@types/lodash.merge

What is @types/lodash.merge?

@types/lodash.merge is a TypeScript type definition package for the lodash.merge function, which is part of the Lodash library. Lodash is a popular utility library that provides a wide range of functions for common programming tasks, including object manipulation, array manipulation, and more. The lodash.merge function specifically is used to merge objects, combining their properties recursively.

What are @types/lodash.merge's main functionalities?

Merging Objects

This feature allows you to merge two or more objects recursively. The properties of the source objects are merged into the destination object. If a property at the same key is an object in both source and destination, they are merged recursively.

const _ = require('lodash');
const object1 = { a: 1, b: { c: 2 } };
const object2 = { b: { d: 3 } };
const result = _.merge(object1, object2);
console.log(result); // { a: 1, b: { c: 2, d: 3 } }

Merging Arrays

When merging arrays, lodash.merge will replace the elements of the array in the destination object with the elements of the array in the source object at the same index.

const _ = require('lodash');
const object1 = { a: [1, 2, 3] };
const object2 = { a: [4, 5] };
const result = _.merge(object1, object2);
console.log(result); // { a: [4, 5, 3] }

Merging with Customizer

This feature allows you to provide a customizer function to control how the merge is performed. In this example, the customizer function concatenates arrays instead of replacing them.

const _ = require('lodash');
const object1 = { a: [1, 2, 3] };
const object2 = { a: [4, 5] };
const customizer = (objValue, srcValue) => {
  if (Array.isArray(objValue)) {
    return objValue.concat(srcValue);
  }
};
const result = _.mergeWith(object1, object2, customizer);
console.log(result); // { a: [1, 2, 3, 4, 5] }

Other packages similar to @types/lodash.merge

deepmerge

deepmerge is a library that provides deep merging of JavaScript objects. It is similar to lodash.merge but is a standalone package focused solely on merging objects. It offers a simple API and is often used when only deep merging functionality is needed without the additional utilities provided by Lodash.

merge-deep

merge-deep is another library for deep merging objects. It is lightweight and provides a straightforward API for merging objects recursively. It is similar to lodash.merge but does not come with the additional utilities that Lodash offers.

extend

extend is a library that provides deep and shallow merging of objects. It is similar to lodash.merge but offers both deep and shallow merge options. It is a lightweight alternative for users who need basic merging functionality without the overhead of a larger utility library.

README

Installation

npm install --save @types/lodash.merge

Summary

This package contains type definitions for lodash.merge (http://lodash.com/).

Details

Files were exported from https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/lodash.merge

Additional Details

• Last updated: Mon, 23 Jul 2018 23:44:12 GMT
• Dependencies: lodash
• Global values: none

Credits

These definitions were written by Brian Zengel https://github.com/bczengel, Ilya Mochalov https://github.com/chrootsu, Stepan Mikhaylyuk https://github.com/stepancar.