npm package: @stdlib/utils-some-in-by
Description: Test whether an object contains at least n properties (own and inherited) which pass a test implemented by a predicate function.
Author: The Stdlib Authors
Latest version: 0.1.1

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  <summary>
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# someInBy

[![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 an object contains at least `n` properties which pass a test implemented by a predicate function.

<section class="intro">

</section>

<!-- /.intro -->

<section class="installation">

## Installation

```bash
npm install @stdlib/utils-some-in-by
```

</section>

<section class="usage">

## Usage

```javascript
var someInBy = require( '@stdlib/utils-some-in-by' );
```

#### someInBy( obj, n, predicate\[, thisArg ] )

Tests whether an `obj` contains at least `n` properties which pass a test implemented by a `predicate` function.

```javascript
function isNegative( value ) {
    return ( value < 0 );
}

var obj = {
    'a': 1,
    'b': -2,
    'c': 3,
    'd': -1
};

var bool = someInBy( obj, 2, isNegative );
// returns true
```

Once the function finds `n` successful properties, the function **immediately** returns `true`.

```javascript
function isPositive( value ) {
    if ( value < 0 ) {
        throw new Error( 'should never reach this line' );
    }
    return ( value > 0 );
}

var obj = {
    'a': 1,
    'b': 2,
    'c': -3,
    'd': 4
};

var bool = someInBy( obj, 2, isPositive );
// returns true
```

The invoked `function` is provided three arguments:

-   `value`: object property value
-   `key`: object property key
-   `obj`: input object

To set the function execution context, provide a `thisArg`.

```javascript
function sum( value ) {
    this.sum += value;
    this.count += 1;
    return ( value < 0 );
}

var obj = {
    'a': 1,
    'b': 2,
    'c': 3,
    'd': -5
};

var context = {
    'sum': 0,
    'count': 0
};

var bool = someInBy( obj, 1, sum, context );
// returns true

var mean = context.sum / context.count;
// returns 0.25
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   If provided an empty `obj`, the function returns `false`.

    ```javascript
    function alwaysTrue() {
        return true;
    }
    var bool = someInBy( {}, 1, alwaysTrue );
    // returns false
    ```

-   The function does **not** skip `undefined` properties.

    ```javascript
    function log( value, key ) {
        console.log( '%s: %s', key, value );
        return ( value < 0 );
    }

    var obj = {
        'a': 1,
        'b': void 0,
        'c': void 0,
        'd': 4,
        'e': -1
    };

    var bool = someInBy( obj, 1, log );
    // logs
    // a: 1
    // b: void 0
    // c: void 0
    // d: 4
    // e: -1
    ```

-   The function provides limited support for dynamic objects (i.e., objects whose properties change during execution).

</section>

<!-- /.notes -->

<section class="examples">

## Examples

```javascript
var randu = require( '@stdlib/random-base-randu' );
var someInBy = require( '@stdlib/utils-some-in-by' );

function threshold( value ) {
    return ( value > 0.95 );
}

var bool;
var obj = {};
var i;

for ( i = 0; i < 100; i++ ) {
    obj[ 'key' + i ] = randu();
}

bool = someInBy( obj, 5, threshold );
// returns <boolean>
```

</section>

<!-- /.examples -->

<section class="references">

</section>

<!-- /.references -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/utils-any-by`][@stdlib/utils/any-by]</span><span class="delimiter">: </span><span class="description">test whether at least one element in a collection passes a test implemented by a predicate function.</span>
-   <span class="package-name">[`@stdlib/utils-every-by`][@stdlib/utils/every-by]</span><span class="delimiter">: </span><span class="description">test whether all elements in a collection 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/utils-async/some-by`][@stdlib/utils/async/some-by]</span><span class="delimiter">: </span><span class="description">test whether a collection contains `n` elements which pass a test implemented by a predicate function.</span>
-   <span class="package-name">[`@stdlib/utils-some-by-right`][@stdlib/utils/some-by-right]</span><span class="delimiter">: </span><span class="description">test whether a collection contains at least `n` elements which pass a test implemented by a predicate function, iterating from right to left.</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; 2016-2024. The Stdlib [Authors][stdlib-authors].

</section>

<!-- /.stdlib -->

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[umd]: https://github.com/umdjs/umd
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[deno-url]: https://github.com/stdlib-js/utils-some-in-by/tree/deno
[deno-readme]: https://github.com/stdlib-js/utils-some-in-by/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/utils-some-in-by/tree/umd
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[esm-url]: https://github.com/stdlib-js/utils-some-in-by/tree/esm
[esm-readme]: https://github.com/stdlib-js/utils-some-in-by/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/utils-some-in-by/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/utils-some-in-by/main/LICENSE
<!-- <related-links> -->

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

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

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

[@stdlib/utils/async/some-by]: https://www.npmjs.com/package/@stdlib/utils-async-some-by

[@stdlib/utils/some-by-right]: https://www.npmjs.com/package/@stdlib/utils-some-by-right

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

</section>

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