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How to use the map function from lodash

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

lodash.map is a method that creates a new array by applying a function to each element of an input array.

brewRenderer.jsx

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			return this.renderDummyPage(index);
		}
	});
}
if(this.props.errors && this.props.errors.length) return this.lastRender;
this.lastRender = _.map(this.state.pages, (page, index)=>{
	if(typeof window !== 'undefined') {
		return this.renderPage(page, index);
	} else {
		return this.renderDummyPage(index);

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app.js

GitHub: naturalcrit/homebrewery

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		googleBrews = googleBrews.map((brew)=>({ ...brew, authors: [req.account.username] }));
		brews = _.concat(brews, googleBrews);
	}
}

req.brews = _.map(brews, (brew)=>{
	return sanitizeBrew(brew, ownAccount ? 'edit' : 'share');
});

return next();

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How does lodash.map work?

lodash.map is a higher-order function provided by the Lodash library that allows the user to iterate over a collection and perform a transformation on each element of the collection, returning a new collection with the transformed elements. It takes two arguments, the first is the collection to be iterated over, and the second is a function that is called for each element in the collection. This function can be provided with up to three arguments: the current element, the index of the current element, and the entire collection being iterated over. The function then returns the transformed element which is added to the new collection that is returned by lodash.map.

listPage.jsx

GitHub: naturalcrit/homebrewery

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renderBrewCollection : function(brewCollection){
	if(brewCollection == []) return <div className='brewCollection'>
		<h1>No Brews</h1>
	</div>;
	return _.map(brewCollection, (brewGroup, idx)=>{
		return <div key={idx} className={`brewCollection ${brewGroup.class ?? ''}`}>
			<h1 className={brewGroup.visible ? 'active' : 'inactive'} onClick={()=>{this.toggleBrewCollectionState(brewGroup.class);}}>{brewGroup.title || 'No Title'}</h1>
			{brewGroup.visible ? this.renderBrews(this.getSortedBrews(brewGroup.brews)) : <></>}
		</div>;

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+ 19 other calls in file

utils.js

GitHub: compdemocracy/polis

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  return Object.fromEntries(params);
}


function toQueryParamString(o) {
  var pairs = _.pairs(o);
  pairs = _.map(pairs, function(pair) {
    return pair[0] + '=' + encodeURIComponent(pair[1]);
  });
  return pairs.join("&");
}

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+ 4 other calls in file

Ai Example

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const array = [1, 2, 3];
const result = _.map(array, (value) => value * 2);

console.log(result); // Output: [2, 4, 6]

In this example, lodash.map is used to iterate over the array and multiply each value by 2, returning a new array with the updated values. The resulting array [2, 4, 6] is then logged to the console.

HostManager.js

GitHub: firewalla/firewalla

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        }
      }
    }
  }

  return _.map(intfMap, (macs, intf) => {
    return {intf, macs: _.uniq(macs)};
  });
}

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+ 25 other calls in file

addon-registry.js

GitHub: plone/volto

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        name: '@plone/volto',
      },
);

reg.forEach(({ customPath, name, sourcePath }) => {
  map(
    glob(`${customPath}/**/*.*(svg|png|jpg|jpeg|gif|ico|less|js|jsx)`),
    (filename) => {
      const targetPath = filename.replace(customPath, sourcePath);
      if (fs.existsSync(targetPath)) {

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i18n.cjs

GitHub: plone/volto

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  });

  return result;
};

map(glob('locales/**/*.po'), (filename) => {
  let { items } = Pofile.parse(fs.readFileSync(filename, 'utf8'));
  const projectLocalesItems = Pofile.parse(fs.readFileSync(filename, 'utf8'))
    .items;
  const lang = filename.match(/locales\/(.*)\/LC_MESSAGES\//)[1];

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+ 9 other calls in file

index.js

GitHub: gardener/dashboard

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}


async function listTerminalSessions ({ user, namespace }) {
  const terminals = await listTerminals({ user, namespace })


  return _.map(terminals, terminal => {
    return {
      metadata: toTerminalMetadata(terminal)
    }
  })

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+ 3 other calls in file

album.js

GitHub: thumbsup/thumbsup

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  this.pickPreviews(options)
}


Album.prototype.calculateStats = function () {
  // nested albums
  const nestedPhotos = _.map(this.albums, 'stats.photos')
  const nestedVideos = _.map(this.albums, 'stats.videos')
  const nestedFromDates = _.map(this.albums, 'stats.fromDate')
  const nestedToDates = _.map(this.albums, 'stats.toDate')
  // current level

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+ 29 other calls in file

reference.js

GitHub: akeneo/pim-api-docs

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    data.categories[escapeCategory].isAppCategory = true;
}
var groupedParameters = _.groupBy(operation.parameters, function(parameter) {
    return parameter.in;
});
_.map(groupedParameters.body, function(parameter) {
    var readOnlyProperties = [];
    _.map(parameter.schema.properties, function(property, propertyName) {
        property.default = (property.default === 0) ? '0' :
            (property.default === null) ? 'null' :

+ 39 other calls in file

lab.js

GitHub: EpistasisLab/Aliro

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// Machine page
app.get("/machines/:id", (req, res, next) => {
    db.machines.findByIdAsync(req.params.id)
        .then((mac) => {
            var projKeys = _.keys(mac.projects); // Extract project IDs
            projKeys = _.map(projKeys, db.toObjectID); // Map to MongoDB IDs
            db.projects.find({
                    _id: {
                        $in: projKeys
                    }

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+ 4 other calls in file

manager.js

GitHub: pocketnetteam/pocketnet.gui

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self.api = {
    ///
    connected : function(nodes){
        var connected = []

        var promises = _.map(nodes, function(node){

            return node.info().then(r => {

                var bchain = 'main'

+ 170 other calls in file

index.js

GitHub: rudderlabs/rudder-transformer

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// it'll look for properties, traits and context.traits in the order
const getValueFromPropertiesOrTraits = ({ message, key }) => {
  const keySet = ['properties', 'traits', 'context.traits'];


  const val = _.find(
    _.map(keySet, (k) => get(message, `${k}.${key}`)),
    (v) => !_.isNil(v),
  );
  return !_.isNil(val) ? val : null;
};

+ 15 other calls in file

framework-repository.js

GitHub: 1024pix/pix

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  return _toDomain(framework);
}


async function findByRecordIds(frameworkIds) {
  const frameworkDatas = await frameworkDatasource.findByRecordIds(frameworkIds);
  const frameworks = _.map(frameworkDatas, (frameworkData) => _toDomain(frameworkData));
  return _.orderBy(frameworks, (framework) => framework.name.toLowerCase());
}


module.exports = {

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manager.js

GitHub: pocketnetteam/pocketnet.gui

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var nds = _.filter(self.initednodes(), (nd) => {
    return nd.allowRpc
})

var np = _.map(nds, function(node){
    return {
        node : node,
        probability : (Number(node.statistic.probability()) || 0) + Math.random() / 10000
    }

+ 71 other calls in file

proxy.js

GitHub: pocketnetteam/pocketnet.gui

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detach: function (modules) {

	if (!modules) modules = ['nodeControl']

	var promises = _.map(modules, (i) => {
		return self[i].detach().catch(e => {
			return Promise.resolve()
		})
	})

+ 55 other calls in file

index.js

GitHub: ncsoft/Unreal.js-demo

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    defer(_ => busy = false)
}
ready()

let scene = localStorage.get('demo')
let sceneIds = _.map(scenes, (v, k) => _.extend(_.clone(k), { description: v.description }))
if (scene === null || scenes[scene] == undefined) {
    scene = sceneIds[0]
}

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helper.js

GitHub: topcoder-platform/challenge-api

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 * @param {String} challengeId the challenge UUID
 * @param {String} userId the user ID
 */
async function userHasFullAccess (challengeId, userId) {
  const resourceRoles = await getResourceRoles()
  const rolesWithFullAccess = _.map(_.filter(resourceRoles, r => r.fullWriteAccess), 'id')
  const challengeResources = await getChallengeResources(challengeId)
  return _.filter(challengeResources, r => _.toString(r.memberId) === _.toString(userId) && _.includes(rolesWithFullAccess, r.roleId)).length > 0
}

+ 7 other calls in file

app-routes.js

GitHub: topcoder-platform/challenge-api

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  }
} else {
  req.authUser.userId = String(req.authUser.userId)
  // User roles authorization
  if (req.authUser.roles) {
    if (def.access && !helper.checkIfExists(_.map(def.access, a => a.toLowerCase()), _.map(req.authUser.roles, r => r.toLowerCase()))) {
      next(new errors.ForbiddenError('You are not allowed to perform this action!'))
    } else {
      // user token is used in create/update challenge to ensure user can create/update challenge under specific project
      req.userToken = req.headers.authorization.split(' ')[1]

+ 7 other calls in file

app.js

GitHub: topcoder-platform/challenge-api

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const errorResponse = {}
const status = err.isJoi ? HttpStatus.BAD_REQUEST : (err.httpStatus || _.get(err, 'response.status') || HttpStatus.INTERNAL_SERVER_ERROR)

if (_.isArray(err.details)) {
  if (err.isJoi) {
    _.map(err.details, (e) => {
      if (e.message) {
        if (_.isUndefined(errorResponse.message)) {
          errorResponse.message = e.message
        } else {

+ 3 other calls in file

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