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How to use the differenceBy function from lodash

Find comprehensive JavaScript lodash.differenceBy code examples handpicked from public code repositorys.

lodash.differenceBy returns an array of unique values from the first array, based on a given iteratee function, that are not present in the second array.

lodash-contrib.commonjs.js

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module.exports.defaultsDeep        = _.defaultsDeep;
module.exports.defer               = _.defer;
module.exports.delay               = _.delay;
module.exports.dictionary          = _.dictionary;
module.exports.difference          = _.difference;
module.exports.differenceBy        = _.differenceBy;
module.exports.differenceWith      = _.differenceWith;
module.exports.disjoin             = _.disjoin;
module.exports.div                 = _.div;
module.exports.divide              = _.divide;

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+ 92 other calls in file

project.service.js

GitHub: vmware/data-annotator-for-machine-learning

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}
if (req.body.isShowFilename == true || req.body.isShowFilename == false) {
    update.$set['isShowFilename'] = req.body.isShowFilename;
}
if (config.buildSlackApp && req.body.assignSlackChannels.length > 0) {
    let newChannels = _.differenceBy(req.body.assignSlackChannels, projectInfo.assignSlackChannels, 'slackId')
    if (newChannels.length > 0) {
        let params = {
            channels: newChannels,
            pname: req.body.pname,

How does lodash.differenceBy work?

lodash.differenceBy is a utility function in the Lodash library that returns the difference between two arrays, using a function to determine the unique value to compare against, rather than using strict equality. It takes in two array arguments, and a function argument that returns the value to be compared from each element in both arrays. The function is called with each element from both arrays and the returned values are compared using === to find unique values in the first array that do not exist in the second array. The function argument can also be a string property name, in which case the value of that property from each element is used for comparison.

Crawler.js

GitHub: muhamed-didovic/eddown

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})
console.log('Total number of courses found:', links.length);//, links
//remove courses that are downloaded already
if (await fs.exists(path.resolve(__dirname, '../json/search-courses.json'))) {
    const downloadedCourses = await require(path.resolve(__dirname, '../json/search-courses.json'))
    links = differenceBy(links, downloadedCourses, 'url')
    //console.log('Remaining courses to be downloaded:', links.length);
}

return all ? links : [links.find(({ url }) => link.includes(url))]//series.find(link => url.includes(link.url))

aws-cfn.js

GitHub: aws-amplify/amplify-cli

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showNewEvents(events) {
  const allShownEvents = this.stackEvents;
  let newEvents = [];

  if (allShownEvents.length) {
    newEvents = _.differenceBy(events, allShownEvents, 'EventId');
  } else {
    newEvents = events;
  }
  if (this.eventMap && this.progressBar.isTTY()) {

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+ 4 other calls in file

Ai Example

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const _ = require("lodash");

const array1 = [
  { id: 1, name: "John" },
  { id: 2, name: "Jane" },
];
const array2 = [
  { id: 2, name: "Jane" },
  { id: 3, name: "Bob" },
];

const result = _.differenceBy(array1, array2, "id");

console.log(result);
// Output: [{ id: 1, name: 'John' }]

In this example, lodash.differenceBy is used to find the difference between array1 and array2 based on the id property of their objects. The resulting array contains only the objects from array1 that are not present in array2.

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(concat); // => [1, 2, 3, [4]]


const difference = _.difference([2, 1], [2, 3]);
console.log(difference); // => [1]


const differenceBy = _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
console.log(differenceBy); // => [1.2]


const differenceWith = _.differenceWith([2.1, 1.2], [2.3, 3.4], (a, b) => Math.floor(a) === Math.floor(b));
console.log(differenceWith); // => [1.2]

+ 15 other calls in file

controller.js

GitHub: SparrowAcst/sync-data

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const { extend, differenceBy, isUndefined, find, flattenDeep, first, uniqBy, keys, maxBy } = require("lodash")


const getNewExaminations = async () => {
	let mongoExams = await mongodbService.execute.aggregate("sparrow.examination")
  	let fbExams = await firebaseService.execute.getCollectionItems("examinations")
  	let res = differenceBy( fbExams,mongoExams, d => d.id)
  	return res
}

+ 2 other calls in file

index.js

GitHub: FoodRates/vendors-menu

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const nullified = (a, b) => !_.isNil(a.value) && _.isNil(b.value);
const emptied = (a, b) => a.value !== "" && b.value === "";

let addedNodes;
if (orphans) {
  addedNodes = _.differenceBy(modifiedLeafNodes, originalLeafNodes, "path");
} else {
  addedNodes = _.differenceBy(modifiedNodes, originalNodes, "path");
  addedNodes = ancestorNodes(addedNodes, true);
}

+ 17 other calls in file

lodash.js

GitHub: ThisisNirmalJaiswal/practiceJS

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// let arr1 = [1,2,3,4];
// let arr2 = [2]
// let result = _.difference(arr1, arr2)
// console.log(result)


// _.differenceBy(array, [values], [iteratee=_.identity])
// This method is like _.difference except that it accepts iteratee which is invoked for each element of array and values to generate the criterion by which they're compared. 
// The order and references of result values are determined by the first array. 
// The iteratee is invoked with one argument:
// (value).

+ 17 other calls in file

authors.js

GitHub: Haydndiniz/Personal-Blog

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    .transacting(trx)
    .whereIn('post_id', primaryPostsWithOwnerCoauthorIds)
    .where('author_id', ownerId)
    .update('sort_order', 0);

const primaryPostsWithoutOwnerCoauthor = _.differenceBy(authorsPrimaryPosts, primaryPostsWithOwnerCoauthor, 'post_id');
const postsWithoutOwnerCoauthorIds = primaryPostsWithoutOwnerCoauthor.map(post => post.post_id);

// swap out current author with the owner
await knex('posts_authors')

+ 3 other calls in file

fruits-sorts.js

GitHub: A-ST-RA/lodash-task-solves

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  return fruit1.type === fruit2.type;
});
console.log(similarFruits);


// Каких элементов первого нет во втором массиве?
const uniqueFruits = _.differenceBy(fruits1, fruits2, 'type');
console.log(uniqueFruits);

arraydemo.js

GitHub: Hupeng7/es6demo

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//_.differeneceBy(array,[values],[iteratee=.identity])
let differenceBy1 = _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
console.log('differenceBy--->', differenceBy1);
//differenceBy---> [ 1.2 ]


let differenceBy2 = _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
console.log('differenceBy2--->', differenceBy2);
//differenceBy2---> [ { x: 2 } ]


//_.differenceWith(array,[values],[comparator])

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