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Lo-Dash v0.3.2

A drop-in replacement for Underscore.js, from the devs behind jsPerf.com, that delivers performance improvements, 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.

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Dive in

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

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 5-19, 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.

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.
node build backbone
  • Mobile builds, with IE bug fixes and method compilation removed, may be created using the mobile modifier argument.
node build mobile

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".
node build category=collections,functions
node build category="collections, functions"
  1. Use the include argument to pass the names of methods to include in the build.
node build include=each,filter,map
node build include="each, filter, map"
  1. Use the exclude argument to pass the names of methods to exclude from the build.
node build exclude=union,uniq,zip
node build exclude="union, uniq, zip"

All arguments, except include and exlcude, may be combined.

node build backbone mobile category=functions include=pick,uniq
node build backbone mobile category=utilities exclude=first,last

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

In Node.js and RingoJS v0.8.0+:

var _ = require('lodash');

In Narwhal and 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);
});

Cloning this repo

To clone this repository including all submodules, using Git 1.6.5 or later:

git clone --recursive https://github.com/bestiejs/lodash.git
cd lodash.js

For older Git versions, just use:

git clone https://github.com/bestiejs/lodash.git
cd lodash
git submodule update --init

Closed Underscore.js issues

  • Allow iteration of objects with a length property [#148, #154, #252, #448, test]
  • Ensure "Arrays" category methods allow falsey array arguments [test]
  • Ensure array-like objects with invalid length properties are treated like regular objects [test, test, test]
  • Ensure _(…) returns passed wrapper instances [test]
  • Ensure _.escape returns an empty string when passed null or undefined [#407, test]
  • Ensure _.groupBy adds values to own, not inherited, properties [test]
  • Ensure _.sortedIndex supports arrays with high length values [test]
  • Ensure _.throttle works when called in tight loops [#502, test]
  • Fix Firefox, IE, Opera, and Safari object iteration bugs [#376, test, test, test, test, test, test]
  • Handle arrays with undefined values correctly in IE < 9 [#601]
  • Methods should work on pages with incorrectly shimmed native methods [#7, test]
  • Register as AMD module, but still export to global [#431, test]
  • _.forEach should be chainable [#142, test]
  • _isNaN(new Number(NaN)) should return true [test]
  • _.reduceRight should pass correct callback arguments when iterating objects [test]
  • _.size should return the length of string values [test]

Optimized methods (50+)

  • _.bind
  • _.bindAll
  • _.clone
  • _.compact
  • _.contains, _.include
  • _.defaults
  • _.defer
  • _.difference
  • _.each
  • _.escape
  • _.every, _.all
  • _.extend
  • _.filter, _.select
  • _.find, _.detect
  • _.flatten
  • _.forEach, _.each
  • _.functions, _.methods
  • _.groupBy
  • _.indexOf
  • _.intersection
  • _.invoke
  • _.isEmpty
  • _.isEqual
  • _.isFinite
  • _.isObject
  • _.isString
  • _.keys
  • _.lastIndexOf
  • _.map, _.collect
  • _.max
  • _.memoize
  • _.min
  • _.mixin
  • _.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

v0.3.2

  • Deprecated _(…).chain, _.isFinite, _.isNaN, _.isNull, _.isUndefined, _.result, and _.size
  • Ensured _.escape returns an empty string when passed null or undefined
  • Ensured sourceURL support doesn't cause errors in Adobe's JS engine.
  • Fixed regression in generating custom builds
  • Moved _.invoke and _.pluck back to the "Collections" category
  • Moved _.tap to the "Chaining" category

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

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