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How to use the mergeWith function from lodash

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

lodash.mergeWith is a function that merges two or more objects or arrays recursively, and allows the customization of the merging process with a customizer function.

lodash-contrib.commonjs.js

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module.exports.maxBy               = _.maxBy;
module.exports.mean                = _.mean;
module.exports.meanBy              = _.meanBy;
module.exports.memoize             = _.memoize;
module.exports.merge               = _.merge;
module.exports.mergeWith           = _.mergeWith;
module.exports.method              = _.method;
module.exports.methodOf            = _.methodOf;
module.exports.methodize           = _.methodize;
module.exports.min                 = _.min;

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+ 92 other calls in file

rts.js

GitHub: lando/cli

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/*
 * Uses _.mergeWith to concat arrays, this helps replicate how Docker Compose
 * merges its things
 *
 */
exports.merge = (old, ...fresh) => _.mergeWith(old, ...fresh, (s, f) => {
  if (_.isArray(s)) return _.uniq(s.concat(f));
});


/*

+ 5 other calls in file

How does lodash.mergeWith work?

lodash.mergeWith is a function that merges two or more objects deeply into one object with custom function as a resolver to determine how to merge values at each key. The custom function is called with four arguments: the destination value, the source value, the key, and the merged object.

webpack.config.js

GitHub: cloudscape-design/demos

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        ignoreOrder: true,
        filename: '[name].css',
      }),
    ],
  };
  return mergeWith(defaults, config, mergeArrays);
};


module.exports = configs.map((config, index) => createWebpackConfig(config, { includeDevServer: index === 1 }));

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(mapValues); // => { 'a': 'a1', 'b': 'b2' }


const merge = _.merge({ 'a': [{ 'b': 1 }, { 'd': 2 }] }, { 'a': [{ 'c': 3 }, { 'e': 4 }] });
console.log(merge); // => { 'a': [{ 'b': 1, 'c': 3 }, { 'd': 2, 'e': 4 }] }


const mergeWith = _.mergeWith({ 'a': [{ 'b': 1 }, { 'd': 2 }] }, { 'a': [{ 'c': 3 }, { 'e': 4 }] }, (a, b) => a + b);
console.log(mergeWith); // => { 'a': [{ 'b': 1, 'c': 3 }, { 'd': 2, 'e': 4 }] }


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

+ 15 other calls in file

Ai Example

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const _ = require("lodash");

const customizer = (objValue, srcValue) => {
  if (_.isArray(objValue)) {
    return objValue.concat(srcValue);
  }
};

const objA = { a: [1], b: [2], c: { x: 3 } };
const objB = { a: [4], b: [5], c: { y: 6 } };

const merged = _.mergeWith(objA, objB, customizer);

console.log(merged);
// Output: { a: [1, 4], b: [2, 5], c: { x: 3, y: 6 } }

In this example, we're merging two objects objA and objB into a new object called merged using lodash.mergeWith. We're also passing in a custom customizer function that specifies how to merge array values. The customizer function is called for each value being merged. If the value is an array, it will concatenate the source array (srcValue) onto the original array (objValue). If it's not an array, the value from the source object (srcValue) will overwrite the value in the original object (objValue). The resulting merged object has the same structure as the original objects, with arrays concatenated and values from objB overwriting values from objA.

util.js

GitHub: electrode-io/electrode

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  const {
    chunksById: { js, css }
  } = assets;

  const bundleBase = utils.getBundleBase(routeOptions);
  const allChunks = _.mergeWith({}, js, css, (a, b) => (a && b ? [].concat(a, b) : a || b));
  CDN_JS_BUNDLES = utils.mapCdnAssets(allChunks, bundleBase, CDN_ASSETS);

  return CDN_JS_BUNDLES;
},

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generic.js

GitHub: polymorpher/ens-registrar-relay

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const ds = require('./datastore').client()
const appConfig = require('../../config')
const _ = require('lodash')


const mergeNonEmpty = (a, b) => {
  return _.mergeWith(a, b, (original, newValue) => {
    if (_.isUndefined(newValue) || _.isNull(newValue) || _.isNaN(newValue)) {
      return original
    }
    return undefined

+ 10 other calls in file

main.js

GitHub: happypandax/happypandax

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    res.statusCode = 500;
    res.end('Internal Momo Error (×﹏×)');
  }
});


const config = _.mergeWith(
  {},
  defaultConfig,
  nextConfigs(undefined, { defaultConfig: {} }),
  (objValue, srcValue) => {

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+ 33 other calls in file

user.controller.js

GitHub: appveen/ds-user-management

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.then(_document => {
	if (!_document) {
		return res.status(404).send();
	}
	oldValues = _document.toObject();
	updated = _.mergeWith(_document, body, customizer);
	if (body.attributes)
		updated.attributes = body.attributes;
	if (_.isEqual(JSON.parse(JSON.stringify(updated)), JSON.parse(JSON.stringify(oldValues)))) return;
	updated = new crudder.model(updated);

determine-action.test.js

GitHub: inkafrog/binance-trading-bot

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  }
].forEach(t => {
  describe(`${t.name}`, () => {
    let testRawData;
    beforeEach(async () => {
      testRawData = _.mergeWith(rawData, t.rawData);

      step = require('../determine-action');

      result = await step.execute(loggerMock, testRawData);

+ 8 other calls in file

build.js

GitHub: bosens-China/new-house

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    }),
  ],
  stats: mode === 'development' ? 'minimal' : undefined,
};

return _.mergeWith(config, newConfig, (objValue, srcValue) => {
  if (_.isArray(objValue)) {
    return objValue.concat(srcValue);
  }
});

+ 2 other calls in file

strapi-server.js

GitHub: Amber-Creative/strapi-admin

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};


if (strapi.EE) {
  const eeAdmin = require('./ee/strapi-server');


  module.exports = _.mergeWith({}, admin, eeAdmin, mergeRoutes);
} else {
  module.exports = admin;
}

+ 17 other calls in file

config.js

GitHub: SumeetOutlook/sumeet-practice

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  this.crossOriginAttribute = true
  this.browserSocketTimeout = 20000
}

set (newConfig) {
  _.mergeWith(this, newConfig, (obj, src) => {
    // Overwrite arrays to keep consistent with #283
    if (Array.isArray(src)) {
      return src
    }

+ 3 other calls in file

manifest.js

GitHub: danielgreendev/metamask-extension-develop

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    'app',
    process.env.ENABLE_MV3 ? 'manifest/v3' : 'manifest/v2',
    `${platform}.json`,
  ),
);
const result = mergeWith(
  cloneDeep(baseManifest),
  platformModifications,
  browserVersionMap[platform],
  await getBuildModifications(buildType, platform),

+ 2 other calls in file

index.cjs.js

GitHub: lianhr12/vite-plugin-ossplus

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this.config = defaultConfig; // 配置参数
this.client = {}; // 阿里云OSS客户端
this.finalPrefix = ''; // 最终计算出来的prefix路径
this.currentProvider = {}; // 当前提供服务商信息
// 合并配置信息
this.config = lodash.mergeWith(lodash.cloneDeep(this.config), config || {}, function (objVal, srcVal) {
    if (lodash.isPlainObject(objVal) && lodash.isPlainObject(srcVal)) {
        return lodash.merge(objVal, srcVal);
    }
    return srcVal;

+ 3 other calls in file

get_startup_css.js

GitHub: open-beagle/gitlab-foss

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  return $.html();
};


const mergePurgeCSSOptions = (...options) =>
  mergeWith(...options, (objValue, srcValue) => {
    if (isArray(objValue)) {
      return objValue.concat(srcValue);
    }

+ 3 other calls in file

core-api.js

GitHub: mariaborjaarteaga/constructorAPI

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/**
 * Add a graphql schema to the plugin's global graphl schema to be processed
 * @param {object} schema
 */
const addGraphqlSchema = (schema) => {
  _.mergeWith(strapi.config.get('plugin.i18n.schema.graphql'), schema, mergeCustomizer);
};


/**
 * Add localization mutation & filters to use with the graphql plugin

load-admin.js

GitHub: Codesee-io/strapi

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      loadFiles(eeAdminPath, '!(config|test)/*.*(js|json)'),
      loadConfig(eeAdminPath),
    ]);
  }

  return _.mergeWith({}, files, eeFiles, config, eeConfig, mergeRoutes);
};

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