Test for deep equality between two values.
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> Test for deep equality between two values.
``bash`
npm install @stdlib/assert-deep-equal
`javascript`
var deepEqual = require( '@stdlib/assert-deep-equal' );
#### deepEqual( a, b )
Returns a boolean indicating if a is deep equal to b.
`javascript
var bool = deepEqual( [ 1, 2, 3 ], [ 1, 2, 3 ] );
// returns true
bool = deepEqual( [ 1, 2, 3 ], [ 1, 2, '3' ] );
// returns false
bool = deepEqual( { 'a': 2 }, { 'a': [ 2 ] } );
// returns false
`
- The function uses strict equality checks (===) and does not perform any type coercion.
- When given two objects, only enumerable own properties are recursively compared.
`javascript
var deepEqual = require( '@stdlib/assert-deep-equal' );
var a = [ true, false, true ];
var b = [ true, false, true ];
var bool = deepEqual( a, b );
// returns true
b.pop();
bool = deepEqual( a, b );
// returns false
a = { 'a': { 'b': { 'c': 'd' } } };
b = { 'a': { 'b': { 'c': 'd' } } };
bool = deepEqual( a, b );
// returns true
b.a.b.c = null;
bool = deepEqual( a, b );
// returns false
a = { 'a': [ { 'b': 0 }, { 'c': 1 } ] };
b = { 'a': [ { 'b': 0 }, { 'c': 1 } ] };
bool = deepEqual( a, b );
// returns true
b = { 'a': [ { 'b': [ 0 ] }, { 'c': '1' } ] };
bool = deepEqual( a, b );
// returns false
`
*
- [@stdlib/assert-is-strict-equal][@stdlib/assert/is-strict-equal]: test if two arguments are strictly equal.
- [@stdlib/assert-is-same-value][@stdlib/assert/is-same-value]: test if two arguments are the same value.
*
This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].
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---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[npm-url]: https://npmjs.org/package/@stdlib/assert-deep-equal
[test-image]: https://github.com/stdlib-js/assert-deep-equal/actions/workflows/test.yml/badge.svg?branch=v0.2.3
[test-url]: https://github.com/stdlib-js/assert-deep-equal/actions/workflows/test.yml?query=branch:v0.2.3
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[coverage-url]: https://codecov.io/github/stdlib-js/assert-deep-equal?branch=main
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[stdlib]: https://github.com/stdlib-js/stdlib
[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors
[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/assert-deep-equal/tree/deno
[deno-readme]: https://github.com/stdlib-js/assert-deep-equal/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/assert-deep-equal/tree/umd
[umd-readme]: https://github.com/stdlib-js/assert-deep-equal/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/assert-deep-equal/tree/esm
[esm-readme]: https://github.com/stdlib-js/assert-deep-equal/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/assert-deep-equal/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/assert-deep-equal/main/LICENSE
[@stdlib/assert/is-strict-equal]: https://www.npmjs.com/package/@stdlib/assert-is-strict-equal
[@stdlib/assert/is-same-value]: https://www.npmjs.com/package/@stdlib/assert-is-same-value