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How to use the transform function from lodash

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

lodash.transform is a function in the lodash library that iterates over an object's properties and applies a function to them to transform them into a new object.

astrobench.js

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*     return result.push(num) < 3;
*   }
* });
* // => [1, 9, 25]
*
* var mapped = _.transform({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) {
*   result[key] = num * 3;
* });
* // => { 'a': 3, 'b': 6, 'c': 9 }
*/

711

+ 3 other calls in file

common.js

GitHub: jumpserver/lina

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  a.click()
  window.URL.revokeObjectURL(url)
}


export function diffObject(object, base) {
  return _.transform(object, (result, value, key) => {
    if (!_.isEqual(value, base[key])) {
      result[key] = (_.isObject(value) && _.isObject(base[key])) ? diffObject(value, base[key]) : value
    }
  })

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How does lodash.transform work?

lodash.transform is a higher-order function that takes an object, a function to apply to its properties, and an optional accumulator object as arguments. The function iterates over the object's own enumerable properties using a for...in loop and applies the given function to each property, passing the current value, key, and the accumulator object as arguments. If the accumulator object is not provided, lodash.transform initializes an empty object as the accumulator. The result of the transformation is the final accumulator object, which contains the transformed values for each property in the original object. If the provided accumulator object is modified during the iteration, the modified object is returned as the result instead of a new object. Here's the basic syntax of lodash.transform: javascript Copy code {{{{{{{ _.transform(object, [iteratee=_.identity], [accumulator]) object: The object to iterate over. iteratee: The function to apply to each property. It takes three arguments: (value, key, accumulator). accumulator: An optional object to use as the accumulator. If not provided, an empty object is used. And here's an example of how you might use lodash.transform to create a new object by squaring the values of the properties of an existing object: javascript Copy code {{{{{{{ class="!whitespace-pre hljs language-javascript">const _ = require('lodash'); const original = { a: 2, b: 3, c: 4 }; const transformed = _.transform(original, (result, value, key) => { result[key] = value ** 2; }, {}); console.log(transformed); // { a: 4, b: 9, c: 16 } In this example, we use lodash.transform to create a new object transformed with the same properties as original, but with their values squared. The iteratee function takes the current value, key, and result (which is initially an empty object) as arguments, and assigns the squared value to the corresponding property in result. The final result is { a: 4, b: 9, c: 16 }.

lodash-contrib.commonjs.js

GitHub: node4good/lodash-contrib

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module.exports.toQuery             = _.toQuery;
module.exports.toSafeInteger       = _.toSafeInteger;
module.exports.toString            = _.toString;
module.exports.toUpper             = _.toUpper;
module.exports.trampoline          = _.trampoline;
module.exports.transform           = _.transform;
module.exports.trim                = _.trim;
module.exports.trimEnd             = _.trimEnd;
module.exports.trimStart           = _.trimStart;
module.exports.truncate            = _.truncate;

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+ 92 other calls in file

epic-tickets.js

GitHub: dylang/jira-improved

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    });

}

function processIssues(issues) {
    return _.transform(issues, function(result, issue) {
        let parentKey = issue.fields[customFields.epicLink()];
        let color = issue.fields.status.statusCategory.colorName;

        result[parentKey] = result[parentKey] || {};

Ai Example

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const _ = require("lodash");

const obj = { a: 1, b: 2, c: 3 };

const sum = _.transform(
  obj,
  (acc, val) => {
    acc.sum += val;
  },
  { sum: 0 }
).sum;

console.log(sum); // Output: 6

In this example, we're using lodash.transform to iterate over the obj object and calculate the sum of its values. The iteratee function takes two arguments: acc (which is an object containing the running total) and val (which is the current value being iterated over). We then add the current value to the acc.sum property in the iteratee function. Finally, we pass an initial accumulator object to _.transform that contains a sum property initialized to 0. The result of the transformation is the final acc object, which contains the sum property with the total sum of the object's values. We then use .sum to access the sum property and log it to the console, which outputs 6.

Utils.js

GitHub: PastVu/pastvu

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result = {
    agent,
    version,
    badbrowser: isBadbrowser,
    polyfills: isBadbrowser ? {} : _.transform(polyfillFreelist, (result, browsers, polyfill) => {
        const browser = browsers[family];

        result[polyfill] = !browser || !semver.satisfies(versionString, browser);
    }),

basicTests.js

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

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 * @param  {Object} base   Object to compare with
 * @return {Object}        Return a new object who represent the diff
 */
function difference(object, base) {
  function changes(object, base) {
    return _.transform(object, function (result, value, key) {
      if (!_.isEqual(value, base[key])) {
        result[key] = _.isObject(value) && _.isObject(base[key]) ? changes(value, base[key]) : value;
      }
    });

+ 2 other calls in file

utils.js

GitHub: bcgov/EDUC-STUDENT-ADMIN

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    log.error(functionName, ' Error', e.stack);
  }
}


function minify(obj, keys = ['documentData']) {
  return lodash.transform(obj, (result, value, key) =>
    result[key] = keys.includes(key) && lodash.isString(value) ? value.substring(0, 1) + ' ...' : value);
}


async function logResponseData(url, response, operationType) {

api.js

GitHub: Igor-lkm/koa-joi-router-docs-v2

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const generator = require('./generator');
const each = require('lodash/each');
const _ = require('lodash');


function _replaceKeysDeep(obj, keysMap) {
  return _.transform(obj, (result, value, key) => {
    // transform to a new object
    const currentKey = keysMap[key] || key;


    // eslint-disable-next-line no-param-reassign

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(toPairs); // => [['a', 1], ['b', 2]]


const toPairsIn = _.toPairsIn({ 'a': 1, 'b': 2 });
console.log(toPairsIn); // => [['a', 1], ['b', 2]]


const transform = _.transform({ 'a': 1, 'b': 2, 'c': 1 }, (result, value, key) => {
    (result[value] || (result[value] = [])).push(key);
    }, {});
console.log(transform); // => { '1': ['a', 'c'], '2': ['b'] }

+ 15 other calls in file

db.service.js

GitHub: OzZaken/airbnb

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// Loop through each object in the collection
return map(collection, (obj) => {

    // Loop through each key-value pair in the object
    return transform(obj, (newObj, value, key) => {

        // Check if the value is an ID in the idMap
        const newId = find(idMap, (v, k) => k === value)

+ 2 other calls in file

post.js

GitHub: nodejs-tutorials/hello-ghost

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findOne: function findOne(data, options) {
    options = options || {};

    var withNext = _.contains(options.include, 'next'),
        withPrev = _.contains(options.include, 'previous'),
        nextRelations = _.transform(options.include, function (relations, include) {
            if (include === 'next.tags') {
                relations.push('tags');
            } else if (include === 'next.author') {
                relations.push('author');

+ 3 other calls in file

util.js

GitHub: MobiDataLab/mdl-catalog-deployment

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}


exports.getYamlFiles = function (pattern, dir) {
  dir = dir || '';
  var files = glob.sync(dir + pattern);
  return _.transform(files, function (result, filename) {
    result[filename] = exports.readYaml(filename);
  }, {});
}

+ 9 other calls in file

index.js

GitHub: jamesbr90/data-jkls-snowflake-dialect

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const wrapIdentifier = (value, wrap) => {
  return wrap(value ? value.toUpperCase() : value);
};


function mapObject(obj) {
  return _.transform(
    obj,
    (result, value, key) => {
      result[key.toUpperCase()] = value;
    },

+ 2 other calls in file

ci_provider.js

GitHub: cypress-io/cypress

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const toCamelObject = (obj, key) => {
  return _.set(obj, _.camelCase(key), process.env[key])
}


const extract = (envKeys) => {
  return _.transform(envKeys, toCamelObject, {})
}


/**
 * Returns true if running on TeamFoundation server.

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update.js

GitHub: cym31153/arknights-toolbox

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const avatarDir = Path.join(__dirname, '../public/assets/img/avatar');
const joymeURL = 'http://wiki.joyme.com/arknights/%E5%B9%B2%E5%91%98%E6%95%B0%E6%8D%AE%E8%A1%A8';
const materialData = Fse.readJsonSync(Path.join(__dirname, '../src/data/material.json'));
const materials = _.map(materialData, m => m.name);
const materialPinyin = _.transform(
  materialData,
  (o, { name, pinyin }) => {
    o[pinyin] = name;
  },

+ 9 other calls in file

update.js

GitHub: cym31153/arknights-toolbox

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  ja: 'ja_JP',
  ko: 'ko_KR',
};
Object.freeze(langList);
const getDataURL = lang =>
  _.transform(
    [
      'character_table.json',
      'building_data.json',
      'skill_table.json',

+ 59 other calls in file

analyzer.js

GitHub: Hastorga105/VueJS-Production-Dashboard

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    logger.warn('\nNo bundles were parsed. Analyzer will show only original module sizes from stats file.\n');
  }
}

var modules = getBundleModules(bundleStats);
var assets = _.transform(bundleStats.assets, function (result, statAsset) {
  var asset = result[statAsset.name] = _.pick(statAsset, 'size');

  if (bundlesSources && _.has(bundlesSources, statAsset.name)) {
    asset.parsedSize = bundlesSources[statAsset.name].length;

+ 9 other calls in file

screenshots.js

GitHub: sindeshiva/Test

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}


const crop = function (image, dimensions, pixelRatio = 1) {
  debug('dimensions before are %o', dimensions)


  dimensions = _.transform(dimensions, (result, value, dimension) => {
    return result[dimension] = value * pixelRatio
  })


  debug('dimensions for cropping are %o', dimensions)

analyzer.js

GitHub: NJUyd2001/2023_NJUspringE-

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    logger.warn('\nNo bundles were parsed. Analyzer will show only original module sizes from stats file.\n');
  }
}

const modules = getBundleModules(bundleStats);
const assets = _.transform(bundleStats.assets, (result, statAsset) => {
  const asset = result[statAsset.name] = _.pick(statAsset, 'size');

  if (bundlesSources && _.has(bundlesSources, statAsset.name)) {
    asset.parsedSize = bundlesSources[statAsset.name].length;

+ 7 other calls in file

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