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strided2object

Convert a strided array and associated metadata to an object likely to have the same "shape".

Installation

npm install @stdlib/strided-base-strided2object

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 strided2object = require( '@stdlib/strided-base-strided2object' );

strided2object( N, x, stride, offset )

Converts a strided array and associated metadata to an object likely to have the same "shape".

var obj = strided2object( 4, [ 1, 2, 3, 4 ], 1, 0 );
// returns {...}

Notes

• The returned object has the following properties:

  • data: reference to the input array.
  • dtype: input array data type. If unable to resolve the data type of the input array, the property value is null.
  • length: number of indexed elements.
  • stride: index increment.
  • offset: starting index.
  • accessorProtocol: boolean indicating whether the input uses accessors for getting and setting elements.
  • accessors: a two-element array whose first element is an accessor for retrieving an array element (i.e., a getter) and whose second element is an accessor for setting an array element (i.e., a setter).

• The getter accessor accepts two arguments:

  • data: input array.
  • idx: element index.

• The setter accessor accepts three arguments:

  • data: input array.
  • idx: element index.
  • value: value to set.

• This function is intended as a potential performance optimization. In V8, for example, even if two objects share common properties, if those properties were added in different orders or if one object has additional properties not shared by the other object, then those objects will have different "hidden" classes. If a function is provided many objects having different "shapes", some JavaScript VMs (e.g., V8) will consider the function "megamorphic" and fail to perform various runtime optimizations. Accordingly, the intent of this function is to standardize the "shape" of the object holding strided array metadata to ensure that internal functions operating on strided arrays are provided consistent argument "shapes".

Examples

var Complex64Array = require( '@stdlib/array-complex64' );
var strided2object = require( '@stdlib/strided-base-strided2object' );

// Create an array:
var x = new Complex64Array( 10 );

// Convert to a standardized object:
var obj = strided2object( x.length, x, 1, 0 );
// returns {...}

console.log( obj );

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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

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.