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How to use the isUndefined function from lodash

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

lodash.isUndefined is a method in the Lodash JavaScript library that checks whether a value is undefined.

astrobench.js

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 * @category Objects
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if the `value` is `undefined`, else `false`.
 * @example
 *
 * _.isUndefined(void 0);
 * // => true
 */
function isUndefined(value) {
  return typeof value == 'undefined';

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utils.js

GitHub: compdemocracy/polis

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}


function userCanSeeFooter() {
  var params = parseQueryParams(window.location.search);
  var ucsf = params.ucsf;
  ucsf = (ucsf === "true" || ucsf === "1" || _.isUndefined(ucsf));
  if (!ucsf) {
    ucsf = true;
  }
  return ucsf;

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+ 34 other calls in file

How does lodash.isUndefined work?

lodash.isUndefined is a method in the Lodash JavaScript library that checks whether a value is undefined. When you call lodash.isUndefined, you pass in a value that you want to check. The method then checks whether the value is strictly equal to undefined, meaning that it has not been defined or has been explicitly set to undefined. lodash.isUndefined returns true if the value is undefined and false otherwise. This allows you to easily check whether a given value is undefined in your code. Note that lodash.isUndefined is just one of many utility methods in the Lodash library that allow you to manipulate and work with JavaScript data in a flexible and modular way. By using these methods, you can simplify your code and avoid common pitfalls and errors.

node.js

GitHub: cubedro/eth-net-intelligence-api

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var history = [];
var interv = [];

console.time('=H=', 'his', 'Got history in');

if ( _.isUndefined(range) || range === null)
	interv = _.range(this.stats.block.number - 1, this.stats.block.number - MAX_HISTORY_UPDATE);

if (!_.isUndefined(range.list))
	interv = range.list;

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namespace_fs.js

GitHub: noobaa/noobaa-core

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if (delimiter && delimiter !== '/') {
    throw new Error('NamespaceFS: Invalid delimiter ' + delimiter);
}

const limit = Math.min(1000, _.isUndefined(params.limit) ? 1000 : params.limit);
if (limit < 0) throw new Error('Limit must be a positive Integer');
// In case that we've received max-keys 0, we should return an empty reply without is_truncated
// This is used in order to follow aws spec and behaviour
if (!limit) return { is_truncated: false, objects: [], common_prefixes: [] };

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Ai Example

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const _ = require("lodash");

// Define a variable with an undefined value
let foo;

// Check whether the variable is undefined using `_.isUndefined`
if (_.isUndefined(foo)) {
  console.log("foo is undefined!");
} else {
  console.log("foo is defined!");
}

In this example, we start by requiring the lodash library and defining a variable called foo with an undefined value. We then use _.isUndefined to check whether foo is undefined. In this case, the method will return true, indicating that foo is indeed undefined. Finally, we log a message to the console based on the result of the _.isUndefined check. Note that lodash.isUndefined is just one of many utility methods in the Lodash library that allow you to manipulate and work with JavaScript data in a flexible and modular way. By using these methods, you can simplify your code and avoid common pitfalls and errors.

build-campaign.js

GitHub: 1024pix/pix

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  customResultPageButtonUrl = null,
  multipleSendings = false,
  assessmentMethod,
} = {}) {
  if (type === CampaignTypes.ASSESSMENT && !assessmentMethod) {
    targetProfileId = _.isUndefined(targetProfileId)
      ? buildTargetProfile({ ownerOrganizationId: organizationId }).id
      : targetProfileId;
    assessmentMethod = Assessment.methods.SMART_RANDOM;
  }

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+ 3 other calls in file

common.js

GitHub: jumpserver/lina

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export function sleep(time) {
  return new Promise((resolve) => setTimeout(resolve, time))
}


function customizer(objValue, srcValue) {
  return _.isUndefined(objValue) ? srcValue : objValue
}


export function newURL(url) {
  let obj

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lodash-contrib.commonjs.js

GitHub: node4good/lodash-contrib

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module.exports.isSequential        = _.isSequential;
module.exports.isSet               = _.isSet;
module.exports.isString            = _.isString;
module.exports.isSymbol            = _.isSymbol;
module.exports.isTypedArray        = _.isTypedArray;
module.exports.isUndefined         = _.isUndefined;
module.exports.isValidDate         = _.isValidDate;
module.exports.isWeakMap           = _.isWeakMap;
module.exports.isWeakSet           = _.isWeakSet;
module.exports.isZero              = _.isZero;

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+ 92 other calls in file

ChallengeService.js

GitHub: topcoder-platform/challenge-api

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const projectId = _.get(challenge, "projectId");

const { billingAccountId, markup } = await projectHelper.getProjectBillingInformation(projectId);

if (billingAccountId && _.isUndefined(_.get(challenge, "billing.billingAccountId"))) {
  _.set(data, "billing.billingAccountId", billingAccountId);
  _.set(data, "billing.markup", markup || 0);
}

helper.js

GitHub: topcoder-platform/challenge-api

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  if (currentUser) {
    if (!currentUser.isMachine) {
      memberResources = await listResourcesByMemberAndChallenge(currentUser.userId, challenge.id)
    }
  }
  const canAccesChallenge = _.isUndefined(currentUser) ? false : currentUser.isMachine || hasAdminRole(currentUser) || !_.isEmpty(memberResources)
  if (!canAccesChallenge) {
    throw new errors.ForbiddenError(`You don't have access to view this challenge`)
  }
}

+ 7 other calls in file

phase-helper.js

GitHub: topcoder-platform/challenge-api

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    .add(updatedPhase.duration, "seconds")
    .toDate()
    .toISOString();
}
if (
  _.isUndefined(phase.actualEndDate) &&
  !_.isUndefined(newPhase) &&
  !_.isUndefined(newPhase.constraints)
) {
  updatedPhase.constraints = newPhase.constraints;

+ 4 other calls in file

artifact.js

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

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  //modified from: https://stackoverflow.com/questions/286141/remove-blank-attributes-from-an-object-in-javascript
  const removeEmpty = retVal =>
    Object.keys(retVal).forEach(key => {
      if (retVal[key] && typeof retVal[key] === 'object') removeEmpty(retVal[key]);
      // recurse
      else if (_.isEmpty(retVal[key]) || _.isUndefined(retVal[key]) || _.isNull(retVal[key])) delete retVal[key];
    });
  removeEmpty(retVal);
  return retVal;
};

helper.js

GitHub: topcoder-platform/challenge-api

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if (currentUser) {
  if (!currentUser.isMachine) {
    memberResources = await listResourcesByMemberAndChallenge(currentUser.userId, challenge.id);
  }
}
const canAccesChallenge = _.isUndefined(currentUser)
  ? false
  : currentUser.isMachine || hasAdminRole(currentUser) || !_.isEmpty(memberResources);
if (!canAccesChallenge) {
  throw new errors.ForbiddenError(`You don't have access to view this challenge`);

toPgn.js

GitHub: canboat/canboatjs

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}


function writeField(bs, pgn_number, field, data, value, bitLength) {
  var startPos = bs.byteIndex


  if ( _.isUndefined(bitLength) ) {
    bitLength = field.BitLength
  }


  // console.log(`${field.Name}:${value}(${bitLength}-${field.Resolution})`)

+ 5 other calls in file

fromPgn.js

GitHub: canboat/canboatjs

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const ignoredPgns = []//130820, 126720 ]


class Parser extends EventEmitter {
  constructor (opts) {
    super()
    this.options = _.isUndefined(opts) ? {} : opts


    this.name = pkg.name
    this.version = pkg.version
    this.author = pkg.author

+ 3 other calls in file

SupportObjectGenerator.js

GitHub: DaTebe/destroyclaims

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  throw new TypeError(
    "SupportObjectGenerator: evaluation must be of type Object"
  );
}
if (
  _.isUndefined(evaluation.evaluation) ||
  !_.isFunction(evaluation.evaluation)
) {
  throw new TypeError(
    "SupportObjectGenerator: evaluation key in evaluation parameter must be set and of type Function"

+ 3 other calls in file

scripts.js

GitHub: mekomsolutions/openmrs-cd

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 * foo + false ➔  foo
 * foo/ + false ➔  foo
 * foo/ + true ➔  foo/
 */
trailSlash: function(dirPath, slash) {
  if (_.isNull(slash) || _.isUndefined(slash)) {
    return dirPath;
  }
  if (typeof slash != typeof true) {
    throw Error("Illegal argument: boolean expected: " + slash);

+ 10 other calls in file

stack.js

GitHub: clabroche/stack-monitor

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 * @param  {Object} toObject   Object to compare with
 * @return {Object}        Return a new object who represent the diff
 */
function difference(fromObject, toObject) {
  const changes = {}
  const buildPath = (_path, key) => _.isUndefined(_path) ? key : `${_path}.${key}`
  const walk = (_fromObject, _toObject, _path) => {
    for (const key of _.keys(_fromObject)) {
      const currentPath = buildPath(_path, key)
      if (!_.has(_toObject, key)) {

+ 8 other calls in file

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(isSymbol); // => true


const isTypedArray = _.isTypedArray(new Uint8Array);
console.log(isTypedArray); // => true


const isUndefined = _.isUndefined(undefined);
console.log(isUndefined); // => true


const isWeakMap = _.isWeakMap(new WeakMap);
console.log(isWeakMap); // => true

+ 15 other calls in file

ratiocalculationController.js

GitHub: pchanas/KibanaRatioCalculation

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const tabifyAggResponse = Private(require('ui/agg_response/tabify/tabify'));
const ratios = $scope.ratios = [];
const localNumerator = $scope.localNumerator = 0

function isInvalid(val) {
  return _.isUndefined(val) || _.isNull(val) || _.isNaN(val);
}

$scope.processTableGroups = function (tableGroups, hitsCount) {
    console.log("tableGroups : ", tableGroups)

+ 13 other calls in file

settingsUtil.js

GitHub: polonel/trudesk

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function parseSetting (settings, name, defaultValue) {
  let s = _.find(settings, function (x) {
    return x.name === name
  })
  s = _.isUndefined(s) ? { value: defaultValue } : s


  return s
}

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