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Allocate a buffer from an ArrayBuffer.
import arraybuffer2buffer from 'https://cdn.jsdelivr.net/gh/stdlib-js/buffer-from-arraybuffer@esm/index.mjs';Allocates a buffer from an ArrayBuffer.
import ArrayBuffer from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-buffer@esm/index.mjs';
var ab = new ArrayBuffer( 10 );
var buf = arraybuffer2buffer( ab );
// returns <Buffer>By default, the function allocates a buffer starting from the first byte of the provided ArrayBuffer. To specify an alternative starting index, provide a byteOffset.
import ArrayBuffer from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-buffer@esm/index.mjs';
var ab = new ArrayBuffer( 10 );
var buf = arraybuffer2buffer( ab, 2 );
// returns <Buffer>
var len = buf.length;
// returns 8By default, the function allocates a buffer until the end of the provided ArrayBuffer. To allocate a specified number of ArrayBuffer bytes, provide a length.
import ArrayBuffer from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-buffer@esm/index.mjs';
var ab = new ArrayBuffer( 10 );
var buf = arraybuffer2buffer( ab, 2, 4 );
// returns <Buffer>
var len = buf.length;
// returns 4The behavior of this function varies across Node.js versions due to changes in the underlying Node.js APIs:
<3.0.0: the function copiesArrayBufferbytes to a newBufferinstance.>=3.0.0and<5.10.0: if provided abyteOffset, the function copiesArrayBufferbytes to a newBufferinstance; otherwise, the function returns a view of anArrayBufferwithout copying the underlying memory.<6.0.0: if provided an emptyArrayBuffer, the function returns an emptyBufferwhich is not anArrayBufferview.>=6.0.0: the function returns a view of anArrayBufferwithout copying the underlying memory.
<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">
import ArrayBuffer from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-buffer@esm/index.mjs';
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
import randu from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-base-randu@esm/index.mjs';
import IS_LITTLE_ENDIAN from 'https://cdn.jsdelivr.net/gh/stdlib-js/assert-is-little-endian@esm/index.mjs';
import arraybuffer2buffer from 'https://cdn.jsdelivr.net/gh/stdlib-js/buffer-from-arraybuffer@esm/index.mjs';
var high;
var view;
var low;
var buf;
var ab;
var i;
// Allocate an ArrayBuffer:
ab = new ArrayBuffer( 64 );
// Create a Float64 view and set random values:
view = new Float64Array( ab );
for ( i = 0; i < view.length; i++ ) {
view[ i ] = randu();
}
// Create a new buffer from the ArrayBuffer:
buf = arraybuffer2buffer( ab );
// Read the high and low words for each double:
for ( i = 0; i < view.length; i++ ) {
if ( IS_LITTLE_ENDIAN ) {
high = buf.readUInt32LE( (8*i)+4 );
low = buf.readUInt32LE( 8*i );
} else {
high = buf.readUInt32BE( 8*i );
low = buf.readUInt32BE( (8*i)+4 );
}
console.log( 'Value: %d. High: %d. Low: %d.', view[ i ], high, low );
}
</script>
</body>
</html>@stdlib/buffer-ctor: Buffer.@stdlib/buffer-from-array: allocate a buffer using an octet array.@stdlib/buffer-from-buffer: copy buffer data to a new Buffer instance.@stdlib/buffer-from-string: allocate a buffer containing a provided string.
This package is part of stdlib, a standard library 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.
See LICENSE.
Copyright © 2016-2025. The Stdlib Authors.
