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How to use the forIn function from lodash

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

lodash.forIn is a function in the Lodash library that iterates over own and inherited enumerable string keyed properties of an object and invokes a callback for each property.

Sort.js

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item = items[0];
sortFns = [];

if (!_.isUndefined(item) && !_.isUndefined(sort)) {
    _.forIn(sort, function (sortOrder, sortKey) {
        var itemVal, sortFn;

        itemVal = _.property(sortKey)(item);

astrobench.js

GitHub: Irrelon/ForerunnerDB

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* Shape.prototype.move = function(x, y) {
*   this.x += x;
*   this.y += y;
* };
*
* _.forIn(new Shape, function(value, key) {
*   console.log(key);
* });
* // => logs 'x', 'y', and 'move' (property order is not guaranteed across environments)
*/

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How does lodash.forIn work?

lodash.forIn is a function provided by the Lodash library that allows you to iterate over an object's own and inherited enumerable properties and execute a callback function for each property. To use lodash.forIn, you pass in an object and a callback function as arguments. The callback function will be executed for each property in the object, with the property key and value passed as arguments. lodash.forIn iterates over both the object's own properties and the properties inherited from its prototype chain, in the order that they are encountered. The lodash.forIn function returns the object that was passed in, which allows you to chain multiple Lodash functions together. lodash.forIn is one of many functions provided by the Lodash library that simplify working with arrays, objects, and functions in JavaScript. It is particularly useful when you need to iterate over an object's properties and perform a task for each property, such as copying the properties to a new object or transforming the property values.

lodash-contrib.commonjs.js

GitHub: node4good/lodash-contrib

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module.exports.flow                = _.flow;
module.exports.flowRight           = _.flowRight;
module.exports.fnull               = _.fnull;
module.exports.forEach             = _.forEach;
module.exports.forEachRight        = _.forEachRight;
module.exports.forIn               = _.forIn;
module.exports.forInRight          = _.forInRight;
module.exports.forOwn              = _.forOwn;
module.exports.forOwnRight         = _.forOwnRight;
module.exports.frequencies         = _.frequencies;

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+ 92 other calls in file

ChallengeService.js

GitHub: topcoder-platform/challenge-api

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}
if (criteria.trackId) {
  includedTrackIds.push(criteria.trackId);
}

_.forIn(_.pick(criteria, matchPhraseKeys), (value, key) => {
  if (!_.isUndefined(value)) {
    const filter = { match_phrase: {} };
    filter.match_phrase[key] = value;
    boolQuery.push(filter);

+ 8 other calls in file

Ai Example

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const _ = require("lodash");

const myObject = {
  firstName: "John",
  lastName: "Doe",
  age: 30,
};

_.forIn(myObject, (value, key) => {
  console.log(key, ":", value);
});

In this example, we first import the Lodash library and define an object myObject with three properties. We then use _.forIn to iterate over the properties of myObject and log the property key and value to the console using a callback function. The callback function takes two arguments: value, which is the value of the property being iterated over, and key, which is the key of the property being iterated over. In this example, we simply log the key and value to the console for each property, but you could use the callback function to perform a variety of tasks, such as copying the properties to a new object or transforming the property values. This example demonstrates how you can use lodash.forIn to iterate over an object's properties and perform a task for each property.

helper.js

GitHub: topcoder-platform/member-api

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function mergeSkills (memberEnteredSkill, memberAggregatedSkill, allTags) {
  // process skills in member entered skill
  if (memberEnteredSkill.hasOwnProperty('skills')) {
    let tempSkill = {}
    _.forIn(memberEnteredSkill.skills, (value, key) => {
      if (!value.hidden) {
        var tag = this.findTagById(allTags, Number(key))
        if (tag) {
          value.tagName = tag.name

+ 3 other calls in file

extend.js

GitHub: inPact/utils

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 */
traverse(obj, func, options = {}, { result = [], key, parent } = {}) {
    if (options.execObjects)
        traverseEntry(parent, obj, key, func, result, options);

    _.forIn(obj, (val, key) => {
        if (_.isArray(val))
            val.forEach(element => this.traverse(element, func, options, {
                result: result,
                key: key,

+ 15 other calls in file

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(findKey); // => 'b'


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


const forIn = _.forIn({ 'a': 1, 'b': 2 }, (value, key) => console.log(key));
// => Logs 'a' then 'b'.


const forInRight = _.forInRight({ 'a': 1, 'b': 2 }, (value, key) => console.log(key));
// => Logs 'b' then 'a'.

+ 15 other calls in file

dialCodeService.js

GitHub: Sunbird-Knowlg/knowledge-mw-service

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    tasks[element] = function (callback) {
      imageService.insertImg(element, channel, publisher, element, callback)
    }
  }
} else {
  _.forIn(dialcodes, function (index, dialcode) {
    tasks[dialcode] = function (callback) {
      var fileName = index + '_' + dialcode;
      imageService.insertImg(dialcode, channel, publisher, fileName, callback)
    }

get-trading-view.js

GitHub: inkafrog/binance-trading-bot

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if (_.isEmpty(tradingViewResult) === true) {
  // If result is empty, do not process.
  return;
}

_.forIn(tradingViewResult, (result, symbolKey) => {
  // Get symbol
  const symbol = symbolKey.replace('BINANCE:', '');

  // Set saveLog as false by default

+ 11 other calls in file

path-rewriter.js

GitHub: dewbian/blot_2023

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function parsePathRewriteRules(rewriteConfig) {
  var rules = []


  if (_.isPlainObject(rewriteConfig)) {
    _.forIn(rewriteConfig, function(value, key) {
      rules.push({
        regex: new RegExp(key),
        value: rewriteConfig[key]
      })

openaps.js

GitHub: sweetmiss0923/cgm-remote-monitor

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  });
} else {
  addSuggestion();
}

_.forIn(prop.seenDevices, function seenDevice (device) {
  var deviceInfo = [device.name];

  if (_.includes(selectedFields, 'status-symbol')) {
    deviceInfo.push(device.status.symbol);

+ 3 other calls in file

settings.js

GitHub: sweetmiss0923/cgm-remote-monitor

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}

function eachSettingAs (nameType) {

  function mapKeys (accessor, keys) {
    _.forIn(keys, function each (value, key) {
      if (isSimple(value)) {
        var newValue = accessor(nameFromKey(key, nameType));
        if (newValue !== undefined) {
          var mapper = valueMappers[key];

+ 3 other calls in file

index.js

GitHub: Benny-base/backend

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    ],
    attributes: ['key', 'label', 'component']
})
console.log(list)
const routes = []
_.forIn(_.groupBy(list, 'key'), (val, key) => {
    routes.push({
        path: key,
        label: val[0].label,
        component: val[0].component,

parse-mockdb.js

GitHub: yuske/silent-spring

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// Destructive. Takes data for update operation and removes all atomic operations.
// Returns the extracted ops.
function extractOps(data) {
  const ops = {};


  _.forIn(data, (attribute, key) => {
    if (isOp(attribute)) {
      ops[key] = attribute;
      delete data[key];
    }

+ 37 other calls in file

generateCustomMetadata.js

GitHub: Daedrico/csv-to-object

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var newR = _.clone(r)
newR.values = []

if (newR.protected === undefined) newR.protected = false

_.forIn(newR, (v, k) => {
  if (k === 'label') return
  if (k === 'protected') return
  if (k === 'values') return
  if (k === 'name') return _.unset(newR, k)

+ 3 other calls in file

models.js

GitHub: saumyatalwani/blogBack

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  types.current = 'morphTo';
}

// We have to find if they are a model linked to this key
_.forEach(allModels, model => {
  _.forIn(model.attributes, attribute => {
    if (_.has(attribute, 'via') && attribute.via === attributeName) {
      if (_.has(attribute, 'collection') && attribute.collection === modelName) {
        types.other = 'collection';

+ 4 other calls in file

model.js

GitHub: sequelize/sequelize

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// Run beforeUpdate hook
await this.hooks.runAsync('beforeUpdate', instance, options);
await this.hooks.runAsync('beforeSave', instance, options);
if (!different) {
  const thisChangedValues = {};
  _.forIn(instance.dataValues, (newValue, attr) => {
    if (newValue !== instance._previousDataValues[attr]) {
      thisChangedValues[attr] = newValue;
    }
  });

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+ 17 other calls in file

path-rewrite.js

GitHub: wenpingzheng/ssi-webpack5-plugin

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function parsePathRewriteRules(rewriteConfig) {
  var rules = [];


  if (_.isPlainObject(rewriteConfig)) {
    _.forIn(rewriteConfig, function (value, key) {
      rules.push({
        regex: new RegExp(key),
        value: rewriteConfig[key],
      });

+ 5 other calls in file

index.js

GitHub: pappukrs/nodash-lib

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//   this.c = 30;
//   this.d = 40;
// }
// foo.prototype.e = 50;
// foo.prototype.f = 20;
// lodash.forIn(new foo(), (value, key) => {
//   console.log(value);
// });
// console.log("print from last in case forInRight");
// lodash.forInRight(new foo(), (value, key) => {

+ 9 other calls in file

bgnow.js

GitHub: Ada1080915/cgm-remote-monitor

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    };
  }
});

if (_.keys(deviceInfos).length > 1) {
  _.forIn(deviceInfos, function addInfo(deviceInfo, name) {
    var display = deviceInfo.value;
    if (deviceInfo.delta) {
      display += ' ' + deviceInfo.delta;
    }

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