lodash.uniqwith

What is lodash.uniqwith?

The lodash.uniqwith package is a utility library that provides a method to create a duplicate-free version of an array, using a custom comparator function to determine the uniqueness of elements. This is particularly useful when dealing with complex data structures where simple equality checks are insufficient.

What are lodash.uniqwith's main functionalities?

Remove duplicates with custom comparator

This feature allows you to remove duplicate objects from an array using a custom comparator function. In this example, the _.isEqual function is used to compare the objects for equality.

const _ = require('lodash.uniqwith');

const objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }];

const result = _.uniqWith(objects, _.isEqual);
console.log(result); // [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]

Other packages similar to lodash.uniqwith

array-uniq

The array-uniq package provides a simple way to remove duplicate values from an array. However, it does not support custom comparator functions, making it less flexible than lodash.uniqwith for complex data structures.

ramda

Ramda is a functional programming library for JavaScript that includes a uniqWith function similar to lodash.uniqwith. Ramda's uniqWith also allows for custom comparator functions, but Ramda emphasizes immutability and functional programming paradigms.

underscore

Underscore is a utility library similar to Lodash. It provides a uniq function, but it does not support custom comparator functions out of the box. For custom comparisons, additional code would be required.

README

lodash.uniqwith v4.5.0

The lodash method _.uniqWith exported as a Node.js module.

Installation

Using npm:

$ {sudo -H} npm i -g npm
$ npm i --save lodash.uniqwith

In Node.js:

var uniqWith = require('lodash.uniqwith');

See the documentation or package source for more details.