gerhobbelt / lodash

A drop-in replacement for Underscore.js that delivers performance improvements, bug fixes, and additional features.

Lo-Dash v2.4.1

A utility library delivering consistency, customization, performance, & extras.

Download

Check out our wiki for details over the differences between builds.

• Modern build (minified) perfect for new environments
  (Chrome ≥ 14, Firefox ≥ 10, IE ≥ 9, Node.js, Opera ≥ 12, Safari ≥ 5.1)
• Compatibility build (minified) for old environments too
• Underscore build (minified) as a drop-in replacement for Underscore v1.6.0

CDN copies are available on cdnjs & jsDelivr. For smaller file sizes, create custom builds with only the features needed.

Love modules? We’ve got you covered with lodash-amd, lodash-es6, lodash-node, & npm packages per method.

Dive in

There’s plenty of API documentation, unit tests, & benchmarks.
Check out DevDocs; a fast, organized, & searchable interface for our documentation.

The full changelog for this release is available on our wiki.
A list of upcoming features is available on our roadmap.

Features not in Underscore

• ~100% code coverage
• Module bundles for AMD & Node.js as well as npm packages
• Follows semantic versioning for releases
• _(…) supports intuitive chaining
• _.at for cherry-picking collection values
• _.bindKey for binding “lazy” defined methods
• _.clone supports shallow cloning of Date & RegExp objects
• _.cloneDeep for deep cloning arrays & objects
• _.contains accepts a fromIndex
• _.create for easier object inheritance
• _.callback for extending callbacks in methods & mixins
• _.curry for creating curried functions
• _.debounce & _.throttle accept additional options for more control
• _.findIndex & _.findKey for finding indexes & keys
• _.forEach supports exiting early
• _.forIn for iterating own & inherited properties
• _.forOwn for iterating own properties
• _.isError to check for error objects
• _.isPlainObject to check for objects created by Object
• _.keysIn & _.valuesIn for keys and values of own & inherited properties
• _.mapValues for mapping values to an object
• _.memoize exposes the cache of memoized functions
• _.merge for a deep _.extend
• _.negate to create negated predicate functions
• _.noop for function placeholders
• _.parseInt for consistent behavior
• _.pull, _.pullAt, & _.remove for mutating arrays
• _.random supports returning floating-point numbers
• _.runInContext for easier mocking
• _.slice for creating subsets of array-like values
• _.sortBy supports sorting by multiple properties
• _.support for flagging environment features
• _.template supports “imports” options & ES6 template delimiters
• _.transform as a powerful alternative to _.reduce for transforming objects
• _.where supports deep object comparisons
• _.xor to complement _.difference, _.intersection, & _.union
• _.zip is capable of unzipping values
• _.bind, _.curry, _.partial, & more support argument placeholders
• _.capitalize, _.trim, & more string methods
• _.contains, _.toArray, & more accept strings
• _.dropWhile, _.takeWhile, & more to complement _.first, _.initial, _.last, & _.rest
• _.filter, _.map, & more support “_.pluck” & “_.where” shorthands
• _.findLast, _.findLastIndex, & more right-associative methods
• _.omit, _.pick, & more accept callbacks

Resources

• Podcasts

• JavaScript Jabber

• Posts

• Say “Hello” to Lo-Dash
• Custom builds in Lo-Dash 2.0

• Videos

• Introduction
• Origins
• Optimizations & builds
• Native method use
• Testing
• CascadiaJS ’12

A list of other community created podcasts, posts, & videos is available on our wiki.

Support

Tested in Chrome (19, 33-34), Firefox (3, 20, 28-29), IE 6-11, Opera (10, 12, 19-20), Safari 5-7, Node.js 0.6.21~0.10.28, Narwhal 0.3.2, PhantomJS 1.9.2, RingoJS 0.9, & Rhino 1.7RC5.

Automated browser test results are available as well as Travis CI builds for lodash, lodash-cli, lodash-amd, lodash-node, & grunt-lodash.

Special thanks to Sauce Labs for providing automated browser testing.

Installation & usage

In browsers:

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

Using npm:

npm i --save lodash

{sudo} npm i -g lodash
npm ln lodash

In Node.js & Ringo:

var _ = require('lodash');
// or as Underscore
var _ = require('lodash/dist/lodash.underscore');

Notes:

• Don’t assign values to special variable _ when in the REPL
• If Lo-Dash is installed globally, run npm ln lodash in your project’s root directory before requiring it

In Rhino:

load('lodash.js');

In an AMD loader:

require({
  'packages': [
    { 'name': 'lodash', 'location': 'path/to/lodash', 'main': 'lodash' }
  ]
},
['lodash'], function(_) {
  console.log(_.VERSION);
});

Author

John-David Dalton

Contributors

Blaine Bublitz	Kit Cambridge	Mathias Bynens