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John-David Dalton
2012-08-17 02:28:42 -07:00
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@@ -1,13 +1,13 @@
# Lo-Dash <sup>v0.5.0-rc.1</sup>
# Lo-Dash <sup>v0.5.0</sup>
A drop-in replacement<sup>[*](https://github.com/bestiejs/lodash/wiki/Drop-in-Disclaimer)</sup> 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).
A drop-in replacement<sup>[*](https://github.com/bestiejs/lodash/wiki/Drop-in-Disclaimer)</sup> for Underscore.js, from the devs behind [jsPerf.com](http://jsperf.com), delivering [performance](http://lodash.com/benchmarks), [bug fixes](https://github.com/bestiejs/lodash#closed-underscorejs-issues), and [additional features](https://github.com/bestiejs/lodash#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.
## Download
* [Development source](https://raw.github.com/bestiejs/lodash/v0.5.0-rc.1/lodash.js)
* [Production source](https://raw.github.com/bestiejs/lodash/v0.5.0-rc.1/lodash.min.js)
* [Development source](https://raw.github.com/bestiejs/lodash/v0.5.0/lodash.js)
* [Production source](https://raw.github.com/bestiejs/lodash/v0.5.0/lodash.min.js)
* CDN copies of ≤ [v0.4.2](http://cdnjs.cloudflare.com/ajax/libs/lodash.js/0.4.2/lodash.min.js) are available on [cdnjs](http://cdnjs.com/) thanks to [CloudFlare](http://www.cloudflare.com/)
* For optimal performance, [create a custom build](https://github.com/bestiejs/lodash#custom-builds) with only the features you need
@@ -32,26 +32,26 @@ For more information check out these screencasts over Lo-Dash:
* AMD loader support ([RequireJS](http://requirejs.org/), [curl.js](https://github.com/cujojs/curl), etc.)
* [_.bind](http://lodash.com/docs#bind) supports *"lazy"* binding
* [_.clone](https://github.com/bestiejs/lodash/tree/v0.5.0-rc.1/doc#_clonevalue-deep--guard-thorough) supports *"deep"* cloning
* [_.countBy](https://github.com/bestiejs/lodash/tree/v0.5.0-rc.1/doc#_countbycollection-callback--thisarg) as a compainion function for [_.groupBy](http://lodash.com/docs#groupBy) and [_.sortBy](http://lodash.com/docs#sortBy)
* [_.clone](http://lodash.com/docs#clone) supports *"deep"* cloning
* [_.countBy](http://lodash.com/docs#countBy) as a compainion function for [_.groupBy](http://lodash.com/docs#groupBy) and [_.sortBy](http://lodash.com/docs#sortBy)
* [_.debounce](http://lodash.com/docs#debounce)’ed functions match [_.throttle](http://lodash.com/docs#throttle)’ed functions’ return value behavior
* [_.drop](https://github.com/bestiejs/lodash/tree/v0.5.0-rc.1/doc#_dropobject--prop1-prop2-) for the inverse functionality of [_.pick](http://lodash.com/docs#pick)
* [_.drop](http://lodash.com/docs#drop) for the inverse functionality of [_.pick](http://lodash.com/docs#pick)
* [_.forEach](http://lodash.com/docs#forEach) is chainable and supports exiting iteration early
* [_.forIn](http://lodash.com/docs#forIn) for iterating over an object’s own and inherited properties
* [_.forOwn](http://lodash.com/docs#forOwn) for iterating over an object’s own properties
* [_.groupBy](http://lodash.com/docs#groupBy), [_.sortedIndex](http://lodash.com/docs#sortedIndex), and [_.uniq](http://lodash.com/docs#uniq) accept a `thisArg` argument
* [_.indexOf](http://lodash.com/docs#indexOf) and [_.lastIndexOf](http://lodash.com/docs#lastIndexOf) accept a `fromIndex` argument
* [_.merge](https://github.com/bestiejs/lodash/tree/v0.5.0-rc.1/doc#_mergeobject--source1-source2--indicator) for a *"deep"* [_.extend](http://lodash.com/docs#extend)
* [_.merge](http://lodash.com/docs#merge) for a *"deep"* [_.extend](http://lodash.com/docs#extend)
* [_.partial](http://lodash.com/docs#partial) for partial application without `this` binding
* [_.template](http://lodash.com/docs#template) utilizes [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl) for easier debugging
* [_.where](https://github.com/bestiejs/lodash/tree/v0.5.0-rc.1/doc#_wherecollection-properties) for filtering collections by contained properties
* [_.where](http://lodash.com/docs#where) for filtering collections by contained properties
* [_.zipObject](http://lodash.com/docs#zipObject) for composing objects
* [_.contains](http://lodash.com/docs#contains), [_.size](http://lodash.com/docs#size), [_.toArray](http://lodash.com/docs#toArray),
[and more…](http://lodash.com/docs "_.every, _.filter, _.find, _.forEach, _.groupBy, _.invoke, _.map, _.pluck, _.reduce, _.reduceRight, _.reject, _.some, _sortBy") accept strings
## Support
Lo-Dash has been tested in at least Chrome 5-21, Firefox 1.5-13, IE 6-9, Opera 9.25-12.01, Safari 3.0.4-6, Node.js 0.4.8-0.8.5, Narwhal 0.3.2, RingoJS 0.8, and Rhino 1.7RC3.
Lo-Dash has been tested in at least Chrome 5-21, Firefox 1.5-13, IE 6-9, Opera 9.25-12.01, Safari 3-6, Node.js 0.4.8-0.8.6, Narwhal 0.3.2, RingoJS 0.8, and Rhino 1.7RC3.
## Custom builds
@@ -166,36 +166,39 @@ require({
});
~~~
## Closed Underscore.js issues <sup>(20+)</sup>
## Resolved Underscore.js issues <sup>(20+)</sup>
* 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/v0.5.0-rc.1/test/test.js#L540-546)]
* Ensure array-like objects with invalid `length` properties are treated like regular objects [[test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L491-497)]
* Ensure *"Arrays"* methods allow falsey `array` arguments [[test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L1412-1450)]
* Ensure *"Collections"* methods allow string `collection` arguments [[#247](https://github.com/documentcloud/underscore/issues/247), [#276](https://github.com/documentcloud/underscore/issues/276), [#561](https://github.com/documentcloud/underscore/pull/561), [test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L499-517)]
* Ensure templates compiled with errors are inspectable [[#666](https://github.com/documentcloud/underscore/issues/666), [test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L1157-1160)]
* Fix cross-browser object iteration bugs [[#60](https://github.com/documentcloud/underscore/issues/60), [#376](https://github.com/documentcloud/underscore/issues/376), [test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L551-576)]
* 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/v0.5.0/test/test.js#L544-550)]
* Ensure array-like objects with invalid `length` properties are treated like regular objects [[test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L491-501)]
* Ensure *"Arrays"* methods allow falsey `array` arguments [[test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L1487-1525)]
* Ensure *"Collections"* methods allow string `collection` arguments [[#247](https://github.com/documentcloud/underscore/issues/247), [#276](https://github.com/documentcloud/underscore/issues/276), [#561](https://github.com/documentcloud/underscore/pull/561), [test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L503-521)]
* Ensure templates compiled with errors are inspectable [[#666](https://github.com/documentcloud/underscore/issues/666), [test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L1232-1235)]
* Fix cross-browser object iteration bugs [[#60](https://github.com/documentcloud/underscore/issues/60), [#376](https://github.com/documentcloud/underscore/issues/376), [test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L555-580)]
* Handle arrays with `undefined` values correctly in IE < 9 [[#601](https://github.com/documentcloud/underscore/issues/601)]
* 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/v0.5.0-rc.1/test/test.js#L117-123)]
* Register as an AMD module, but still export to global [[#431](https://github.com/documentcloud/underscore/pull/431), [test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L101-115)]
* `_(…)` should return passed wrapper instances [[test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L135-138)]
* `_.clone` should allow `deep` cloning [[#595](https://github.com/documentcloud/underscore/pull/595), [test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L197-212)]
* `_.contains` should work with strings [[#667](https://github.com/documentcloud/underscore/pull/667), [test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L267-276)]
* `_.escape` should return an empty string when passed `null` or `undefined` [[#407](https://github.com/documentcloud/underscore/issues/427), [test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L367-370)]
* `_.extend` should recursively extend objects [[#379](https://github.com/documentcloud/underscore/pull/379), [test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L851-873)]
* `_.forEach` should be chainable [[#142](https://github.com/documentcloud/underscore/issues/142), [test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L486-489)]
* `_.forEach` should exit iteration early [[#211](https://github.com/documentcloud/underscore/issues/211), [test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L578-597)]
* `_.groupBy` should add values to own, not inherited, properties [[test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L612-619)]
* `_.isEqual` should return `true` for like-objects from different documents [[test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L746-766)]
* `_.isNaN(new Number(NaN))` should return `true` [[test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L774-776)]
* `_.keys` and `_.size` should work with `arguments` objects cross-browser [[#396](https://github.com/documentcloud/underscore/issues/396), [#653](https://github.com/documentcloud/underscore/issues/653), [test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L786-788), [test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L1083-1085)]
* `_.range` should coerce arguments to numbers [[#634](https://github.com/documentcloud/underscore/issues/634), [#683](https://github.com/documentcloud/underscore/issues/683), [test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L996-999)]
* `_.reduceRight` should pass correct callback arguments when iterating objects [[test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L1007-1021)]
* `_.size` should return the `length` of string values [[test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L1066-1068)]
* `_.size` shouldn’t error on falsey values [[#650](https://github.com/documentcloud/underscore/pull/650), [test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L1070-1077)]
* `_.sortedIndex` should support arrays with high `length` values [[test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L1127-1136)]
* `_.template` should not augment the `options` object [[test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L1151-1155)]
* `_.throttle` should work when called in a loop [[#502](https://github.com/documentcloud/underscore/issues/502), [test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L1247-1257)]
* `_.zipObject` should accept less than two arguments [[test](https://github.com/bestiejs/lodash/blob/v0.5.0-rc.1/test/test.js#L1374-1376)]
* 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/v0.5.0/test/test.js#L117-123)]
* Register as an AMD module, but still export to global [[#431](https://github.com/documentcloud/underscore/pull/431), [test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L101-115)]
* `_(…)` should return passed wrapper instances [[test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L135-138)]
* `_.clone` should allow `deep` cloning [[#595](https://github.com/documentcloud/underscore/pull/595), [test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L197-212)]
* `_.contains` should work with strings [[#667](https://github.com/documentcloud/underscore/pull/667), [test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L267-276)]
* `_.escape` should return an empty string when passed `null` or `undefined` [[#407](https://github.com/documentcloud/underscore/issues/427), [test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L367-370)]
* `_.extend` should recursively extend objects [[#379](https://github.com/documentcloud/underscore/pull/379), [test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L862-920)]
* `_.forEach` should be chainable [[#142](https://github.com/documentcloud/underscore/issues/142), [test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L486-489)]
* `_.forEach` should allow exiting iteration early [[#211](https://github.com/documentcloud/underscore/issues/211), [test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L582-601)]
* `_.groupBy` should add values to own, not inherited, properties [[test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L616-623)]
* `_.isEmpty` and `_.size` should support jQuery/MooTools DOM query collections [[#690](https://github.com/documentcloud/underscore/pull/690), [test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L716-721)]
* `_.isEqual` should return `true` for like-objects from different documents [[test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L757-777)]
* `_.isObject` should avoid V8 bug [#2291](http://code.google.com/p/v8/issues/detail?id=2291) [[#605](https://github.com/documentcloud/underscore/issues/605), [test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L785-797)]
* `_.isNaN(new Number(NaN))` should return `true` [[test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L805-807)]
* `_.keys` and `_.size` should work with `arguments` objects cross-browser [[#396](https://github.com/documentcloud/underscore/issues/396), [#653](https://github.com/documentcloud/underscore/issues/653), [test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L817-819)]
* `_.once` should free the given function for garbage collection [[#693](https://github.com/documentcloud/underscore/pull/693)]
* `_.range` should coerce arguments to numbers [[#634](https://github.com/documentcloud/underscore/issues/634), [#683](https://github.com/documentcloud/underscore/issues/683), [test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L1042-1045)]
* `_.reduceRight` should pass correct callback arguments when iterating objects [[test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L1053-1067)]
* `_.size` should return the `length` of string values [[test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L1112-1114)]
* `_.size` shouldn’t error on falsey values [[#650](https://github.com/documentcloud/underscore/pull/650), [test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L1116-1123)]
* `_.sortedIndex` should support arrays with high `length` values [[test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L1202-1211)]
* `_.template` should not augment the `options` object [[test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L1226-1230)]
* `_.throttle` should work when called in a loop [[#502](https://github.com/documentcloud/underscore/issues/502), [test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L1322-1332)]
* `_.zipObject` should accept less than two arguments [[test](https://github.com/bestiejs/lodash/blob/v0.5.0/test/test.js#L1449-1451)]
## Optimized methods <sup>(50+)</sup>
@@ -259,19 +262,24 @@ require({
## Release Notes
### <sup>v0.5.0-rc.1</sup>
### <sup>v0.5.0</sup>
* Added [_.countBy](https://github.com/bestiejs/lodash/tree/v0.5.0-rc.1/doc#_countbycollection-callback--thisarg), [_.drop](https://github.com/bestiejs/lodash/tree/v0.5.0-rc.1/doc#_dropobject--prop1-prop2-), [_.merge](https://github.com/bestiejs/lodash/tree/v0.5.0-rc.1/doc#_mergeobject--source1-source2--indicator), and [_.where](https://github.com/bestiejs/lodash/tree/v0.5.0-rc.1/doc#_wherecollection-properties)
* Added [_.countBy](http://lodash.com/docs#countBy), [_.drop](http://lodash.com/docs#drop), [_.merge](http://lodash.com/docs#merge), and [_.where](http://lodash.com/docs#where)
* Added `csp` *(Content Security Policy)* and `underscore` build options
* Added `deep` cloning support to `_.clone`
* Added [Jam](http://jamjs.org/) package support
* Added support for exiting `_.forEach`, `_.forIn`, and `_.forOwn` early by returning `false` in the `callback`
* Added support for jQuery/MooTools DOM query collections to `_.isEmpty` and `_.size`
* Ensured development build works with IE conditional compilation enabled
* Ensured `_.clone` doesn't clone functions, DOM nodes, `arguments` objects, and objects created by constructors other than `Object`
* Ensured `_.filter`’s `callback` can't modify result values
* Ensured `_.isEmpty`, `_.isEquals`, and `_.size` support `arguments` objects
* Ensured `_.isEqual` doesn't inspect DOM nodes, works with objects from other documents, and calls custom `isEqual` methods before checking strict equality
* Ensured `_.once` frees the given function for garbage collection
* Ensured `_.sortBy` performs a stable sort
* Ensured `reEvaluateDelimiter` is assigned when `_.templateSettings.evaluate` is undefined
* Made `_.range` coerce arguments to numbers
* Optimized `_.isFunction`
The full changelog is available [here](https://github.com/bestiejs/lodash/wiki/Changelog).