lodash v4.0.0

2015 was big year!Lodash became themost depended on npm package, passed1 billion downloads, & its v3 release saw massive adoption!

The year was also one of collaboration, as discussions began onmerging Lodash & Underscore. Much of Lodash v4 is proofing out the ideas from those discussions. Lodash v4would not be possible without the collaboration & contributions of the Underscore core team. In the spirit of merging our teams have blended withseveral members contributing to both libraries.

For 2016 &lodash v4.0.0 we wanted to cut loose, push forward, & take things up a notch!

Modern only

With v4 we’re breaking free fromold projects, old environments, & droppingold IE < 9 support!

4 kB Core

Lodash’s kitchen-sink size will continue to grow as new methods & functionality are added. However, we now offer a 4 kB (gzipped)core build that’s compatible withBackbone v1.2.4 for folks who want Lodash without lugging around the kitchen sink.

More ES6

We’ve continued to embrace ES6 with methods like_.isSymbol, added support for cloning & comparing array buffers, maps, sets, & symbols, converting iterators to arrays, & iterable_(…).

In addition, we’ve published anes-build & pulledbabel-plugin-lodash into core to make tree-shaking a breeze.

More Modular

Pop quiz! 📣

What category path does thebindAll method belong to? Is it

A)require('lodash/function/bindAll')
B)require('lodash/utility/bindAll')
C)require('lodash/util/bindAll')

Don’t know? Well, with v4 it doesn’t matter because now module paths are as simple as

varbindAll=require('lodash/bindAll');

We’ve also reduced module complexity making it easier to create smaller bundles. This has helped Lodash adoption with libraries likeAsync &Redux!

1st Class FP

With v3 we introducedlodash-fp. We learned a lot & with v4 we decided topull it into core.

Now you can get immutable, auto-curried, iteratee-first, data-last methods as simply as

var_=require('lodash/fp');varobject={'a':1};varsource={'b':2};varnewObject=_.assign(source)(object);console.log(newObject);// => { 'a': 1, 'b': 2 }console.log(object);// => { 'a': 1 }varconvert=require('lodash/fp/convert');varassign=convert('assign',require('lodash.assign'));// works too!

Chakra Optimized

Well actually, while we’reexcited about Chakra, Lodash is optimized for great performance acrossall engines. Unlike many libraries, we don’t favor a single engine so we can deliver solid performance & support regardless of engine.

With v4 we’ve continued our commitment to performance; expanding support for lazy evaluation & improving the performance of core functionality like circular reference detection.

Emojis

Taking things up a notch Lodash v4 has added support for emojis! Includes things like
astral symbols,unicode modifiers,variation selector characters,zero-width joiners, &regional indicator symbols.

Breaking changes

We’ve introduced more breaking changes in this release than any other so be sure to check out thechangelog for a full rundown of changes & givelodash-migrate a spin to help migrate older Lodash code to the latest release.

If you dig Lodash don’t forget tostar the repo ornpm star lodash!