array-little-endian-float32

Float32Array in little-endian byte order.

https://github.com/stdlib-js/array-little-endian-float32

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Keywords

array byte-order data endian float float32 float32array ieee754 javascript little-endian node node-js nodejs single-precision stdlib structure typed typed-array types

Last synced: 4 months ago · JSON representation ·

Repository

Float32Array in little-endian byte order.

Basic Info

Host: GitHub
Owner: stdlib-js
License: apache-2.0
Language: JavaScript
Default Branch: main
Homepage: https://github.com/stdlib-js/stdlib
Size: 1.95 MB

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Stars: 1
Watchers: 2
Forks: 0
Open Issues: 0
Releases: 0

Topics

array byte-order data endian float float32 float32array ieee754 javascript little-endian node node-js nodejs single-precision stdlib structure typed typed-array types

Created about 1 year ago · Last pushed 4 months ago

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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.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

Float32ArrayLE

Typed array constructor which returns a typed array representing an array of single-precision floating-point numbers in little-endian byte order.

In contrast to the [`Float32Array`][@stdlib/array/float32] typed array constructor which stores values according to the host platform byte order, the `Float32ArrayLE` constructor always accesses elements in little-endian byte order. Such enforcement can be particularly advantageous when working with memory buffers which do not necessarily follow host platform byte order, such as [WebAssembly memory][@stdlib/wasm/memory].

## Installation ```bash npm install @stdlib/array-little-endian-float32 ``` Alternatively, - To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]). - If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions). - For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]). The [branches.md][branches-url] 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 ```javascript var Float32ArrayLE = require( '@stdlib/array-little-endian-float32' ); ``` #### Float32ArrayLE() A typed array constructor which returns a typed array representing an array of single-precision floating-point numbers in little-endian byte order. ```javascript var arr = new Float32ArrayLE(); // returns ``` #### Float32ArrayLE( length ) Returns a typed array having a specified length. ```javascript var arr = new Float32ArrayLE( 5 ); // returns ``` #### Float32ArrayLE( typedarray ) Creates a typed array from another typed array. ```javascript var Float32Array = require( '@stdlib/array-float32' ); var arr1 = new Float32Array( [ 0.5, 0.5, 0.5 ] ); var arr2 = new Float32ArrayLE( arr1 ); // returns var v = arr2.get( 0 ); // returns 0.5 ``` #### Float32ArrayLE( obj ) Creates a typed array from an array-like object or iterable. ```javascript var arr = new Float32ArrayLE( [ 0.5, 0.5, 0.5 ] ); // returns var v = arr.get( 0 ); // returns 0.5 ``` #### Float32ArrayLE( buffer\[, byteOffset\[, length]] ) Returns a typed array view of an [`ArrayBuffer`][@stdlib/array/buffer]. ```javascript var ArrayBuffer = require( '@stdlib/array-buffer' ); var buf = new ArrayBuffer( 32 ); var arr = new Float32ArrayLE( buf, 0, 4 ); // returns ``` * * * ### Properties #### Float32ArrayLE.BYTES_PER_ELEMENT Number of bytes per view element. ```javascript var nbytes = Float32ArrayLE.BYTES_PER_ELEMENT; // returns 4 ``` #### Float32ArrayLE.name Typed array constructor name. ```javascript var str = Float32ArrayLE.name; // returns 'Float32ArrayLE' ``` #### Float32ArrayLE.prototype.buffer **Read-only** property which returns the [`ArrayBuffer`][@stdlib/array/buffer] referenced by the typed array. ```javascript var arr = new Float32ArrayLE( 5 ); var buf = arr.buffer; // returns ``` #### Float32ArrayLE.prototype.byteLength **Read-only** property which returns the length (in bytes) of the typed array. ```javascript var arr = new Float32ArrayLE( 5 ); var byteLength = arr.byteLength; // returns 20 ``` #### Float32ArrayLE.prototype.byteOffset **Read-only** property which returns the offset (in bytes) of the typed array from the start of its [`ArrayBuffer`][@stdlib/array/buffer]. ```javascript var arr = new Float32ArrayLE( 5 ); var byteOffset = arr.byteOffset; // returns 0 ``` #### Float32ArrayLE.prototype.BYTES_PER_ELEMENT Number of bytes per view element. ```javascript var arr = new Float32ArrayLE( 5 ); var nbytes = arr.BYTES_PER_ELEMENT; // returns 4 ``` #### Float32ArrayLE.prototype.length **Read-only** property which returns the number of view elements. ```javascript var arr = new Float32ArrayLE( 5 ); var len = arr.length; // returns 5 ``` * * * ### Methods #### Float32ArrayLE.from( src\[, map\[, thisArg]] ) Creates a new typed array from an array-like object or an iterable. ```javascript var arr = Float32ArrayLE.from( [ 1.0, -1.0 ] ); // returns var v = arr.get( 0 ); // returns 1.0 ``` To invoke a function for each `src` value, provide a callback function. ```javascript function mapFcn( v ) { return v * 2.0; } var arr = Float32ArrayLE.from( [ 1.0, -1.0 ], mapFcn ); // returns var v = arr.get( 0 ); // returns 2.0 ``` A callback function is provided two arguments: - **value**: source value. - **index**: source index. To set the callback execution context, provide a `thisArg`. ```javascript function mapFcn( v ) { this.count += 1; return v * 2.0; } var ctx = { 'count': 0 }; var arr = Float32ArrayLE.from( [ 1.0, -1.0 ], mapFcn, ctx ); // returns var v = arr.get( 0 ); // returns 2.0 var n = ctx.count; // returns 2 ``` #### Float32ArrayLE.of( element0\[, element1\[, ...elementN]] ) Creates a new typed array from a variable number of arguments. ```javascript var arr = Float32ArrayLE.of( 1.0, -1.0 ); // returns var v = arr.get( 0 ); // returns 1.0 ``` #### Float32ArrayLE.prototype.get( i ) Returns an array element located at a nonnegative integer position (index) `i`. ```javascript var arr = new Float32ArrayLE( 10 ); // Set the first element: arr.set( 1.0, 0 ); // Get the first element: var v = arr.get( 0 ); // returns 1.0 ``` If provided an out-of-bounds index, the method returns `undefined`. ```javascript var arr = new Float32ArrayLE( 10 ); var v = arr.get( 100 ); // returns undefined ``` #### Float32ArrayLE.prototype.set( arr\[, offset] ) Sets array elements. ```javascript var arr = new Float32ArrayLE( [ 1.0, 2.0, 3.0 ] ); // returns var v = arr.get( 0 ); // returns 1.0 v = arr.get( 1 ); // returns 2.0 // Set the first two array elements: arr.set( [ 4.0, 5.0 ] ); v = arr.get( 0 ); // returns 4.0 v = arr.get( 1 ); // returns 5.0 ``` By default, the method starts writing values at the first array index. To specify an alternative index, provide an index `offset`. ```javascript var arr = new Float32ArrayLE( [ 1.0, 2.0, 3.0 ] ); // returns // Set the last two array elements: arr.set( [ 4.0, 5.0 ], 1 ); var v = arr.get( 1 ); // returns 4.0 v = arr.get( 2 ); // returns 5.0 ``` A few notes: - If `i` is out-of-bounds, the method throws an error. - If a target array cannot accommodate all values (i.e., the length of source array plus `i` exceeds the target array length), the method throws an error. - If provided a typed array which shares an [`ArrayBuffer`][@stdlib/array/buffer] with the target array, the method will intelligently copy the source range to the destination range. #### Float32ArrayLE.prototype.toString() Serializes an array as a string. ```javascript var arr = new Float32ArrayLE( [ 1.0, 2.0, 3.0 ] ); var str = arr.toString(); // returns '1,2,3' ```

* * * ## Notes - While a `Float32ArrayLE` _strives_ to maintain (but does not **guarantee**) consistency with [typed arrays][@stdlib/array/typed], significant deviations from ECMAScript-defined [typed array][@stdlib/array/typed] behavior are as follows: - The constructor does **not** require the `new` operator. - Accessing array elements using bracket syntax (e.g., `X[i]`) is **not** supported. Instead, one **must** use the `.get()` method.

* * * ## Examples ```javascript var Float32Array = require( '@stdlib/array-float32' ); var logEach = require( '@stdlib/console-log-each' ); var Float32ArrayLE = require( '@stdlib/array-little-endian-float32' ); // Create a typed array by specifying a length: var out = new Float32ArrayLE( 3 ); logEach( '%s', out ); // Create a typed array from an array: var arr = [ 1.0, -1.0, -3.14, 3.14, 0.5, 0.5 ]; out = new Float32ArrayLE( arr ); logEach( '%s', out ); // Create a typed array from an array buffer: arr = new Float32Array( [ 1.0, -1.0, -3.14, 3.14, 0.5, 0.5 ] ); // host byte order out = new Float32ArrayLE( arr.buffer ); logEach( '%s', out ); // Create a typed array from an array buffer view: arr = new Float32Array( [ 1.0, -1.0, -3.14, 3.14, 0.5, 0.5 ] ); // host byte order out = new Float32ArrayLE( arr.buffer, 8, 2 ); logEach( '%s', out ); ```

* * * ## 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 © 2016-2025. The Stdlib [Authors][stdlib-authors].

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Login: stdlib-js
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Website: https://stdlib.io
Twitter: stdlibjs
Repositories: 3,692
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Standard library for JavaScript.

Citation (CITATION.cff)

cff-version: 1.2.0
title: stdlib
message: >-
  If you use this software, please cite it using the
  metadata from this file.

type: software

authors:
  - name: The Stdlib Authors
    url: https://github.com/stdlib-js/stdlib/graphs/contributors

repository-code: https://github.com/stdlib-js/stdlib
url: https://stdlib.io

abstract: |
  Standard library for JavaScript and Node.js.

keywords:
  - JavaScript
  - Node.js
  - TypeScript
  - standard library
  - scientific computing
  - numerical computing
  - statistical computing

license: Apache-2.0 AND BSL-1.0

date-released: 2016

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@stdlib/array-buffer ^0.2.2 development
@stdlib/array-float32 ^0.2.2 development
@stdlib/array-zero-to ^0.2.2 development
@stdlib/assert-is-arraybuffer ^0.2.2 development
@stdlib/assert-is-nonnegative-integer ^0.2.2 development
@stdlib/assert-is-number ^0.2.2 development
@stdlib/bench-harness ^0.2.2 development
@stdlib/console-log-each ^0.2.2 development
@stdlib/math-base-special-pow ^0.3.0 development
@stdlib/random-array-randu ^0.2.1 development
@stdlib/symbol-iterator ^0.2.2 development
istanbul ^0.4.1 development
tap-min git+https://github.com/Planeshifter/tap-min.git development
tape git+https://github.com/kgryte/tape.git#fix/globby development
@stdlib/array-little-endian-factory github:stdlib-js/array-little-endian-factory#main

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