Create an uninitialized array having a specified length.
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> Create an uninitialized array having a specified length.
``bash`
npm install @stdlib/array-empty
`javascript`
var empty = require( '@stdlib/array-empty' );
#### empty( length\[, dtype] )
Creates an uninitialized array having a specified length.
`javascript`
var arr = empty( 2 );
// returns
By default, the output array [data type][@stdlib/array/dtypes] is float64 (i.e., a [typed array][mdn-typed-array]). To specify an alternative [data type][@stdlib/array/dtypes], provide a dtype argument.
`javascript`
var arr = empty( 2, 'int32' );
// returns
- In browser environments, the function always returns zero-filled arrays.
- If dtype is 'generic', the function always returns a zero-filled array.>=3.0.0
- In Node.js versions , the underlying memory of returned typed arrays is not initialized. Memory contents are unknown and may contain sensitive data.
`javascript
var dtypes = require( '@stdlib/array-dtypes' );
var empty = require( '@stdlib/array-empty' );
// Get a list of array data types:
var dt = dtypes();
// Generate empty arrays...
var arr;
var i;
for ( i = 0; i < dt.length; i++ ) {
arr = empty( 4, dt[ i ] );
console.log( arr );
}
`
*
- [@stdlib/array-empty-like][@stdlib/array/empty-like]: create an uninitialized array having the same length and data type as a provided array.
- [@stdlib/array-full][@stdlib/array/full]: create a filled array having a specified length.
- [@stdlib/array-ones][@stdlib/array/ones]: create an array filled with ones and having a specified length.
- [@stdlib/array-zeros][@stdlib/array/zeros]: create a zero-filled array having a specified length.
- [@stdlib/ndarray-empty][@stdlib/ndarray/empty]: create an uninitialized ndarray having a specified shape and data type.
*
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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[stdlib]: https://github.com/stdlib-js/stdlib
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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/array-empty/tree/deno
[deno-readme]: https://github.com/stdlib-js/array-empty/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/array-empty/tree/umd
[umd-readme]: https://github.com/stdlib-js/array-empty/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/array-empty/tree/esm
[esm-readme]: https://github.com/stdlib-js/array-empty/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/array-empty/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/array-empty/main/LICENSE
[mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray
[@stdlib/array/dtypes]: https://www.npmjs.com/package/@stdlib/array-dtypes
[@stdlib/array/empty-like]: https://www.npmjs.com/package/@stdlib/array-empty-like
[@stdlib/array/full]: https://www.npmjs.com/package/@stdlib/array-full
[@stdlib/array/ones]: https://www.npmjs.com/package/@stdlib/array-ones
[@stdlib/array/zeros]: https://www.npmjs.com/package/@stdlib/array-zeros
[@stdlib/ndarray/empty]: https://www.npmjs.com/package/@stdlib/ndarray-empty