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How to use the isEmpty function from underscore

Find comprehensive JavaScript underscore.isEmpty code examples handpicked from public code repositorys.

underscore.isEmpty checks if a given value is an empty object, collection, map or set.

leaflet-measure.js

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// See [WebKit Bug 80797](https://bugs.webkit.org/show_bug.cgi?id=80797)
_.max = function(obj, iterator, context) {
  if (!iterator && _.isArray(obj) && obj[0] === +obj[0] && obj.length < 65535) {
    return Math.max.apply(Math, obj);
  }
  if (!iterator && _.isEmpty(obj)) return -Infinity;
  var result = {computed : -Infinity, value: -Infinity};
  each(obj, function(value, index, list) {
    var computed = iterator ? iterator.call(context, value, index, list) : value;
    computed > result.computed && (result = {value : value, computed : computed});

message-template-async.js

GitHub: joneslee0918/Chat-Extend-Node

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const _ = require('underscore');
const utils = require('./helpers/utils');
const when = utils.when;
const moment = require('moment');


const isEmpty = value => _.isEmpty(value) && !_.isNumber(value);
const byString = function(o, s) {
  let str = s.replace(/\[(\w+)\]/g, '.$1'); // convert indexes to properties
  str = str.replace(/^\./, '');           // strip a leading dot
  var a = str.split('.');

How does underscore.isEmpty work?

The _.isEmpty function of Underscore.js library is used to determine whether the given value is an empty object or not. If the given value is null or undefined, the function returns true. If the given value is an object with no enumerable properties or an empty array, the function returns true. Otherwise, it returns false.

validator.js

GitHub: nishchaldv/avro-website

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this.branchNames = function() {
  return _.map(typeSchemas, function(typeSchema) { return makeFullyQualifiedTypeName(typeSchema, namespace); });
};

function validateArgs(typeSchemas) {
  if (!_.isArray(typeSchemas) || _.isEmpty(typeSchemas)) {
    throw new InvalidSchemaError('Union must have at least 1 branch');
  }
}

index.js

GitHub: christinadivya/bot-one-one

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let userId = data.userId;
// let onlineMember = getOnlineUsers();
// let checkUserOnline = _.forEach(onlineMember, function (result) {
//    return result
// }) 
//  let isUserOffline = _.isEmpty(checkUserOnline);

 let isUserOffline ;
 _.forEach(onlineUsersInSocket, function (result) {
 console.log(result)

Ai Example

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const _ = require("underscore");

const obj = {};
const arr = [];

console.log(_.isEmpty(obj)); // true
console.log(_.isEmpty(arr)); // true

In this example, we require the underscore library and create an empty object obj and an empty array arr. We then use the _.isEmpty function to check if both obj and arr are empty. The function returns true for both cases since they are indeed empty.

commands.js

GitHub: benjamn/meteor

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 * everywhere else
 */
var dontBuildMobileOnWindows = function (platforms, options) {
  options = options || {};

  if (! _.isEmpty(platforms) && process.platform === "win32") {
    // Default message to print when we can't Cordova on Windows
    var MESSAGE_NOTHING_ON_WINDOWS =
      "Currently, it is not possible to build mobile apps on a Windows system.";

util.js

GitHub: gautam-16/prod

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    length = 6;
} else {
    // nothing to do
}

if (!inputChars || _.isEmpty(inputChars)) {
    inputChars = '0123456789';
} else {
    // nothing to do
}

+ 3 other calls in file

app.js

GitHub: gdavies26/easysoundtest.com-investigation

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var lon = req.body.lon;
var confirmed = true;
*/

// Validation
if (_.isEmpty(date) || !postcode || _.isEmpty(starttime) || starttime == '00:00' || _.isEmpty(endtime) || endtime == '00:00') {
    var docs = {
        // Test details
        date: date, // Date
        engineer: engineer,

ethereumjs-accounts.js

GitHub: budiyosan91/bulk-eth-address

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Accounts.prototype.contains = function(address){
    var accounts = LocalStore.get(this.options.varName);


    if(_.isUndefined(address)
       || _.isEmpty(address))
        return false;


    // Add '0x' prefix if not available
    address = formatAddress(address);

+ 3 other calls in file

flows.trigger.js

GitHub: 444748104/oa

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        this.data.values = this.data.values.concat(flowDatas)
    }
},
afterFindOne: async function(){
    let id = this.id;
    if(id && _.isEmpty(this.data.values) && this.spaceId === 'template'){
        this.data.values = _.find(getFlows(), function(flow){
            return flow._id === id;
        })
    }

aldeed_collection2-core.js

GitHub: NadeemBeg/shopSkip-liquor_app

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* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is empty, else `false`.
* @example
*
* _.isEmpty(null);
* // => true
*
* _.isEmpty(true);
* // => true

+ 9 other calls in file

mex.js

GitHub: haithemhaamdi/AzureAD

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         bindings[bindingName] = bindingPolicy;
      }
    }
  }
  return _.isEmpty(bindings) ? null : bindings;
};


/**
* Ensures that a url points to an SSL endpoint.

linker.js

GitHub: musically-ut/meteor

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    assignedVariables = assignedVariables.concat(
      file.computeAssignedVariables());
  });
  assignedVariables = _.uniq(assignedVariables);

  return _.isEmpty(assignedVariables) ? undefined : assignedVariables;
},

// Output is a list of objects with keys 'source', 'servePath', 'sourceMap',
// 'sourcePath'

+ 5 other calls in file

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