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How to use the pickBy function from lodash

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

lodash.pickBy is a function that creates a new object with all the properties that satisfy a specific condition.

lodash-contrib.commonjs.js

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module.exports.partial             = _.partial;
module.exports.partialRight        = _.partialRight;
module.exports.partition           = _.partition;
module.exports.partitionBy         = _.partitionBy;
module.exports.pick                = _.pick;
module.exports.pickBy              = _.pickBy;
module.exports.pickWhen            = _.pickWhen;
module.exports.pipeline            = _.pipeline;
module.exports.property            = _.property;
module.exports.propertyOf          = _.propertyOf;

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+ 92 other calls in file

index.js

GitHub: rudderlabs/rudder-transformer

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const isDefined = (x) => !_.isUndefined(x);
const isNotEmpty = (x) => !_.isEmpty(x);
const isNotNull = (x) => x != null;
const isDefinedAndNotNull = (x) => isDefined(x) && isNotNull(x);
const isDefinedAndNotNullAndNotEmpty = (x) => isDefined(x) && isNotNull(x) && isNotEmpty(x);
const removeUndefinedValues = (obj) => _.pickBy(obj, isDefined);
const removeNullValues = (obj) => _.pickBy(obj, isNotNull);
const removeUndefinedAndNullValues = (obj) => _.pickBy(obj, isDefinedAndNotNull);
const removeUndefinedAndNullAndEmptyValues = (obj) => _.pickBy(obj, isDefinedAndNotNullAndNotEmpty);
const isBlank = (value) => _.isEmpty(_.toString(value));

+ 4 other calls in file

How does lodash.pickBy work?

lodash.pickBy is a function that takes an object and a predicate function as arguments. It creates a new object with all the properties of the original object that satisfy the predicate function. The predicate function takes two arguments: the value of the property and the key of the property. If the predicate function returns a truthy value, the property is included in the new object. If the predicate function returns a falsy value, the property is not included in the new object.

Here's an example of how lodash.pickBy works:

javascript
const _ = require('lodash');

const obj = {
  name: 'John',
  age: 30,
  isMale: true,
  address: '123 Main St',
  phone: '555-555-5555'
};

const newObj = _.pickBy(obj, (value, key) => {
  return key.length === 3 || value === true;
});

console.log(newObj);
// Output: { name: 'John', isMale: true }

In this example, we use lodash.pickBy to create a new object that includes only the properties with three-character keys or properties with boolean values. We pass the obj object as the first argument to lodash.pickBy, and a predicate function as the second argument.

The predicate function takes two arguments: value and key. In this example, we use an arrow function that returns true if the length of the key is 3, or if the value is true. This means that the new object will only include properties with three-character keys or properties with boolean values.

The resulting newObj object only includes the name and isMale properties of the original obj, since those are the only properties that satisfy the predicate function.

fieldsAnt.cjs.js

GitHub: mighty-justice/fields-ant

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    processErrors: function processErrors(errors) {
      return errors;
    },
    resetOnSuccess: true,
    successText: 'Success'
  }, lodash.pickBy(args, function (value) {
    return value !== undefined;
  }));
}

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(omitBy); // => { 'b': '2' }


const pick = _.pick({ 'a': 1, 'b': '2', 'c': 3 }, ['a', 'c']);
console.log(pick); // => { 'a': 1, 'c': 3 }


const pickBy = _.pickBy({ 'a': 1, 'b': '2', 'c': 3 }, _.isNumber);
console.log(pickBy); // => { 'a': 1, 'c': 3 }


const result = _.result({ 'a': { 'b': () => 2 } }, 'a.b');
console.log(result); // => 2

+ 15 other calls in file

Ai Example

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const _ = require("lodash");

const person = {
  name: "John Doe",
  age: 30,
  email: "",
  address: null,
  phone: "1234567890",
};

const filteredPerson = _.pickBy(person, Boolean);

console.log(filteredPerson);
// Output: { name: 'John Doe', age: 30, phone: '1234567890' }

In this example, _.pickBy(person, Boolean) creates a new object with only the properties having truthy values, which are name, age, and phone.

mount-models.js

GitHub: Akemona/strapi

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  schema.pre(key, populateFn);
});

// Add virtual key to provide populate and reverse populate
_.forEach(
  _.pickBy(definition.loadedModel, ({ type }) => type === 'virtual'),
  (value, key) => {
    schema.virtual(key, {
      ref: value.ref,
      localField: '_id',

attendance.js

GitHub: kosinix/hris

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attendances = attendances.map((attendance, i) => {
    if (!attendance.source.photo) {
        attendance.source.photo = lodash.get(attendance, 'extra.photo', '')
    }
    attendance.logTime = moment(attendance.dateTime).format('hh:mm A')
    attendance = lodash.pickBy(attendance, function (a, key) {
        return ['_id', 'logTime', 'source', 'employee'].includes(key)
    });
    return attendance
})

+ 4 other calls in file

result-processing.js

GitHub: arangodb/arangodb

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try {
  let resultFile = fs.join(options.testOutputDirectory, 'UNITTEST_RESULT.json');
  let lastRun = JSON.parse(fs.readFileSync(resultFile));
  let filter;
  filter = (obj) => {
    return _.pickBy(_.mapValues(obj, v => {
        if (typeof v === 'object' && v.status === false) {
          return filter(v);
        }
        return undefined;

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+ 2 other calls in file

update.js

GitHub: UniversityOfHelsinkiCS/palaute

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  sendContinuousFeedbackDigestEmail,
  settingsReadByTeacher,
} = body
const parseDate = d => parseFromTimeZone(new Date(d), { timeZone: 'Europe/Helsinki' })

const updates = _.pickBy(
  {
    name,
    hidden,
    opensAt: opensAt ? startOfDay(parseDate(opensAt)) : undefined,

HostManager.js

GitHub: firewalla/firewalla

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  if (f.isMain()) {
    await this.syncHost(hostbymac, ipv6AddrOld)
  }
})

this.hostsdb = _.pickBy(this.hostsdb, {_mark: true})
this.hosts.all = _.filter(this.hosts.all, {_mark: true})

this.hosts.all.sort(function (a, b) {
  return Number(b.o.lastActiveTimestamp || 0) - Number(a.o.lastActiveTimestamp || 0);

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+ 12 other calls in file

pollers.js

GitHub: harvestfi/harvest-api

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  fetchedMATICVaults = [],
  fetchedARBITRUMVaults = [],
  fetchedVaults,
  hasErrors = false

const tokensWithVault = pickBy(tokens, token => token.vaultAddress)

const ethVaultsBatches = chunk(
  Object.keys(tokensWithVault).filter(tokenId => tokens[tokenId].chain === CHAIN_TYPES.ETH),
  GET_VAULT_DATA_BATCH_SIZE,

+ 4 other calls in file

base.service.js

GitHub: yethuaungptu/happy-lucky-api

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        }
    }
];


exports.filterById = (pipelineStages, obj) => {
    const filters = _.pickBy(obj, (v) => v !== undefined);


    for (key in filters) {
        pipelineStages.push({ $match: { [key]: filters[key] } });
    }

+ 7 other calls in file

testScripts.js

GitHub: nurzatkhan/http

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const fullName = [
  rpnData?.lastName?._text,
  rpnData?.firstName?._text,
  rpnData?.secondName?._text,
].join(" ");
return _.pickBy(
  {
    iin: rpnData?.iin?._text,
    bdate: new Date(rpnData?.birthDate?._text),
    firstname: rpnData?.firstName?._text,

+ 33 other calls in file

utils.js

GitHub: julianoprogrammierer/cypress-DIO

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  return (_.has(filter, key) || _.has(filter, upperKey)) &&
    filter[key] !== value
}

obj = _.pickBy(obj, whereFilterHasSameKeyButDifferentValue)

if (_.isEmpty(obj)) {
  return undefined
}

index.js

GitHub: venuatu/dmv-watch

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var incragg = _.mapValues(agg, (v) => _.sortBy(v, 'time'));

Promise.all(_.map(incragg, function (data, key) {
  var prev = {};
  var output = _.chain(data).map(function (item) {
    var times = _.pickBy(item.times, function (time, key) {
      if (!_.isEqual(time, prev[key])) {
        prev[key] = _.clone(time);
        return true;
      }

+ 26 other calls in file

users-permissions.js

GitHub: carboni09/strapi4.0.7-custom

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_.forEach(strapi.api, (api, apiName) => {
  const controllers = _.reduce(
    api.controllers,
    (acc, controller, controllerName) => {
      const contentApiActions = _.pickBy(controller, isContentApi);

      if (_.isEmpty(contentApiActions)) {
        return acc;
      }

scrape.service.js

GitHub: keylimejoe24/stocks-api-docker-compose

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}

let response = await ProxiedRequest.get(url,body,metricsTracker)
let res = await response.text()
let parsedTables = await parseYahooHtml(res);
let shortPercentOfSharesOutStanding = _.pickBy(parsedTables, (value, key) => _.includes(key, "Short % of Shares Outstanding"))
let shortPercentOfSharesOutStandingVal = Object.values(shortPercentOfSharesOutStanding)[0]

results = {
    symbol: ticker,

db.js

GitHub: askulysh/rmd

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const updateFile = (file) => {
  let { path } = file;
  if (!path) throw new Error("updateFile require .path");


  const newFields = _.pickBy(file, (v) => v !== undefined);


  if (CACHE[path]) {
    CACHE[path] = {
      ...CACHE[path],

+ 11 other calls in file

retail.js

GitHub: tanakorncode/sys-test

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const traders1 = _.filter(contractlist, (item) => item.ret_code === retail.ret_code)
const traders2 = _.filter(pricelist, (item) => item.ret_code === retail.ret_code)
const traders = _.uniqBy(traders1.concat(traders2), 'trd_code')

// ลบ field ที่มีค่า null ออก
retail = _.pickBy(retail, (v) => v !== null && v !== undefined && v !== '')
// ลบ field ที่ไม่ต้องการนำเข้าข้อมูลออก
let retattributes = _.omit(retail, [
  'fax',
  'create_by',

+ 3 other calls in file

update.js

GitHub: cym31153/arknights-toolbox

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  } else console.log('No need to update base skill data.');
});


function parseElites(source) {
  const elites = [];
  const data = _.pickBy(source, (v, k) => /^精\d+材料\d+$/.test(k));
  _.each(data, (v, k) => {
    if (!(v = getCorrectMaterialName(v))) return;
    const index = /^精(?<index>\d+)材料\d+$/.exec(k).groups.index - 1;
    if (!elites[index]) elites[index] = {};

+ 19 other calls in file

update.js

GitHub: cym31153/arknights-toolbox

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    {}
  );
  Object.freeze(character);
}
const nameId2Name = _.transform(
  _.pickBy(characterTable, (v, k) => k.startsWith('char_')),
  (obj, { name }, id) => {
    const shortId = id.replace(/^char_/, '');
    obj[shortId] = name;
    if (recruitmentList.includes(name)) character[shortId].recruitment.push(langEnum[langShort]);

+ 29 other calls in file

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