time-to-botec/js/node_modules/@stdlib/utils/none-by-right/README.md

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# noneByRight

> Test whether all elements in a collection fail a test implemented by a predicate function, iterating from right to left.

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<section class="usage">

## Usage

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

#### noneByRight( collection, predicate\[, thisArg ] )

Tests whether all elements in a `collection` fail a test implemented by a `predicate` function, iterating from right to left.

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

var arr = [ -1, -2, -3, -4 ];

var bool = noneByRight( arr, isPositive );
// returns true
```

If a `predicate` function returns a truthy value, the function **immediately** returns `false`.

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

var arr = [ -1, 2, -3, -4 ];

var bool = noneByRight( arr, isPositive );
// returns false
```

The invoked `function` is provided three arguments:

-   `value`: collection element
-   `index`: collection index
-   `collection`: input collection

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 arr = [ 1, 2, 3, 4 ];

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

var bool = noneByRight( arr, sum, context );
// returns true

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

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## Notes

-   A `collection` may be either an [`Array`][mdn-array], [`Typed Array`][mdn-typed-array], or an array-like [`Object`][mdn-object] (excluding `strings` and `functions`).

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

    ```javascript
    function truthy() {
        return true;
    }
    var bool = noneByRight( [], 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 arr = [ 1, , , 4 ];

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

-   The function provides limited support for dynamic collections (i.e., collections whose `length` changes during execution). Note, however, that index incrementation is **not** guaranteed to be monotonically **decreasing**.

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## Examples

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

```javascript
var randu = require( '@stdlib/random/base/randu' );
var noneByRight = require( '@stdlib/utils/none-by-right' );

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

var bool;
var arr;
var i;

arr = new Array( 100 );
for ( i = 0; i < arr.length; i++ ) {
    arr[ i ] = -randu();
}

bool = noneByRight( arr, isPositive );
// returns true
```

</section>

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[mdn-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array

[mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray

[mdn-object]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object

</section>

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