npm package: @stdlib/object-none-own-by
Description: Tests whether every own property of an object fails a test implemented by a predicate function.
Author: The Stdlib Authors
Latest version: 0.1.1

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  <summary>
    About stdlib...
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# noneOwnBy

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> Tests whether every own property of an object fails a test implemented by a predicate function.

<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->

<section class="intro">

</section>

<!-- /.intro -->

<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/object-none-own-by
```

</section>

<section class="usage">

## Usage

```javascript
var noneOwnBy = require( '@stdlib/object-none-own-by' );
```

#### noneOwnBy( object, predicate\[, thisArg ] )

Tests whether every `own` property of an object fails a test implemented by a `predicate` function.

```javascript
function isUnderage( age ) {
    return ( age < 18 );
}

var obj = {
    'a': 28,
    'b': 22,
    'c': 25
};

var bool = noneOwnBy( obj, isUnderage );
// returns true
```

If a `predicate` function returns a truthy value, the function **immediately** returns `false`.

```javascript
function isUnderage( age ) {
    return ( age < 18 );
}

var obj = {
    'a': 12,
    'b': 22,
    'c': 25
};

var bool = noneOwnBy( obj, isUnderage );
// returns false
```

</section>

<!-- /.usage -->

<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

## Notes

-   If the 1st argument is not an object or the second argument is not a function, the function throws a Type Error.

-   If provided an empty object, the function returns `true`.

    ```javascript
    function truthy() {
        return true;
    }
    var bool = noneOwnBy( {}, truthy );
    // returns true
    ```

</section>

<!-- /.notes -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var noneOwnBy = require( '@stdlib/object-none-own-by' );

function isUnderage( age ) {
    return age < 18;
}

var obj = {
    'a': 26,
    'b': 20,
    'c': 25
};

var bool = noneOwnBy( obj, isUnderage );
// returns true
```

</section>

<!-- /.examples -->

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<section class="references">

</section>

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<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/object-any-own-by`][@stdlib/object/any-own-by]</span><span class="delimiter">: </span><span class="description">test whether whether any 'own' property of a provided object satisfies a predicate function.</span>
-   <span class="package-name">[`@stdlib/object-every-own-by`][@stdlib/object/every-own-by]</span><span class="delimiter">: </span><span class="description">test whether all own properties of an object pass a test implemented by a predicate function.</span>
-   <span class="package-name">[`@stdlib/utils-none-by`][@stdlib/utils/none-by]</span><span class="delimiter">: </span><span class="description">test whether all elements in a collection fail a test implemented by a predicate function.</span>
-   <span class="package-name">[`@stdlib/object-some-own-by`][@stdlib/object/some-own-by]</span><span class="delimiter">: </span><span class="description">test whether some `own` properties of a provided object satisfy a predicate function for at least `n` properties.</span>

</section>

<!-- /.related -->

<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->


<section class="main-repo" >

* * *

## Notice

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].

#### Community

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

</section>

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[npm-url]: https://npmjs.org/package/@stdlib/object-none-own-by

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[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/object-none-own-by/main.svg
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[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/object-none-own-by/tree/deno
[deno-readme]: https://github.com/stdlib-js/object-none-own-by/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/object-none-own-by/tree/umd
[umd-readme]: https://github.com/stdlib-js/object-none-own-by/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/object-none-own-by/tree/esm
[esm-readme]: https://github.com/stdlib-js/object-none-own-by/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/object-none-own-by/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/object-none-own-by/main/LICENSE

<!-- <related-links> -->

[@stdlib/object/any-own-by]: https://www.npmjs.com/package/@stdlib/object-any-own-by

[@stdlib/object/every-own-by]: https://www.npmjs.com/package/@stdlib/object-every-own-by

[@stdlib/utils/none-by]: https://www.npmjs.com/package/@stdlib/utils-none-by

[@stdlib/object/some-own-by]: https://www.npmjs.com/package/@stdlib/object-some-own-by

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</section>

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