npm package: @stdlib/utils-any-in-by
Description: Test whether at least one property in an object passes a test implemented by a predicate function.
Author: The Stdlib Authors
Latest version: 0.1.1

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# anyInBy

[![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 at least one property in an object passes 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/utils-any-in-by
```

</section>

<section class="usage">

## Usage

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

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

Tests whether at least one property in an `object` passes a test implemented by a `predicate` function.

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

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

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

If a `predicate` function returns a truthy value, 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
};

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

The invoked `function` is provided three arguments:

-   `value`: property value
-   `key`: property key
-   `object`: 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': -4
};

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

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

var mean = context.sum / context.count;
// returns 0.5
```

</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

-   The `obj` object may contain own properties as well as inherited properties from its prototype chain.

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

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

</section>

<!-- /.notes -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

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

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

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

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

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

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

</section>

<!-- /.examples -->

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</section>

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<section class="related">

<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].

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