lodash.assignin

What is lodash.assignin?

The lodash.assignin package is a utility function from the Lodash library that allows you to copy enumerable own and inherited properties from one or more source objects to a target object. This is useful for merging objects and creating new objects with combined properties.

What are lodash.assignin's main functionalities?

Merging Objects

This feature allows you to merge properties from a source object into a target object. In this example, the properties of the source object are added to the target object.

const assignIn = require('lodash.assignin');
const target = { a: 1 };
const source = { b: 2 };
const result = assignIn(target, source);
console.log(result); // { a: 1, b: 2 }

Merging Multiple Objects

This feature allows you to merge properties from multiple source objects into a target object. In this example, properties from both source1 and source2 are added to the target object.

const assignIn = require('lodash.assignin');
const target = { a: 1 };
const source1 = { b: 2 };
const source2 = { c: 3 };
const result = assignIn(target, source1, source2);
console.log(result); // { a: 1, b: 2, c: 3 }

Overwriting Properties

This feature allows you to overwrite existing properties in the target object with properties from the source object. In this example, the property 'b' in the target object is overwritten by the property 'b' from the source object.

const assignIn = require('lodash.assignin');
const target = { a: 1, b: 2 };
const source = { b: 3, c: 4 };
const result = assignIn(target, source);
console.log(result); // { a: 1, b: 3, c: 4 }

Other packages similar to lodash.assignin

object-assign

The object-assign package is a polyfill for the Object.assign method in JavaScript. It provides similar functionality to lodash.assignin by copying enumerable own properties from one or more source objects to a target object. Unlike lodash.assignin, it does not copy inherited properties.

extend

The extend package is a utility for merging objects, similar to lodash.assignin. It allows you to copy properties from one or more source objects to a target object. Unlike lodash.assignin, it provides options for deep merging and handling non-enumerable properties.

merge

The merge package is another utility for merging objects. It provides deep merging capabilities, allowing you to recursively merge properties from source objects into a target object. This is different from lodash.assignin, which performs a shallow merge.

README

lodash.assignin v4.2.0

The lodash method _.assignIn exported as a Node.js module.

Installation

Using npm:

$ {sudo -H} npm i -g npm
$ npm i --save lodash.assignin

In Node.js:

var assignIn = require('lodash.assignin');

See the documentation or package source for more details.