npm package: @stdlib/object-every-in-by
Description: Test whether all properties (own and inherited) of an object pass a test implemented by a predicate function.
Author: The Stdlib Authors
Latest version: 0.1.1

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<details>
  <summary>
    About stdlib...
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  <p>We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.</p>
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</details>

# everyInBy

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

> Test whether all properties (own and inherited) of an object pass a test implemented by a predicate function.

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<section class="intro">

</section>

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<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/object-every-in-by
```

</section>

<section class="usage">

## Usage

```javascript
var everyInBy = require( '@stdlib/object-every-in-by' );
```

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

Tests whether all properties (own and inherited) of an `object` pass a test implemented by a `predicate` function.

```javascript
var o;
var bool;

function isPositive( v ) {
    return ( v > 0 );
}

o = {
    'a': 1,
    'b': 2,
    'c': 3
};

bool = everyInBy( o, isPositive );
// returns true
```

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

```javascript
function isPositive( v ) {
    return ( v > 0 );
}

var bool = everyInBy( {}, isPositive );
// returns true
```

</section>

<!-- /.usage -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

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

```javascript
var randu = require( '@stdlib/random-base-randu' );
var everyInBy = require( '@stdlib/object-every-in-by' );

var bool;
var o;
var i;

function isPositive( v ) {
    return ( v > 0 );
}

o = {};
for ( i = 0; i < 100; i++ ) {
    o[ i ] = ( randu() < 0.95 );
}

bool = everyInBy( o, isPositive );
// returns <boolean>
```

</section>

<!-- /.examples -->

<!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="references">

</section>

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<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/object-any-in-by`][@stdlib/object/any-in-by]</span><span class="delimiter">: </span><span class="description">test whether at least one property in an object passes a test implemented by a predicate function.</span>
-   <span class="package-name">[`@stdlib/object-none-in-by`][@stdlib/object/none-in-by]</span><span class="delimiter">: </span><span class="description">test whether every property in an object fails a test implemented by a predicate function.</span>
-   <span class="package-name">[`@stdlib/object-some-in-by`][@stdlib/object/some-in-by]</span><span class="delimiter">: </span><span class="description">test whether an object contains at least n properties (own and inherited) which pass a test implemented by 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>

</section>

<!-- /.related -->

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<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>

<!-- /.stdlib -->

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<section class="links">

[npm-image]: http://img.shields.io/npm/v/@stdlib/object-every-in-by.svg
[npm-url]: https://npmjs.org/package/@stdlib/object-every-in-by

[test-image]: https://github.com/stdlib-js/object-every-in-by/actions/workflows/test.yml/badge.svg?branch=v0.1.1
[test-url]: https://github.com/stdlib-js/object-every-in-by/actions/workflows/test.yml?query=branch:v0.1.1

[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/object-every-in-by/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/object-every-in-by?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/object-every-in-by/tree/deno
[deno-readme]: https://github.com/stdlib-js/object-every-in-by/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/object-every-in-by/tree/umd
[umd-readme]: https://github.com/stdlib-js/object-every-in-by/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/object-every-in-by/tree/esm
[esm-readme]: https://github.com/stdlib-js/object-every-in-by/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/object-every-in-by/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/object-every-in-by/main/LICENSE

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

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

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

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

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

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

</section>

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