Skip to content
This repository
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 299 lines (238 sloc) 15.67 kb

Lo-Dash v0.6.1

A drop-in replacement* for Underscore.js, from the devs behind jsPerf.com, delivering performance, 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.

Download

Dive in

We’ve got API docs, benchmarks, and unit tests.

Create your own benchmarks at jsPerf, or search for existing ones.

For a list of upcoming features, check out our roadmap.

Screencasts

For more information check out these screencasts over Lo-Dash:

Features

Support

Lo-Dash has been tested in at least Chrome 5-21, Firefox 1-15, IE 6-9, Opera 9.25-12, Safari 3-6, Node.js 0.4.8-0.8.8, Narwhal 0.3.2, RingoJS 0.8, and Rhino 1.7RC5.

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.

  • Backbone builds, containing all methods required by Backbone, may be created using the backbone modifier argument.
lodash backbone
  • CSP builds, supporting default Content Security Policy restrictions, may be created using the csp modifier argument.
lodash csp
  • Legacy builds, tailored for older browsers without ES5 support, may be created using the legacy modifier argument.
lodash legacy
  • Mobile builds, with IE < 9 bug fixes and method compilation removed, may be created using the mobile modifier argument.
lodash mobile
  • Strict builds, with _.bindAll, _.defaults, and _.extend in strict mode, may be created using the strict modifier argument.
lodash strict
  • Underscore builds, containing only methods included in Underscore, may be created using the underscore modifier argument.
lodash underscore

Custom builds may be created in three ways:

  1. Use the category argument to pass the categories of methods to include in the build.
    Valid categories are “arrays”, “chaining”, “collections”, “functions”, “objects”, and “utilities”.
lodash category=collections,functions
lodash category="collections, functions"
  1. Use the exclude argument to pass the names of methods to exclude from the build.
lodash exclude=union,uniq,zip
lodash exclude="union, uniq, zip"
  1. Use the include argument to pass the names of methods to include in the build.
lodash include=each,filter,map
lodash include="each, filter, map"

All arguments, except backbone with underscore, exclude with include, and legacy with csp/mobile, may be combined.

lodash backbone legacy category=utilities exclude=first,last
lodash underscore mobile strict category=functions include=pick,uniq

The lodash command-line utility is available when Lo-Dash is installed as a global package (i.e. npm install -g lodash).

Custom builds are saved to lodash.custom.js and lodash.custom.min.js.

Installation and usage

In browsers:

<script src="lodash.js"></script>

Using npm:

npm install lodash
npm install -g lodash

In Node.js and RingoJS v0.8.0+:

var _ = require('lodash');

In RingoJS v0.7.0-:

var _ = require('lodash')._;

In Rhino:

load('lodash.js');

In an AMD loader like RequireJS:

require({
  'paths': {
    'underscore': 'path/to/lodash'
  }
},
['underscore'], function(_) {
  console.log(_.VERSION);
});

Resolved Underscore.js issues (20+)

  • Allow iteration of objects with a length property [#148, #154, #252, #448, #659, test]
  • Ensure array-like objects with invalid length properties are treated like regular objects [test]
  • Ensure “Arrays”, “Collections”, and “Objects” methods don’t error when passed falsey arguments [#650, test]
  • Ensure “Collections” methods allow string collection arguments [#247, #276, #561, test]
  • Fix cross-browser object iteration bugs [#60, #376, test]
  • Methods should work on pages with incorrectly shimmed native methods [#7, test]
  • Register as an AMD module, but still export to global [#431, test]
  • _(…) should return passed wrapper instances [test]
  • _.clone should allow deep cloning [#595, test]
  • _.contains should work with strings [#667, test]
  • _.countBy and _.groupBy should only add values to own, not inherited, properties [test]
  • _.extend should recursively extend objects [#379, #718, test]
  • _.forEach should be chainable [#142, test]
  • _.forEach should allow exiting iteration early [#211, test]
  • _.isElement should use strict equality for its duck type check [test]
  • _.isEmpty should support jQuery/MooTools DOM query collections [#690, test]
  • _.isEqual should return true for like-objects from different documents [test]
  • _.isObject should avoid V8 bug #2291 [#605, test]
  • _.isNaN(new Number(NaN)) should return true [test]
  • _.keys should work with arguments objects cross-browser [#396, test]
  • _.range should coerce arguments to numbers [#634, #683, test]
  • _.reduceRight should pass correct callback arguments when iterating objects [test]
  • _.sortedIndex should support arrays with high length values [test]
  • _.template should not augment the options object [test]
  • _.throttle should work when called in a loop [#502, test]
  • _.toArray uses custom toArray methods of arrays and strings [test]

Optimized methods (50+)

  • _.bind
  • _.bindAll
  • _.clone
  • _.compact
  • _.contains, _.include
  • _.defaults
  • _.defer
  • _.difference
  • _.each
  • _.every, _.all
  • _.extend
  • _.filter, _.select
  • _.find, _.detect
  • _.flatten
  • _.forEach, _.each
  • _.functions, _.methods
  • _.groupBy
  • _.indexOf
  • _.intersection
  • _.invert
  • _.invoke
  • _.isArguments
  • _.isDate
  • _.isEmpty
  • _.isFinite
  • _.isFunction
  • _.isObject
  • _.isNumber
  • _.isRegExp
  • _.isString
  • _.keys
  • _.lastIndexOf
  • _.map, _.collect
  • _.max
  • _.memoize
  • _.min
  • _.mixin
  • _.omit
  • _.pairs
  • _.pick
  • _.pluck
  • _.reduce, _.foldl, _.inject
  • _.reject
  • _.result
  • _.shuffle
  • _.some, _.any
  • _.sortBy
  • _.sortedIndex
  • _.template
  • _.throttle
  • _.times
  • _.toArray
  • _.union
  • _.uniq, _.unique
  • _.values
  • _.without
  • _.wrap
  • _.zip
  • plus all _(…) method wrappers

Release Notes

v0.6.1

  • Ensured IE conditional compilation isn’t enabled by the useSourceURL test
  • Optimized isPlainObject

v0.6.0

  • Added callback and thisArg arguments to _.drop and _.pick
  • Added hasObjectSpliceBug test to avoid delete operator use
  • Added _.omit alias for _.drop
  • Added _.unescape
  • Ensured _.reduce works with string objects in IE < 9
  • Made compiled methods take advantage of engines with strict mode optimizations
  • Optimized _.intersection and removed its dependency on _.every
  • Reduced the file size of the underscore build

The full changelog is available here.

BestieJS

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

Contributors

Something went wrong with that request. Please try again.