assignIn

Copy enumerable own and inherited properties from one or more source objects to a target object.

Installation

npm install @stdlib/object-assign-in

Usage

var assignIn = require( '@stdlib/object-assign-in' );

assignIn( target, source1[, source2[,...,sourceN]] )

Copies enumerable own and inherited properties from one or more source objects to a target object.

function Foo() {
    this.a = 'beep';
    return this;
}

Foo.prototype.b = 'boop';

var x = {};
var y = new Foo();

var z = assignIn( x, y );
// returns { 'a': 'beep', 'b': 'boop' }

var bool = ( z === x );
// returns true

Notes

• If a property key is present in multiple sources, the property from the last source that defines the key prevails.
• The target object is mutated.
• Both string and symbol properties are copied.

Examples

var assignIn = require( '@stdlib/object-assign-in' );

function Foo() {
    this.a = 1;
    return this;
}

Foo.prototype.b = 2;

function Bar() {
    this.c = 3;
    return this;
}

Bar.prototype.d = 4;

var obj1 = new Foo();
var obj2 = new Bar();

var result = assignIn( {}, obj1, obj2 );
// returns { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }

Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

Community

License

See LICENSE.

Copyright

Copyright © 2016-2026. The Stdlib Authors.