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How to use the cloneDeep function from lodash

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

lodash.cloneDeep is a JavaScript function that creates a deep copy of an object or an array.

astrobench.js

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* var characters = [
*   { 'name': 'barney', 'age': 36 },
*   { 'name': 'fred',   'age': 40 }
* ];
*
* var deep = _.cloneDeep(characters);
* deep[0] === characters[0];
* // => false
*
* var view = {

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+ 3 other calls in file

data.js

GitHub: taskcluster/taskcluster

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  state: this.state || 'standalone',
  capacity: this.capacity || 0,
  lastModified: this.lastModified?.toJSON(),
  lastChecked: this.lastChecked?.toJSON(),
  firstClaim: this.firstClaim?.toJSON(),
  recentTasks: _.cloneDeep(this.recentTasks),
  lastDateActive: this.lastDateActive?.toJSON(),
  quarantineUntil: this.quarantineUntil?.toJSON(),
  quarantineDetails: this.quarantineDetails || [],
};

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+ 3 other calls in file

How does lodash.cloneDeep work?

lodash.cloneDeep is a function in the Lodash library that creates a deep copy of a given object or array. When lodash.cloneDeep is called with an object or array as its argument, it creates a new object or array with the same properties or elements as the original, but all nested objects or arrays are also copied recursively. This means that the resulting copy is completely independent of the original object or array, with no references or shared memory between the two. lodash.cloneDeep can be used to create a copy of an object or array that you can modify without affecting the original object or array, which can be useful in situations where you need to manipulate data in a controlled and reversible manner. However, it's worth noting that lodash.cloneDeep can be an expensive operation, especially for large or deeply nested objects, so you should use it with care and only when necessary.

data.js

GitHub: taskcluster/taskcluster

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workerType: workerType,
taskQueueId: this.taskQueueId,
schedulerId: this.schedulerId,
projectId: this.projectId,
taskGroupId: this.taskGroupId,
dependencies: _.cloneDeep(this.dependencies),
requires: this.requires,
routes: _.cloneDeep(this.routes),
priority: this.priority,
retries: this.retries,

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+ 8 other calls in file

versionedRouter.js

GitHub: rudderlabs/rudder-transformer

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  const diff = process.hrtime(startTime);
  v0Time = diff[0] * NS_PER_SEC + diff[1];
  // Comparison is happening in async and after return from here
  // this object is getting modified so comparison was failing to
  // avoid that we are cloning it.
  return _.cloneDeep(v0Result.output);
} catch (error) {
  v0Result.error = {
    message: error.message,
    statusCode: getErrorStatusCode(error),

Ai Example

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const _ = require("lodash");

// Define an original object with nested properties
const originalObj = {
  name: "John",
  age: 30,
  address: {
    street: "123 Main St",
    city: "Anytown",
    state: "CA",
  },
};

// Create a deep copy of the original object using lodash.cloneDeep
const newObj = _.cloneDeep(originalObj);

// Modify a nested property of the new object
newObj.address.city = "Newtown";

// Output the original and new objects to the console
console.log(originalObj);
console.log(newObj);

In this example, we start by defining an original object that contains some nested properties. We then create a deep copy of the original object using lodash.cloneDeep. We modify a nested property of the new object by changing the city from 'Anytown' to 'Newtown'. We then output both the original and new objects to the console using console.log. The output of this example will show that the original object remains unchanged, while the new object has been modified: css Copy code

transform.js

GitHub: rudderlabs/rudder-transformer

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  return message;
};


const processEvent = (inputEvent) => {
  let message;
  const event = _.cloneDeep(inputEvent);
  const shopifyTopic = getShopifyTopic(event);
  delete event.query_parameters;
  switch (shopifyTopic) {
    case IDENTIFY_TOPICS.CUSTOMERS_CREATE:

ChallengeService.js

GitHub: topcoder-platform/challenge-api

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if (challenge.legacy.selfService) {
  // prettier-ignore
  sendSubmittedEmail = data.status === constants.challengeStatuses.Draft && challenge.status !== constants.challengeStatuses.Draft;

  if (data.metadata && data.metadata.length > 0) {
    let dynamicDescription = _.cloneDeep(data.description || challenge.description);
    for (const entry of data.metadata) {
      const regexp = new RegExp(`{{${entry.name}}}`, "g");
      dynamicDescription = dynamicDescription.replace(regexp, entry.value);
    }

syncDataUtils.js

GitHub: requestly/requestly

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  return latestRules;
};


export const updateUserSyncRecords = async (uid, records, appMode) => {
  const latestRules = _.cloneDeep(records);
  // Check if it's team syncing. We might not want to write some props like "isFavourite" to this node. Instead, we can write it to userConfig node
  if (window.currentlyActiveWorkspaceTeamId) {
    const syncRuleStatus = true;
    // localStorage.getItem("syncRuleStatus") === "true" || false;

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syncDataUtils.js

GitHub: requestly/requestly

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  return localRecords;
};


export const updateUserSyncRecords = async (uid, records, appMode) => {
  const localRecords = _.cloneDeep(records);
  // Check if it's team syncing. We might not want to write some props like "isFavourite" to this node. Instead, we can write it to userConfig node
  if (window.currentlyActiveWorkspaceTeamId) {
    const syncRuleStatus =
      localStorage.getItem("syncRuleStatus") === "true" || false;

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helpers.js

GitHub: feathersjs-ecosystem/feathers-swagger

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  return _.unset(object, path);
};


exports.assignWithSet = (object, ...sources) => {
  while (sources.length) {
    const source = _.cloneDeep(sources.shift());
    Object.entries(source).forEach(([key, value]) => {
      if (value === undefined) {
        return unset(object, key);
      }

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getPuppeteer.js

GitHub: gemini-testing/hermione

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const origGetPuppeteerFn = session.getPuppeteer;
let capsBeforeReset;

origGetPuppeteerFn.callsFake(() => {
    capsBeforeReset = _.cloneDeep(session.capabilities);
});

const browser = mkBrowser_({browserWSEndpoint: 'ws://new.endpoint/devtools'});

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config.js

GitHub: microrealestate/microrealestate

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CIPHER_KEY: process.env.CIPHER_KEY,
CIPHER_IV_KEY: process.env.CIPHER_IV_KEY,

log: function log() {
  const { log, ...config } = this;
  const escapedConfig = _.cloneDeep(config);
  escapedConfig.REDIS_PASSWORD = '****';
  escapedConfig.ACCESS_TOKEN_SECRET = '****';
  escapedConfig.REFRESH_TOKEN_SECRET = '****';
  escapedConfig.RESET_TOKEN_SECRET = '****';

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checks.js

GitHub: mergeability/mergeable

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const logger = require('../logger')
const _ = require('lodash')
const createCheckName = require('./lib/createCheckName')


const createChecks = async (context, payload, actionObj) => {
  const params = _.cloneDeep(payload)
  params.name = createCheckName(params.name)


  // Note: octokit (wrapped by probot) requires head_branch.
  // Contradicting API docs that only requires head_sha

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lodash-contrib.commonjs.js

GitHub: node4good/lodash-contrib

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module.exports.chunk               = _.chunk;
module.exports.chunkAll            = _.chunkAll;
module.exports.chunkContrib        = _.chunkContrib;
module.exports.clamp               = _.clamp;
module.exports.clone               = _.clone;
module.exports.cloneDeep           = _.cloneDeep;
module.exports.cloneDeepWith       = _.cloneDeepWith;
module.exports.cloneWith           = _.cloneWith;
module.exports.collate             = _.collate;
module.exports.compact             = _.compact;

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service.js

GitHub: moleculerjs/moleculer-apollo-server

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if (mixinOptions.resolvers) {
	resolvers = _.cloneDeep(mixinOptions.resolvers);
}

if (mixinOptions.schemaDirectives) {
	schemaDirectives = _.cloneDeep(mixinOptions.schemaDirectives);
}

let queries = [];
let mutations = [];

+ 7 other calls in file

adapterCache.js

GitHub: open-condo-software/condo

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        return cloneDeep(cachedItem.response)
    }
}

response = await f.apply(listAdapter, args)
const copiedResponse = cloneDeep(response)

// Note: This solution does not cache complex requests.
//       Request is considered complex if it has relations in its where query/condition.
//       Check queryIsComplex docstring for details

teams.js

GitHub: hpi-schul-cloud/schulcloud-client

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	(t) => t.schoolId === res.locals.currentSchool,
);
const studentsOfCurrentSchool = students.filter(
	(s) => s.schoolId === res.locals.currentSchool,
);
const substitutions = _.cloneDeep(teachersOfCurrentSchool);

// map course times to fit into UI
(course.times || []).forEach((time, count) => {
	time.duration = time.duration / 1000 / 60;

+ 4 other calls in file

serverHelper.js

GitHub: adessoSE/Seed-Test

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function testPassed(failed, passed) {
  return failed <= 0 && passed >= 1;
}


function setOptions(reportName, reportPath = 'features/') {
  const myOptions = lodash.cloneDeep(options);
  myOptions.metadata.Platform = process.platform;
  myOptions.name = `Seed-Test Report: ${reportName}`;
	if (reportPath !== 'features/') {
    myOptions.jsonDir = `${reportPath}`;

project.service.js

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

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}


async function addAnnotatorFromSlack(pro, slackUser) {
    console.log(`[ PROJECT ] Service addAnnotatorFromSlack`);
    let annotators = [], completeCase = [], assigneeList = [];
    annotators = _.cloneDeep(pro.annotator);
    annotators.push(slackUser)


    //to new the assigned case according to the new annotators list
    assigneeList = await evenlyDistributeTicket(annotators, pro.totalCase, pro.maxAnnotation);

+ 7 other calls in file

stow.js

GitHub: cylab-tw/raccoon

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        type: "Endpoint"
    }
];

let qidoLevelKeys = Object.keys(qidoRetAtt);
let qidoAtt = _.cloneDeep(qidoRetAtt);
for (let i = 0; i < qidoLevelKeys.length; i++) {
    let levelTags = Object.keys(qidoRetAtt[qidoLevelKeys[i]]);
    for (let x = 0; x < levelTags.length; x++) {
        let nowLevelKeyItem = qidoAtt[qidoLevelKeys[i]];

+ 5 other calls in file

basicTests.js

GitHub: AHRQ-CDS/AHRQ-CDS-Connect-Authoring-Tool

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        }
      ]
    }
  }
];
const rawStandardAndQuery = _.cloneDeep(raw);
rawStandardAndQuery.expTreeInclude.childInstances[0].modifiers = [
  {
    id: 'ActiveOrConfirmedAllergyIntolerance',
    name: 'Active Or Confirmed',

+ 53 other calls in file

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