, _.sortedIndex, _.uniq") support *“_.pluck”* & *“_.where”* shorthands
## Resources
* Posts
- [Say “Hello” to Lo-Dash](http://kitcambridge.be/blog/say-hello-to-lo-dash/)
* Videos
- [Introduction](https://vimeo.com/44154599)
- [Origins](https://vimeo.com/44154600)
- [Optimizations & builds](https://vimeo.com/44154601)
- [Native method use](https://vimeo.com/48576012)
- [Testing](https://vimeo.com/45865290)
- [CascadiaJS ’12](http://www.youtube.com/watch?v=dpPy4f_SeEk)
## Support
Tested in Chrome 5~28, Firefox 2~22, IE 6-10, Opera 9.25~15, Safari 3-6, Node.js 0.4.8-0.10.15, Narwhal 0.3.2, PhantomJS 1.9.1, RingoJS 0.9, & Rhino 1.7RC5.
## Installation & usage
In browsers:
```html
```
Using [`npm`](http://npmjs.org/):
```bash
npm install lodash
npm install -g lodash
npm link lodash
```
In [Node.js](http://nodejs.org/) & [Ringo](http://ringojs.org/):
```js
var _ = require('lodash');
// or as an Underscore replacement
var _ = require('lodash/dist/lodash.underscore');
```
**Notes:**
* Don’t assign values to [special variable](http://nodejs.org/api/repl.html#repl_repl_features) `_` when in the REPL
* If Lo-Dash is installed globally, run [`npm link lodash`](http://blog.nodejs.org/2011/03/23/npm-1-0-global-vs-local-installation/) in your project’s root directory before requiring it
* Node.js 0.10.8-0.10.11 [have](https://github.com/joyent/node/issues/5622) [bugs](https://github.com/joyent/node/issues/5688) preventing minified builds
In [Rhino](http://www.mozilla.org/rhino/):
```js
load('lodash.js');
```
In an AMD loader:
```js
require({
'paths': { 'underscore': 'path/to/lodash' }
},
['underscore'], function(_) {
console.log(_.VERSION);
});
```
## Release Notes
### v1.3.1
* Added missing `cache` property to the objects returned by `getObject`
* Ensured `maxWait` unit tests pass in Ringo
* Increased the `maxPoolSize` value
* Optimized `releaseArray` & `releaseObject`
The full changelog is available [here](https://github.com/lodash/lodash/wiki/Changelog).
## BestieJS
Lo-Dash is part of the BestieJS *“Best in Class”* module collection. This means it promotes solid environment support, ES5+ precedents, unit testing, & plenty of documentation.
## Author
| [](http://twitter.com/jdalton "Follow @jdalton on Twitter") |
|---|
| [John-David Dalton](http://allyoucanleet.com/) |
## Contributors
| [](http://twitter.com/blainebublitz "Follow @BlaineBublitz on Twitter") | [](https://twitter.com/kitcambridge "Follow @kitcambridge on Twitter") | [](http://twitter.com/mathias "Follow @mathias on Twitter") |
|---|---|---|
| [Blaine Bublitz](http://iceddev.com/) | [Kit Cambridge](http://kitcambridge.github.io/) | [Mathias Bynens](http://mathiasbynens.be/) |