Return the data type of a provided ndarray.
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> Return the [data type][@stdlib/ndarray/dtypes] of a provided [ndarray][@stdlib/ndarray/ctor].
``bash`
npm install @stdlib/ndarray-dtype
`javascript`
var dtype = require( '@stdlib/ndarray-dtype' );
#### dtype( x )
Returns the [data type][@stdlib/ndarray/dtypes] of a provided [ndarray][@stdlib/ndarray/ctor].
`javascript
var zeros = require( '@stdlib/ndarray-zeros' );
var x = zeros( [ 3, 2, 3 ], {
'dtype': 'float64'
});
// returns
var dt = dtype( x );
// returns 'float64'
`
`javascript
var zeros = require( '@stdlib/ndarray-zeros' );
var slice = require( '@stdlib/ndarray-slice' );
var E = require( '@stdlib/slice-multi' );
var S = require( '@stdlib/slice-ctor' );
var dtype = require( '@stdlib/ndarray-dtype' );
// Create an array:
var x = zeros( [ 10, 10, 10, 10 ] );
// returns
// Define some slices:
var slices = [
// :,:,:,:
E( null, null, null, null ),
// 5:10,4,2:4,::-1
E( S( 5, 10 ), 4, S( 2, 4 ), S( null, null, -1 ) ),
// :,:,2,:
E( null, null, 2, null ),
// 1,2,3,:
E( 1, 2, 3, null ),
// 1,3,::2,4::2
E( 1, 3, S( null, null, 2 ), S( 4, null, 2 ) )
];
// Determine the data type for each slice...
var s;
var i;
for ( i = 0; i < slices.length; i++ ) {
s = slice( x, slices[ i ] );
console.log( '%s => %s', dtype( x ), dtype( s ) );
}
`
*
- [@stdlib/ndarray-array][@stdlib/ndarray/array]: multidimensional arrays.
- [@stdlib/ndarray-ctor][@stdlib/ndarray/ctor]: multidimensional array constructor.
- [@stdlib/ndarray-dtypes][@stdlib/ndarray/dtypes]: list of ndarray data types.
*
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].
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---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/ndarray-dtype/tree/deno
[deno-readme]: https://github.com/stdlib-js/ndarray-dtype/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/ndarray-dtype/tree/umd
[umd-readme]: https://github.com/stdlib-js/ndarray-dtype/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/ndarray-dtype/tree/esm
[esm-readme]: https://github.com/stdlib-js/ndarray-dtype/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/ndarray-dtype/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/ndarray-dtype/main/LICENSE
[@stdlib/ndarray/ctor]: https://www.npmjs.com/package/@stdlib/ndarray-ctor
[@stdlib/ndarray/dtypes]: https://www.npmjs.com/package/@stdlib/ndarray-dtypes
[@stdlib/ndarray/array]: https://www.npmjs.com/package/@stdlib/ndarray-array