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How to use the groupBy function from lodash

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

lodash.groupBy is a function that groups an array of objects into a new object based on a specified property.

astrobench.js

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 *
 * _.groupBy([4.2, 6.1, 6.4], function(num) { return this.floor(num); }, Math);
 * // => { '4': [4.2], '6': [6.1, 6.4] }
 *
 * // using "_.pluck" callback shorthand
 * _.groupBy(['one', 'two', 'three'], 'length');
 * // => { '3': ['one', 'two'], '5': ['three'] }
 */
var groupBy = createAggregator(function(result, value, key) {
  (hasOwnProperty.call(result, key) ? result[key] : result[key] = []).push(value);

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+ 5 other calls in file

lodash-contrib.commonjs.js

GitHub: node4good/lodash-contrib

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module.exports.functionalize       = _.functionalize;
module.exports.functions           = _.functions;
module.exports.functionsIn         = _.functionsIn;
module.exports.get                 = _.get;
module.exports.getPath             = _.getPath;
module.exports.groupBy             = _.groupBy;
module.exports.gt                  = _.gt;
module.exports.gtContrib           = _.gtContrib;
module.exports.gte                 = _.gte;
module.exports.gteContrib          = _.gteContrib;

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+ 92 other calls in file

How does lodash.groupBy work?

lodash.groupBy is a function in the lodash library that groups an array of objects based on a provided key and returns an object whose keys correspond to the values of the provided key and values correspond to an array of elements in the input array that have the same key value.

versionedRouter.js

GitHub: rudderlabs/rudder-transformer

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    // to have the backward-compatibility and being extra careful. We need to remove this (message.anonymousId) in next release.
    const rudderId = event.metadata.rudderId || event.message.anonymousId;
    return `${event.destination.ID}_${event.metadata.sourceId}_${rudderId}`;
  });
} else {
  groupedEvents = _.groupBy(
    events,
    (event) => `${event.metadata.destinationId}_${event.metadata.sourceId}`,
  );
}

+ 3 other calls in file

PLDB.js

GitHub: breck7/pldb

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      id: file.id,
      title: file.title,
      example: file.extendedFeaturesNode.getNode(id).childrenToString()
    }
  })
const grouped = lodash.groupBy(examples, "example")
const examplesText = Object.values(grouped)
  .map(group => {
    const links = group
      .map(hit => `<a href="../truebase/${hit.id}.html">${hit.title}</a>`)

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+ 3 other calls in file

Ai Example

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const _ = require("lodash");

const users = [
  { name: "Alice", age: 25 },
  { name: "Bob", age: 30 },
  { name: "Charlie", age: 25 },
  { name: "David", age: 40 },
];

const groupedUsers = _.groupBy(users, "age");
console.log(groupedUsers);

This code will group the users array by age using lodash.groupBy, resulting in an object with age values as keys and arrays of users as values. The output will look like this: css Copy code

transform.js

GitHub: rudderlabs/rudder-transformer

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// {
//    event_set_id1: [...events]
//    event_set_id2: [...events]
// }
const groupedEventChunks = _.groupBy(eventChunksArray, (event) => event.message.event_set_id);
Object.keys(groupedEventChunks).forEach((eventSetId) => {
  // eventChunks = [[e1,e2,e3,..batchSize],[e1,e2,e3,..batchSize]..]
  const eventChunks = _.chunk(groupedEventChunks[eventSetId], MAX_BATCH_SIZE);
  eventChunks.forEach((chunk) => {

+ 4 other calls in file

reference.js

GitHub: akeneo/pim-api-docs

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    data.categories[escapeCategory].resources[escapeTag] = { resourceName: operation.tags[0], operations: {}};
}
if(category.includes('Catalogs for Apps')) {
    data.categories[escapeCategory].isAppCategory = true;
}
var groupedParameters = _.groupBy(operation.parameters, function(parameter) {
    return parameter.in;
});
_.map(groupedParameters.body, function(parameter) {
    var readOnlyProperties = [];

+ 7 other calls in file

Gruntfile.js

GitHub: BUILDS-/builds-workshops

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var _ = require('lodash');




// Split array to smaller arrays containing n elements at max
function groupToElements(array, n) {
  var lists = _.groupBy(array, function(element, index){
    return Math.floor(index / n);
  });


  return _.toArray(lists);

+ 2 other calls in file

ChallengeService.js

GitHub: topcoder-platform/challenge-api

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) {
  throw new errors.BadRequestError(
    `Cannot update prizeSets for challenges with status: ${finalStatus}!`
  );
}
const prizeSetsGroup = _.groupBy(data.prizeSets, "type");
if (prizeSetsGroup[constants.prizeSetTypes.ChallengePrizes]) {
  const totalPrizes = helper.sumOfPrizes(
    prizeSetsGroup[constants.prizeSetTypes.ChallengePrizes][0].prizes
  );

srs-service.js

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

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        srs['probab'] = Object.values(labelCase).sort((x,y)=> y-x);
    }
}
//sort the max-uncertain Ascending
tickets = await _.sortBy(tickets, 'probab');
let ticketsGrop = await _.groupBy(tickets, 'probab[0]');
const annotationNum = Object.keys(ticketsGrop)[0];

let temp = [];
if(annotationNum >= mp.project.maxAnnotation){

+ 3 other calls in file

playlists.js

GitHub: u-wave/core

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  throw new Error('Cannot add a playlist item without a proper media source type and ID.');
}

// Group by source so we can retrieve all unknown medias from the source in
// one call.
const itemsBySourceType = groupBy(items, 'sourceType');
/**
 * @type {{ media: Media, artist: string, title: string, start: number, end: number }[]}
 */
const playlistItems = [];

+ 3 other calls in file

gulpfile.js

GitHub: 32pixelsCo/zest-icons

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function previewSvgPipeline(package, done) {
  var ZestIcons = require(packagePath(package.name, 'javascript', package.bundle))
  var svg = []
  var maxCol = 20
  var width = 24 * maxCol
  var iconsByCategory = _.groupBy(ZestIcons.all, 'category')
  var categoryUids = _.keys(iconsByCategory).sort().reverse()
  var categories = []
  var accumulatedWidth = ((maxCol * 2) + 1) * 24
  var accumulatedHeight = (categoryUids.length + 1) * 24

+ 15 other calls in file

arguments.js

GitHub: plouc/flambo

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 */
exports.mapArgs = (spec, name, method, path, args) => {
    const allBridgeParams = _.flatten(args)


    // Prevent dupes
    const byName = _.groupBy(allBridgeParams)
    Object.keys(byName).forEach(arg => {
        if (byName[arg].length > 1) {
            throw new Error(`found duplicated argument '${arg}' for '${method} ${path}' (method: '${name}()')`)
        }

addok.cjs

GitHub: BaseAdresseNationale/ban-plateforme

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voies.filter(a => a.type === 'lieu-dit' && a.lon && a.lat).forEach(lieuDit => {
  adressesStream.write(buildLocality(lieuDit))
})

const numerosGeolocalises = groupBy(numeros.filter(n => n.lon && n.lat), 'idVoie')

const voiesAvecNumeros = voies
  .filter(v => v.lon && v.lat && v.idVoie in numerosGeolocalises && v.type === 'voie')
  .map(v => ({...v, numeros: numerosGeolocalises[v.idVoie]}))

subsetFonts.js

GitHub: Munter/subfont

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      };
    });
  }).filter((textByProps) => textByProps && textByProps.fontUrl)
);

const textsByFontUrl = _.groupBy(snappedTexts, 'fontUrl');

return _.map(textsByFontUrl, (textsPropsArray, fontUrl) => {
  const texts = textsPropsArray.map((obj) => obj.text);
  const preload = textsPropsArray.some((obj) => obj.preload);

lodash.js

GitHub: mdmarufsarker/lodash

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const forEach = _.forEach([1, 2], value => console.log(value));


const forEachRight = _.forEachRight([1, 2], value => console.log(value));


const groupBy = _.groupBy([6.1, 4.2, 6.3], Math.floor);
console.log(groupBy); // => { '4': [4.2], '6': [6.1, 6.3] }


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

+ 15 other calls in file

eval-markdown.js

GitHub: reggi/node-reggi

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    return node.type.match(/\_close$/)
  })
}

var groupChildren = main.groupChildren = function (nodes) {
  nodes = _.groupBy(nodes, function (node) {
    return previousIndexClose(node, nodes)
  })
  return _.values(nodes)
}

format.js

GitHub: iptv-org/iptv

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  ['channel', s => (s.channel ? '' : s.title), 'url'],
  ['asc', 'asc', 'asc']
)

logger.info('saving...')
const files = _.groupBy(streams, 'filepath')
for (const filepath in files) {
  const playlist = createPlaylist(files[filepath], { public: false })
  await file.create(filepath, playlist.toString())
}

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Table.js

GitHub: gbv/SignaturenDruck

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/*
----- Private Area -----
 */
function groupByPPN (obj) {
  return _.groupBy(obj, 'PPN')
}
/*
----- End Private Area -----
 */

wObjectHelper.js

GitHub: Waiviogit/waivio-api

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const winningFields = {};
const filteredFields = getFilteredFields(fields, locale, filter, ownership);

if (!filteredFields.length) return {};

const groupedFields = _.groupBy(filteredFields, 'name');
for (const id of Object.keys(groupedFields)) {
  const approvedFields = _.filter(groupedFields[id],
    (field) => _.get(field, 'adminVote.status') === VOTE_STATUSES.APPROVED);

+ 5 other calls in file

list_helper.js

GitHub: xuyanshi/Full-Stack-Open

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const mostBlogs = (blogs) => {
  if (blogs.length === 0) {
    return undefined
  }


  const blogsByAuthor = groupBy(blogs, (blog) => blog.author)


  const authorBlogs = Object.entries(blogsByAuthor).reduce((array, [author, blogList]) => {
    return array.concat({
      author,

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