# isSquareMatrix
> Test if a value is a 2-dimensional [ndarray][@stdlib/ndarray/ctor]-like object having equal dimensions.
## Usage
```javascript
var isSquareMatrix = require( '@stdlib/assert/is-square-matrix' );
```
#### isSquareMatrix( value )
Tests if a value is a 2-dimensional [ndarray][@stdlib/ndarray/ctor]-like object having equal dimensions.
```javascript
var ndarray = require( '@stdlib/ndarray/ctor' );
var arr = ndarray( 'generic', [ 0, 0, 0, 0 ], [ 2, 2 ], [ 2, 1 ], 0, 'row-major' );
var bool = isSquareMatrix( arr );
// returns true
```
## Examples
```javascript
var ndarray = require( '@stdlib/ndarray/ctor' );
var isSquareMatrix = require( '@stdlib/assert/is-square-matrix' );
var arr = ndarray( 'generic', [ 0, 0, 0, 0 ], [ 2, 2 ], [ 2, 1 ], 0, 'row-major' );
var out = isSquareMatrix( arr );
// returns true
out = isSquareMatrix( [ 1, 2, 3, 4 ] );
// returns false
out = isSquareMatrix( {} );
// returns false
out = isSquareMatrix( null );
// returns false
```
[@stdlib/ndarray/ctor]: https://www.npmjs.com/package/@stdlib/ndarray-ctor