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The extend npm package is a utility for shallowly or deeply copying the properties of one object to another. It is commonly used to extend the properties of an object with the properties of one or more other objects.
Shallow extend
This feature allows you to copy the properties of one or more source objects to a target object without deep copying. Properties in the target object will be overwritten by properties in the sources if they have the same key.
{"var extend = require('extend');
var obj1 = { a: 1 };
var obj2 = { b: 2 };
var extended = extend(obj1, obj2);
// Result: { a: 1, b: 2 }"}
Deep extend
This feature allows you to perform a deep copy of the properties of one or more source objects into a target object. Nested objects and arrays will be recursively copied, rather than just copying the reference.
{"var extend = require('extend');
var obj1 = { a: { b: 1 } };
var obj2 = { a: { c: 2 } };
var extended = extend(true, obj1, obj2);
// Result: { a: { b: 1, c: 2 } }"}
Lodash's merge function is similar to extend's deep extend feature. It recursively merges own and inherited enumerable string keyed properties of source objects into the destination object, also merging arrays and array-like objects.
Object-assign is a polyfill for the Object.assign() method which copies enumerable and own properties from a source object to a target object. It is similar to extend's shallow copy feature but does not support deep copying.
Deep-extend is an npm package that provides deep copy functionality similar to extend's deep extend feature. It allows for deep copying of the enumerable properties of one or more source objects into a target object.
FAQs
Port of jQuery.extend for node.js and the browser
The npm package extend receives a total of 22,223,822 weekly downloads. As such, extend popularity was classified as popular.
We found that extend demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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