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

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# noneInBy

[![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 every 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/utils-none-in-by
```

</section>

<section class="usage">

## Usage

```javascript
var noneInBy = require( '@stdlib/utils-none-in-by' );
```

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

Tests whether every 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 = noneInBy( 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 = noneInBy( obj, isUnderage );
// returns false
```

The invoked `function` is provided three agruments:

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

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

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

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

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

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

var mean = context.sum / context.count;
// returns 2.5
```

</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

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

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

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

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

    <!-- eslint-disable no-sparse-arrays, stdlib/doctest-marker -->

    ```javascript
    function log( value, index ) {
        console.log( '%s: %s', index, value );
        return false;
    }

    var obj = {
        'a': 1,
        'b': NaN,
        'c': NaN,
        'd': 4
    };

    var bool = noneInBy( arr, log );
    /* =>
        0: 1
        1: undefined
        2: undefined
        3: 4
    */
    ```

</section>

<!-- /.notes -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

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

```javascript
var noneInBy = require( '@stdlib/utils-none-in-by' );

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

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

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

</section>

<!-- /.examples -->

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<section class="references">

</section>

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<section class="related">

* * *

## See Also

</section>

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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; 2016-2024. The Stdlib [Authors][stdlib-authors].

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