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How to use the filter function from lodash

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

The lodash.filter function creates a new array of elements that pass a given test function.

listPage.jsx

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},

getSortedBrews : function(brews){
	const testString = _.deburr(this.state.filterString).toLowerCase();

	brews = _.filter(brews, (brew)=>{
		const brewStrings = _.deburr([
			brew.title,
			brew.description,
			brew.tags].join('\n')

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+ 9 other calls in file

album.js

GitHub: thumbsup/thumbsup

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const nestedVideos = _.map(this.albums, 'stats.videos')
const nestedFromDates = _.map(this.albums, 'stats.fromDate')
const nestedToDates = _.map(this.albums, 'stats.toDate')
// current level
const currentPhotos = _.filter(this.files, { type: 'image' }).length
const currentVideos = _.filter(this.files, { type: 'video' }).length
const currentFromDate = _.map(this.files, 'meta.date')
const currentToDate = _.map(this.files, 'meta.date')
// aggregate all stats
this.stats = {

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+ 9 other calls in file

How does lodash.filter work?

The lodash.filter function is a utility function in the Lodash library that creates a new array of elements that pass a given test function. The function takes two arguments: the first argument is the array to be filtered, and the second argument is the test function. The test function is called for each element in the array and should return a boolean value indicating whether the element should be included in the filtered array. If the test function returns true for an element, the element is included in the new array. If the test function returns false, the element is excluded from the new array. The lodash.filter function does not modify the original array; instead, it returns a new array that contains only the elements that passed the test. The order of elements in the filtered array is the same as in the original array. For example, the following code uses lodash.filter to create a new array of even numbers: javascript Copy code {{{{{{{ const _ = require('lodash'); const numbers = [1, 2, 3, 4, 5, 6]; const evenNumbers = _.filter(numbers, (num) => { return num % 2 === 0; }); console.log(evenNumbers); // Output: [2, 4, 6] In this example, we have an array of numbers and use lodash.filter to create a new array of even numbers. We pass the numbers array as the first argument and a test function that returns true for even numbers and false for odd numbers. The resulting evenNumbers array contains only the even numbers from the original array, [2, 4, 6]. Overall, the lodash.filter function provides a convenient way to create a new array that contains only the elements that satisfy a given condition.

astrobench.js

GitHub: Irrelon/ForerunnerDB

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 *   return !match ? func(callback, thisArg) : function(object) {
 *     return match[2] == 'gt' ? object[match[1]] > match[3] : object[match[1]] < match[3];
 *   };
 * });
 *
 * _.filter(characters, 'age__gt38');
 * // => [{ 'name': 'fred', 'age': 40 }]
 */
function createCallback(func, thisArg, argCount) {
  var type = typeof func;

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+ 7 other calls in file

helpers.js

GitHub: gemini-testing/hermione

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    if (_.find(formattedTests, testItem)) {
        return;
    }

    const browsers = _.filter(tests, testItem);
    formattedTests.push(_.extend(testItem, {browsers}));
});

return formattedTests;

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+ 6 other calls in file

Ai Example

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const _ = require("lodash");

const data = [
  { id: 1, name: "John", age: 25 },
  { id: 2, name: "Alice", age: 30 },
  { id: 3, name: "Bob", age: 40 },
  { id: 4, name: "Jane", age: 35 },
];

const result = _.filter(data, (item) => {
  return (item.age = 30);
});

console.log(result);
// Output: [{ id: 2, name: 'Alice', age: 30 }, { id: 3, name: 'Bob', age: 40 }, { id: 4, name: 'Jane', age: 35 }]

In this example, we have an array of objects called data, where each object represents a person with an id, name, and age. We use lodash.filter to create a new array that contains only the people who are 30 years or older. We pass data as the first argument and a test function as the second argument that checks whether the age property of each object is greater than or equal to 30. The resulting result array contains only the objects that passed the test, which are the people who are 30 years or older. The output of the console.log statement shows the resulting array. Overall, lodash.filter is a useful utility function for filtering an array based on a given condition.

utils.js

GitHub: compdemocracy/polis

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  return newItems;
}


function getBestTranslation(translations, lang) {
  var firstTwoOfLang = lang.substr(0,2);
  var matchingLang = _.filter(translations, function(t) {
    return t.lang.indexOf(firstTwoOfLang) === 0;
  });
  matchingLang.sort(function(a, b) {
    if (a.lang !== b.lang) {

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+ 4 other calls in file

HostManager.js

GitHub: firewalla/firewalla

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    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

manager.js

GitHub: pocketnetteam/pocketnet.gui

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//return Promise.resolve()

return node.peers().then(nodes => {
    

    nodes = _.filter(nodes, function(n){
        return !self.nodesmap[n.key] && !self.peers[n.key]
    })

    _.each(nodes, function(n){

+ 111 other calls in file

proxy.js

GitHub: pocketnetteam/pocketnet.gui

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var posts = r.data.contents || []

	result = r

posts = _.filter(posts, p => {
	return p
})

var withvideos = _.filter(posts, p => {

+ 31 other calls in file

assert-runtime.js

GitHub: usebruno/bruno

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  return evaluateJsTemplateLiteral(rhsOperand, context);
};


class AssertRuntime {
  runAssertions(assertions, request, response, envVariables, collectionVariables, collectionPath) {
    const enabledAssertions = _.filter(assertions, (a) => a.enabled);
    if(!enabledAssertions.length) {
      return [];
    }

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utils.js

GitHub: mingdaocom/pd-openweb

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    return asset.emitted;
  })
  .value();
title =
  '生成' +
  _.filter(assets, function (asset) {
    return _.endsWith(asset.name, '.js');
  }).length +
  '个js文件,' +
  _.filter(assets, function (asset) {

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archive.js

GitHub: SchneeHertz/exhentai-manga-manager

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  await spawnPromise(_7z, ['x', filepath, '-o' + tempFolder, '-p123456'])
  let list = await promisify(glob)('**/*.@(jpg|jpeg|png|webp|avif|gif)', {
    cwd: tempFolder,
    nocase: true
  })
  list = _.filter(list, s=>!_.includes(s, '__MACOSX'))
  list = list.sort((a,b)=>a.localeCompare(b, undefined, {numeric: true, sensitivity: 'base'})).map(f=>path.join(tempFolder, f))
  return list
}

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+ 47 other calls in file

zip.js

GitHub: SchneeHertz/exhentai-manga-manager

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let zipFileList = zip.getEntries()
let findZFile = (entryName)=>{
  return _.find(zipFileList, zFile=>zFile.entryName == entryName)
}
let fileList = zipFileList.map(zFile=>zFile.entryName)
let imageList = _.filter(fileList, filepath=>_.includes(['.jpg', ',jpeg', '.png', '.webp', '.avif', '.gif'], path.extname(filepath).toLowerCase()))
imageList = imageList.sort((a,b)=>a.localeCompare(b, undefined, {numeric: true, sensitivity: 'base'}))

let targetFile
let targetFilePath

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index.js

GitHub: sergeyksv/tinelic

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	}, safe.sure(cb,function () {
		cb(null,result);
	}));
},
getGrantedIds:function (t, p, cb) {
	var acl = _.filter(_acl, function (a) {
		return a.r.test(p.action);
	});
	var checks = [];
	_.each(acl, function (a) {

ChallengeService.js

GitHub: topcoder-platform/challenge-api

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 * @param {Array} winners the Winner Array
 * @param {String} winchallengeIdners the challenge ID
 */
async function validateWinners(winners, challengeId) {
  const challengeResources = await helper.getChallengeResources(challengeId);
  const registrants = _.filter(challengeResources, (r) => r.roleId === config.SUBMITTER_ROLE_ID);
  for (const prizeType of _.values(constants.prizeSetTypes)) {
    const filteredWinners = _.filter(winners, (w) => w.type === prizeType);
    for (const winner of filteredWinners) {
      if (!_.find(registrants, (r) => _.toString(r.memberId) === _.toString(winner.userId))) {

+ 2 other calls in file

ChallengeService.js

GitHub: topcoder-platform/challenge-api

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const needToCheckForGroupAccess = !currentUser
  ? true
  : !currentUser.isMachine && !hasAdminRole(currentUser);
const subGroupsMap = {};
for (const challenge of challenges) {
  challenge.groups = _.filter(
    challenge.groups,
    (g) => !_.includes(["null", "undefined"], _.toString(g).toLowerCase())
  );
  let expandedGroups = [];

+ 11 other calls in file

phase-helper.js

GitHub: topcoder-platform/challenge-api

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async validatePhases(phases) {
  if (!phases || phases.length === 0) {
    return;
  }
  const { phaseDefinitionMap } = await this.getPhaseDefinitionsAndMap();
  const invalidPhases = _.filter(phases, (p) => !phaseDefinitionMap.has(p.phaseId));
  if (invalidPhases.length > 0) {
    throw new errors.BadRequestError(
      `The following phases are invalid: ${toString(invalidPhases)}`
    );

+ 4 other calls in file

helper.js

GitHub: topcoder-platform/challenge-api

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  _.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

+ 5 other calls in file

ChallengeTimelineTemplateService.js

GitHub: topcoder-platform/challenge-api

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 */
async function searchChallengeTimelineTemplates (criteria) {
  let records = await helper.scanAll('ChallengeTimelineTemplate')
  if (criteria.typeId) records = _.filter(records, e => (criteria.typeId === e.typeId))
  if (criteria.trackId) records = _.filter(records, e => (criteria.trackId === e.trackId))
  if (criteria.timelineTemplateId) records = _.filter(records, e => (criteria.timelineTemplateId === e.timelineTemplateId))
  if (!_.isUndefined(criteria.isDefault)) records = _.filter(records, e => (e.isDefault === (_.toLower(_.toString(criteria.isDefault)) === 'true')))
  return {
    total: records.length,
    page: 1,

+ 31 other calls in file

PhaseService.js

GitHub: topcoder-platform/challenge-api

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 */
async function searchPhases (criteria) {
  const page = criteria.page || 1
  const perPage = criteria.perPage || 50
  const list = await helper.scanAll('Phase')
  const records = _.filter(list, e => helper.partialMatch(criteria.name, e.name))
  const total = records.length
  const result = records.slice((page - 1) * perPage, page * perPage)


  return { total, page, perPage, result }

+ 7 other calls in file

helper.js

GitHub: topcoder-platform/challenge-api

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if (!needToCheckForGroupAccess) return challenges

let userGroups

for (const challenge of challenges) {
  challenge.groups = _.filter(challenge.groups, g => !_.includes(['null', 'undefined'], _.toString(g).toLowerCase()))
  if (!challenge.groups || _.get(challenge, 'groups.length', 0) === 0 || !needToCheckForGroupAccess) {
    res.push(challenge)
  } else if (currentUser) {
    if (_.isNil(userGroups)) {

+ 15 other calls in file

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