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Questions tagged [lodash]

A modern JavaScript utility library delivering modularity, performance, and extras.

Lodash is a JavaScript utility library delivering consistency, customization, performance, and extra features. It includes an Underscore.js build that can be used as a replacement for , and indeed its functionality is a superset of Underscore.js's.

It comes in a "modern" build for newer browsers, a compatibility build for older browsers and , and per-method builds (individual features).

Lodash’s modular methods are great for:

  • Iterating arrays, objects, & strings
  • Manipulating and testing values
  • Creating composite functions
  • Creating your own mixin for Lodash

Useful links:

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Differences between Lodash and Underscore.js

Why would someone prefer either the Lodash or Underscore.js utility library over the other? Lodash seems to be a drop-in replacement for underscore, the latter having been around longer. I think both are brilliant, but I do not know enough about how…
Brian M. Hunt
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Lodash - difference between .extend() / .assign() and .merge()

In the Lodash library, can someone provide a better explanation of merge and extend / assign. Its a simple question but the answer evades me nonetheless.
JDillon522
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How to do a deep comparison between 2 objects with lodash?

I have 2 nested objects which are different and I need to know if they have a difference in one of their nested properties. var a = {}; var b = {}; a.prop1 = 2; a.prop2 = { prop3: 2 }; b.prop1 = 2; b.prop2 = { prop3: 3 }; The object could be much…
JLavoie
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Can't perform a React state update on an unmounted component

Problem I am writing an application in React and was unable to avoid a super common pitfall, which is calling setState(...) after componentWillUnmount(...). I looked very carefully at my code and tried to put some guarding clauses in place, but the…
Igor Soloydenko
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Lodash remove duplicates from array

This is my data: [ { url: 'www.example.com/hello', id: "22" }, { url: 'www.example.com/hello', id: "22" }, { url: 'www.example.com/hello-how-are-you', id: "23" }, …
ChrisRich
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What happened to Lodash _.pluck?

I once used Lodash _.pluck...I loved pluck... Realizing Lodash no longer supports pluck (as of Lodash 4.x), I'm struggling to remember what to use instead... I went to the docs, hit cmd-f, typed 'pluck', but my poor abandoned friend is not even…
sfletche
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Importing lodash into angular2 + typescript application

I am having a hard time trying to get the lodash modules imported. I've setup my project using npm+gulp, and keep hitting the same wall. I've tried the regular lodash, but also lodash-es. The lodash npm package: (has an index.js file in the package…
Davy
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How can I find and update values in an array of objects?

I have an array of objects. I want to find by some field, and then to change it: var item = {...} var items = [{id:2}, {id:2}, {id:2}]; var foundItem = items.find(x => x.id == item.id); foundItem = item; I want it to change the original object.…
user3712353
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Correct way to import lodash

I had a pull request feedback below, just wondering which way is the correct way to import lodash? You'd better do import has from 'lodash/has'.. For the earlier version of lodash (v3) which by itself is pretty heavy, we should only import a…
Bill
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How to remove undefined and null values from an object using lodash?

I have a Javascript object like: var my_object = { a:undefined, b:2, c:4, d:undefined }; How to remove all the undefined properties? False attributes should stay.
JLavoie
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How to filter keys of an object with lodash?

I have an object with some keys, and I want to only keep some of the keys with their value? I tried with filter: const data = { aaa: 111, abb: 222, bbb: 333 }; const result = _.filter(data, (value, key) =>…
Freewind
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Error: EACCES: permission denied

I run npm install lodash but it throws Error: EACCES: permission denied error. I know it is permission issue but as far as I know, sudo permission is not required for installing node module locally. If I run it with sudo, it gets installed inside…
xruptronics
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LoDash: Get an array of values from an array of object properties

I'm sure it's somewhere inside the LoDash docs, but I can't seem to find the right combination. var users = [{ id: 12, name: 'Adam' },{ id: 14, name: 'Bob' },{ id: 16, name: 'Charlie' },{ id: 18, …
YarGnawh
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transform object to array with lodash

How can I transform a big object to array with lodash? var obj = { 22: {name:"John", id:22, friends:[5,31,55], works:{books:[], films:[],} 12: {name:"Ivan", id:12, friends:[2,44,12], works:{books:[], films:[],} } // transform to var arr =…
siavolt
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How to Import a Single Lodash Function?

Using webpack, I'm trying to import isEqual since lodash seems to be importing everything. I've tried doing the following with no success: import { isEqual } from 'lodash' import isEqual from 'lodash/lang' import isEqual from…
cvdv
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