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DataView

Constructor which returns a data view representing a provided array buffer.

Installation

npm install @stdlib/array-dataview

Alternatively,

To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
If you are using Deno, visit the deno branch (see README for usage intructions).
For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

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

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

Returns a DataView representing a provided array buffer.

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.

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.

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 to the start of the underlying array buffer.

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

Examples

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 ] ) );
}

Notice

This package is part of 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, see the main project repository.

Community

License

See LICENSE.

stdlib-js/array-dataview