npm package: @stdlib/array-from-scalar
Description: Create a single-element array containing a provided scalar value.
Author: The Stdlib Authors
Latest version: 0.3.1

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# scalar2array

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> Create a single-element array containing a provided scalar value.

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<section class="intro">

</section>

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<section class="installation">

## Installation

```bash
npm install @stdlib/array-from-scalar
```

</section>

<section class="usage">

## Usage

```javascript
var scalar2array = require( '@stdlib/array-from-scalar' );
```

#### scalar2array( value\[, dtype] )

Returns a single-element array containing a provided scalar value.

```javascript
var x = scalar2array( 3.0 );
// returns <Float64Array>[ 3.0 ]
```

If not provided a `dtype` argument and `value`

-   is a number, the default [data type][@stdlib/array/dtypes] is the [default][@stdlib/array/defaults] real-valued floating-point data type.
-   is a boolean, the default [data type][@stdlib/array/dtypes] is the [default][@stdlib/array/defaults] boolean data type.
-   is a complex number object of a known data type, the data type is the same as the provided value.
-   is a complex number object of an unknown data type, the default [data type][@stdlib/array/dtypes] is the [default][@stdlib/array/defaults] complex-valued floating-point data type.
-   is any other value type, the default [data type][@stdlib/array/dtypes] is `'generic'`.

To explicitly specify the [data type][@stdlib/array/dtypes] of the returned array, provide a `dtype` argument.

```javascript
var x = scalar2array( 3.0, 'float32' );
// returns <Float32Array>[ 3.0 ]
```

</section>

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<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

## Notes

-   If `value` is a number and the `dtype` argument is a complex [data type][@stdlib/array/dtypes], the function returns a complex number array containing a complex number whose real component equals the provided scalar `value` and whose imaginary component is zero.
-   The function does **not** guard against precision loss when `value` is a number and the `dtype` argument is an integer [data type][@stdlib/array/dtypes].

</section>

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<!-- Package usage examples. -->

<section class="examples">

## Examples

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

```javascript
var Complex128 = require( '@stdlib/complex-float64-ctor' );
var array2scalar = require( '@stdlib/array-from-scalar' );

var x = array2scalar( 3.0 );
// returns <Float64Array>[ 3.0 ]

x = array2scalar( 3, 'int32' );
// returns <Int32Array>[ 3 ]

x = array2scalar( new Complex128( 3.0, 4.0 ) );
// returns <Complex128Array>

x = array2scalar( {} );
// returns [ {} ]
```

</section>

<!-- /.examples -->

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* * *

## See Also

-   <span class="package-name">[`@stdlib/array-from-iterator`][@stdlib/array/from-iterator]</span><span class="delimiter">: </span><span class="description">create (or fill) an array from an iterator.</span>

</section>

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* * *

## Notice

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].

#### Community

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---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

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[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/array-from-scalar/main/LICENSE

[@stdlib/array/dtypes]: https://www.npmjs.com/package/@stdlib/array-dtypes

[@stdlib/array/defaults]: https://www.npmjs.com/package/@stdlib/array-defaults

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[@stdlib/array/from-iterator]: https://www.npmjs.com/package/@stdlib/array-from-iterator

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