@stdlib/utils/none-in-by/README.md

Standard utilities.

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# noneInBy

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

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## 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
```

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## 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
    */
    ```

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## 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>

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* * *

## See Also

</section>

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