npm package: @stdlib/array-dataview
Description: DataView.
Author: The Stdlib Authors
Latest version: 0.2.3

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<details>
  <summary>
    About stdlib...
  </summary>
  <p>We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.</p>
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</details>

# DataView

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

> [Constructor][mdn-dataview] which returns a data view representing a provided array buffer.

<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->

<section class="intro">

</section>

<!-- /.intro -->

<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/array-dataview
```

</section>

<section class="usage">

## Usage

```javascript
var DataView = require( '@stdlib/array-dataview' );
```

#### DataView( buffer\[, byteOffset\[, byteLength]] )

Returns a [`DataView`][mdn-dataview] representing a provided array buffer.

<!-- eslint-disable stdlib/require-globals -->

```javascript
var ArrayBuffer = require( '@stdlib/array-buffer' );

var buf = new ArrayBuffer( 5 );
// returns <ArrayBuffer>

var dv = new DataView( buf );
// returns <DataView>
```

* * *

### Properties

#### DataView.prototype.buffer

**Read-only** property which returns the underlying array buffer.

<!-- eslint-disable stdlib/require-globals -->

```javascript
var ArrayBuffer = require( '@stdlib/array-buffer' );

var buf1 = new ArrayBuffer( 5 );
var dv = new DataView( buf1 );

var buf2 = dv.buffer;
// returns <ArrayBuffer>

var bool = ( buf1 === buf2 );
// returns true
```

#### DataView.prototype.byteLength

**Read-only** property which returns the length (in bytes) of the [`DataView`][mdn-dataview].

<!-- eslint-disable stdlib/require-globals -->

```javascript
var ArrayBuffer = require( '@stdlib/array-buffer' );

var buf = new ArrayBuffer( 5 );
var dv = new DataView( buf );

var byteLength = dv.byteLength;
// returns 5
```

#### DataView.prototype.byteOffset

**Read-only** property which returns the number of bytes from the [`DataView`][mdn-dataview] to the start of the underlying array buffer.

<!-- eslint-disable stdlib/require-globals -->

```javascript
var ArrayBuffer = require( '@stdlib/array-buffer' );

var buf = new ArrayBuffer( 5 );
var dv = new DataView( buf, 3 );

var byteOffset = dv.byteOffset;
// returns 3
```

* * *

### Methods

TODO: document methods

</section>

<!-- /.usage -->

* * *

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

<section class="notes">

</section>

<!-- /.notes -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

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

```javascript
var IS_LITTLE_ENDIAN = require( '@stdlib/assert-is-little-endian' );
var toBinaryString = require( '@stdlib/number-uint8-base-to-binary-string' );
var randu = require( '@stdlib/random-base-randu' );
var Uint8Array = require( '@stdlib/array-uint8' );
var ArrayBuffer = require( '@stdlib/array-buffer' );
var DataView = require( '@stdlib/array-dataview' );

// Create a new ArrayBuffer:
var buf = new ArrayBuffer( 64 );

// Create a new DataView:
var dv = new DataView( buf );

// Set values in the view:
var i;
for ( i = 0; i < dv.byteLength/8; i++ ) {
    dv.setFloat64( i*8, randu()*100.0, IS_LITTLE_ENDIAN );
}

// Create a "bytes" view of the underlying array buffer:
var bytes = new Uint8Array( dv.buffer );

// Print the bytes:
for ( i = 0; i < bytes.length; i++ ) {
    console.log( 'byte %d: %s', i, toBinaryString( bytes[ i ] ) );
}
```

</section>

<!-- /.examples -->

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<section class="references">

</section>

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<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/array-buffer`][@stdlib/array/buffer]</span><span class="delimiter">: </span><span class="description">ArrayBuffer.</span>
-   <span class="package-name">[`@stdlib/array-typed`][@stdlib/array/typed]</span><span class="delimiter">: </span><span class="description">create a typed array.</span>

</section>

<!-- /.related -->

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<section class="main-repo" >

* * *

## 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

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

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

</section>

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[npm-image]: http://img.shields.io/npm/v/@stdlib/array-dataview.svg
[npm-url]: https://npmjs.org/package/@stdlib/array-dataview

[test-image]: https://github.com/stdlib-js/array-dataview/actions/workflows/test.yml/badge.svg?branch=v0.2.3
[test-url]: https://github.com/stdlib-js/array-dataview/actions/workflows/test.yml?query=branch:v0.2.3

[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/array-dataview/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/array-dataview?branch=main

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[stdlib]: https://github.com/stdlib-js/stdlib

[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors

[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-dataview/tree/deno
[deno-readme]: https://github.com/stdlib-js/array-dataview/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/array-dataview/tree/umd
[umd-readme]: https://github.com/stdlib-js/array-dataview/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/array-dataview/tree/esm
[esm-readme]: https://github.com/stdlib-js/array-dataview/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/array-dataview/blob/main/branches.md

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

[mdn-dataview]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView

<!-- <related-links> -->

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

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

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</section>

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