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# Index Modes

> List of ndarray index modes.

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## Usage

```javascript
var modes = require( '@stdlib/ndarray/index-modes' );
```

#### modes()

Returns a list of ndarray index modes.

```javascript
var out = modes();
// returns [ 'throw', 'normalize', 'clamp', 'wrap' ]
```

The output array contains the following modes:

-   **throw**: specifies that a function should throw an error when an index is outside a restricted interval.
-   **normalize**: specifies that a function should normalize negative indices and throw an error when an index is outside a restricted interval.
-   **wrap**: specifies that a function should wrap around an index using modulo arithmetic.
-   **clamp**: specifies that a function should set an index less than `0` to `0` (minimum index) and set an index greater than a maximum index value to the maximum possible index.

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## Examples

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

```javascript
var indexOf = require( '@stdlib/utils/index-of' );
var modes = require( '@stdlib/ndarray/index-modes' );

var MODES = modes();

function isMode( str ) {
    if ( indexOf( MODES, str ) === -1 ) {
        return false;
    }
    return true;
}

var bool = isMode( 'throw' );
// returns true

bool = isMode( 'normalize' );
// returns true

bool = isMode( 'clamp' );
// returns true

bool = isMode( 'wrap' );
// returns true

bool = isMode( 'beep' );
// returns false
```

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* * *

## See Also

-   <span class="package-name">[`@stdlib/ndarray/array`][@stdlib/ndarray/array]</span><span class="delimiter">: </span><span class="description">multidimensional arrays.</span>
-   <span class="package-name">[`@stdlib/ndarray/ctor`][@stdlib/ndarray/ctor]</span><span class="delimiter">: </span><span class="description">multidimensional array constructor.</span>

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[@stdlib/ndarray/array]: https://github.com/stdlib-js/ndarray/tree/main/array

[@stdlib/ndarray/ctor]: https://github.com/stdlib-js/ndarray/tree/main/ctor

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