How to use the extendWith function from lodash

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

lodash.extendWith is a tool that allows developers to merge objects in JavaScript, with the ability to customize the merge logic.

lodash-contrib.commonjs.js

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module.exports.every               = _.every;
module.exports.exists              = _.exists;
module.exports.existsAll           = _.existsAll;
module.exports.explode             = _.explode;
module.exports.extend              = _.extend;
module.exports.extendWith          = _.extendWith;
module.exports.falsey              = _.falsey;
module.exports.falseyAll           = _.falseyAll;
module.exports.fill                = _.fill;
module.exports.filter              = _.filter;

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+ 92 other calls in file

lodash.js

GitHub: mdmarufsarker/lodash

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


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


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


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

+ 15 other calls in file

How does lodash.extendWith work?

lodash.extendWith is a utility function provided by the Lodash library that allows developers to merge objects in JavaScript, with the ability to customize the merge logic. To use lodash.extendWith, developers first import the function from the Lodash library. They can then call the function with one or more objects to be merged, followed by a customizer function that specifies how to handle conflicts between properties. The customizer function takes up to six arguments: objValue (any): The value from the destination object. srcValue (any): The value from the source object. key (string): The key of the property being merged. object (Object): The destination object. source (Object): The source object. stack (Array): An array of previously merged objects to detect circular references. The customizer function should return the value to be assigned to the property. If it returns undefined, the default merging behavior is used. By default, lodash.extendWith performs a shallow merge of the objects, meaning that it only merges properties that exist on the top level of the objects. However, the customizer function can be used to specify a more complex merge behavior, such as merging nested properties. Overall, lodash.extendWith provides a flexible and customizable way to merge objects in JavaScript, making it a valuable tool for web developers who need to combine data from multiple sources.

Ai Example

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const _ = require("lodash");

const object1 = {
  a: 1,
  b: {
    c: 2,
  },
};

const object2 = {
  b: {
    d: 3,
  },
  e: 4,
};

const customizer = (objValue, srcValue, key, object, source) => {
  if (_.isObject(objValue)) {
    return _.extendWith(objValue, srcValue, customizer);
  }
};

const result = _.extendWith(object1, object2, customizer);

console.log(result);

In this example, we first import the Lodash library and define two objects that we want to merge. We then define a customizer function that we will use to specify the merge logic. Our customizer function checks if the property being merged is an object, and if it is, it recursively merges the nested properties using _.extendWith. This allows us to perform a deep merge of the objects, merging the nested properties of the b object. We then call the _.extendWith function with object1, object2, and customizer as arguments. This generates a new object that combines the properties of object1 and object2, with the custom merge logic specified by the customizer function. Finally, we log the resulting merged object to the console using console.log(result). When this code runs, it will print the following merged object to the console: javascript Copy code

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