npm install @stdlib/array-base-arraylike2object

Alternatively,

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• For use in Observable, or in browser/node environments, use theUniversal Module Definition (UMD) build available on theumd branch (seeREADME).

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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.

vararraylike2object=require('@stdlib/array-base-arraylike2object');

Converts an array-like object to an object likely to have the same "shape".

varobj=arraylike2object([1,2,3,4]);// returns {...}

• The returned object has the following properties:

  • data: reference to the input array.
  • dtype: input array data type. If unable to resolve thedata type of the input array, the property value isnull.
  • 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 array meta data to ensure that internal functions operating on arrays are provided consistent argument "shapes".

This package is part ofstdlib, 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 developstdlib, see the main projectrepository.

SeeLICENSE.

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