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254 lines
12 KiB
Markdown
254 lines
12 KiB
Markdown
# Lo-Dash <sup>v0.3.2</sup>
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A drop-in replacement for Underscore.js, from the devs behind [jsPerf.com](http://jsperf.com), that delivers [performance improvements](http://lodash.com/benchmarks), [bug fixes](https://github.com/bestiejs/lodash#closed-underscorejs-issues), and [additional features](https://github.com/bestiejs/lodash#features).
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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.
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## Download
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* [Development source](https://raw.github.com/bestiejs/lodash/v0.3.2/lodash.js)
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* [Production source](https://raw.github.com/bestiejs/lodash/v0.3.2/lodash.min.js)
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* Available on [cdnjs](http://cdnjs.cloudflare.com/ajax/libs/lodash.js/0.3.2/lodash.min.js) thanks to [CloudFlare](http://www.cloudflare.com/)
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* For optimal performance, [create a custom build](https://github.com/bestiejs/lodash#custom-builds) with only the features you need
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## Dive in
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We’ve got [API docs](http://lodash.com/docs), [benchmarks](http://lodash.com/benchmarks), and [unit tests](http://lodash.com/tests).
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Create your own benchmarks at [jsPerf](http://jsperf.com), or [search](http://jsperf.com/search?q=lodash) for existing ones.
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For a list of upcoming features, check out our [roadmap](https://github.com/bestiejs/lodash/wiki/Roadmap).
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## Screencasts
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For more information check out these screencasts over Lo-Dash:
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* [Introducing Lo-Dash](https://vimeo.com/44154599)
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* [Optimizations and custom builds](https://vimeo.com/44154601)
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* [Lo-Dash’s origin and why it’s a better utility belt](https://vimeo.com/44154600)
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## Features
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* AMD loader support ([RequireJS](http://requirejs.org/), [curl.js](https://github.com/cujojs/curl), etc.)
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* [_.bind](http://lodash.com/docs#bind) supports *"lazy"* binding
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* [_.debounce](http://lodash.com/docs#debounce)’ed functions match [_.throttle](http://lodash.com/docs#throttle)’ed functions’ return value behavior
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* [_.forEach](http://lodash.com/docs#forEach) is chainable
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* [_.forIn](http://lodash.com/docs#forIn) for iterating over an object’s own and inherited properties
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* [_.forOwn](http://lodash.com/docs#forOwn) for iterating over an object’s own properties
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* [_.groupBy](http://lodash.com/docs#groupBy), [_.sortedIndex](http://lodash.com/docs#sortedIndex), and [_.uniq](http://lodash.com/docs#uniq) accept a `thisArg` argument
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* [_.indexOf](http://lodash.com/docs#indexOf) and [_.lastIndexOf](http://lodash.com/docs#lastIndexOf) accept a `fromIndex` argument
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* [_.partial](http://lodash.com/docs#partial) for more functional fun
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* [_.size](http://lodash.com/docs#size) supports returning the `length` of string values
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* [_.template](http://lodash.com/docs#template) utilizes [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl) for easier debugging
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## Support
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Lo-Dash has been tested in at least Chrome 5-19, Firefox 1.5-13, IE 6-9, Opera 9.25-12, 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.
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## Custom builds
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Custom builds make it easy to create lightweight versions of Lo-Dash containing only the methods you need.
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We handle all the method dependency and alias mapping for you.
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* Backbone builds, containing all methods required by Backbone, may be created using the `backbone` modifier argument.
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~~~ bash
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node build backbone
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~~~
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* Legacy builds, tailored for older browsers without [ES5 support](http://es5.github.com/), may be created using the `legacy` modifier argument.
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~~~ bash
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node build legacy
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~~~
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* Mobile builds, with IE bug fixes and method compilation removed, may be created using the `mobile` modifier argument.
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~~~ bash
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node build mobile
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~~~
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Custom builds may be created in three ways:
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1. Use the `category` argument to pass the categories of methods to include in the build.<br>
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Valid categories are *"arrays"*, *"chaining"*, *"collections"*, *"functions"*, *"objects"*, and *"utilities"*.
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~~~ bash
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node build category=collections,functions
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node build category="collections, functions"
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~~~
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2. Use the `include` argument to pass the names of methods to include in the build.
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~~~ bash
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node build include=each,filter,map
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node build include="each, filter, map"
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~~~
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3. Use the `exclude` argument to pass the names of methods to exclude from the build.
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~~~ bash
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node build exclude=union,uniq,zip
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node build exclude="union, uniq, zip"
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~~~
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All arguments, except `include` with `exclude` and `mobile` with `legacy`, may be combined.
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~~~ bash
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node build backbone mobile category=functions include=pick,uniq
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node build backbone legacy category=utilities exclude=first,last
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~~~
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Custom builds are saved to `lodash.custom.js` and `lodash.custom.min.js`.
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## Installation and usage
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In browsers:
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~~~ html
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<script src="lodash.js"></script>
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or use the CDN:
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<script src="http://cdnjs.cloudflare.com/ajax/libs/lodash.js/0.3.2/lodash.min.js"></script>
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~~~
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Using [npm](http://npmjs.org/):
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~~~ bash
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npm install lodash
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~~~
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In [Node.js](http://nodejs.org/) and [RingoJS v0.8.0+](http://ringojs.org/):
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~~~ js
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var _ = require('lodash');
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~~~
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In [Narwhal](http://narwhaljs.org/) and [RingoJS v0.7.0-](http://ringojs.org/):
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~~~ js
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var _ = require('lodash')._;
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~~~
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In [Rhino](http://www.mozilla.org/rhino/):
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~~~ js
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load('lodash.js');
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~~~
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In an AMD loader like [RequireJS](http://requirejs.org/):
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~~~ js
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require({
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'paths': {
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'underscore': 'path/to/lodash'
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}
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},
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['underscore'], function(_) {
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console.log(_.VERSION);
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});
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~~~
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## Closed Underscore.js issues
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* Allow iteration of objects with a `length` property [[#148](https://github.com/documentcloud/underscore/issues/148), [#154](https://github.com/documentcloud/underscore/issues/154), [#252](https://github.com/documentcloud/underscore/issues/252), [#448](https://github.com/documentcloud/underscore/issues/448), [#659](https://github.com/documentcloud/underscore/issues/659), [test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L271-276)]
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* Ensure "Arrays" category methods allow falsey `array` arguments [[test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L758-790)]
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* Ensure array-like objects with invalid `length` properties are treated like regular objects [[test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L242-248), [test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L560-569), [test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L705-708)]
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* Ensure `_(…)` returns passed wrapper instances [[test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L106-109)]
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* Ensure `_.escape` returns an empty string when passed `null` or `undefined` [[#407](https://github.com/documentcloud/underscore/issues/427), [test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L161-164)]
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* Ensure `_.groupBy` adds values to own, not inherited, properties [[test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L322-329)]
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* Ensure `_.sortedIndex` supports arrays with high `length` values [[test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L613-622)]
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* Ensure `_.throttle` works when called in tight loops [[#502](https://github.com/documentcloud/underscore/issues/502), [test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L656-666)]
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* Fix Firefox, IE, Opera, and Safari object iteration bugs [[#376](https://github.com/documentcloud/underscore/issues/376), [test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L180-192), [test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L282-307), [test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L395-406), [test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L414-416), [test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L434-454), [test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L581-583)]
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* Handle arrays with `undefined` values correctly in IE < 9 [[#601](https://github.com/documentcloud/underscore/issues/601)]
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* Methods should work on pages with incorrectly shimmed native methods [[#7](https://github.com/documentcloud/underscore/issues/7), [test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L88-94)]
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* Register as AMD module, but still export to global [[#431](https://github.com/documentcloud/underscore/pull/431), [test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L72-86)]
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* `_.forEach` should be chainable [[#142](https://github.com/documentcloud/underscore/issues/142), [test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L237-240)]
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* `_isNaN(new Number(NaN))` should return `true` [[test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L424-426)]
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* `_.reduceRight` should pass correct callback arguments when iterating objects [[test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L548-558)]
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* `_.size` should return the `length` of string values [[test](https://github.com/bestiejs/lodash/blob/1ba47a7c2a35552796f0c75dc2b46660e230f842/test/test.js#L577-579)]
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## Optimized methods <sup>(50+)</sup>
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* `_.bind`
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* `_.bindAll`
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* `_.clone`
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* `_.compact`
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* `_.contains`, `_.include`
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* `_.defaults`
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* `_.defer`
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* `_.difference`
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* `_.each`
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* `_.escape`
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* `_.every`, `_.all`
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* `_.extend`
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* `_.filter`, `_.select`
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* `_.find`, `_.detect`
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* `_.flatten`
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* `_.forEach`, `_.each`
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* `_.functions`, `_.methods`
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* `_.groupBy`
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* `_.indexOf`
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* `_.intersection`
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* `_.invoke`
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* `_.isArguments`
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* `_.isDate`
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* `_.isEmpty`
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* `_.isEqual`
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* `_.isFinite`
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* `_.isFunction`
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* `_.isObject`
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* `_.isNumber`
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* `_.isRegExp`
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* `_.isString`
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* `_.keys`
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* `_.lastIndexOf`
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* `_.map`, `_.collect`
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* `_.max`
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* `_.memoize`
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* `_.min`
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* `_.mixin`
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* `_.pick`
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* `_.pluck`
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* `_.reduce`, `_.foldl`, `_.inject`
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* `_.reject`
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* `_.result`
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* `_.shuffle`
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* `_.some`, `_.any`
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* `_.sortBy`
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* `_.sortedIndex`
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* `_.template`
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* `_.throttle`
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* `_.times`
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* `_.toArray`
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* `_.union`
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* `_.uniq`, `_.unique`
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* `_.values`
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* `_.without`
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* `_.wrap`
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* `_.zip`
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* plus all `_(…)` method wrappers
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## Release Notes
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### <sup>v0.3.2</sup>
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* Deprecated `_(…).chain`, `_.isFinite`, `_.isNaN`, `_.isNull`, `_.isUndefined`, `_.result`, and `_.size`
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* Ensured `_.escape` returns an empty string when passed `null` or `undefined`
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* Ensured `sourceURL` support doesn't cause errors in Adobe's JS engine.
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* Fixed regression in generating custom builds
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* Moved `_.invoke` and `_.pluck` back to the *"Collections"* category
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* Moved `_.tap` to the *"Chaining"* category
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The full changelog is available [here](https://github.com/bestiejs/lodash/wiki/Changelog).
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## BestieJS
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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.
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## Author
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* [John-David Dalton](http://allyoucanleet.com/)
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[](https://twitter.com/jdalton "Follow @jdalton on Twitter")
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## Contributors
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* [Kit Cambridge](http://kitcambridge.github.com/)
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[](https://twitter.com/kitcambridge "Follow @kitcambridge on Twitter")
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* [Mathias Bynens](http://mathiasbynens.be/)
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[](https://twitter.com/mathias "Follow @mathias on Twitter")
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